bluuebunny/crossref_metadata_2025 huggingface dataset:
The Spatial Distribution Characteristics of Seismic Induced Geo-Hazards and Ground Damage Classification in Baisha River
Authors: Meng Hua Jun , Qiao Jian Ping
Published: November 2012

The Baisha river basin was extremely destroyed by the Wenchuan earthquake. This paper extracted the seismic-induced geological disasters data about 26km2 within an area of 368.25km2 by remote sensing interpretation and field investigation. This paper used arcgis to analysis these data, and divided the basin into several belts or zones base on slope, aspect, elevation and stratum lithology. The geo-hazard distribution analysis model was built to find some correlation between disaster distribution and geological factors such as terrain, stratum lithology and geomorphology by comparing among the parameters Ps, Ph, and Pc. The results show that most hazards occur where the slope between 30° and 50°, or aspect range is112.5° to 202.5°, and or the elevation between1140m and 3140m, the stratum lithology are the Huangshuihe group and The Middle Proterozoic common granite. At last the research zone is classified into four levels base on ground destroyed grade, and results show that the belts of most hazards located are not always the one destroyed most heavily.
Research about Efficiency of Seismic Mitigation for the Dry Friction Plate-Spring Reverted System in High-Rise Building
Authors: Ge Nan , Chen Hai Bin , Hao Jing Shi
Published: November 2012

A theoretical analyzing approach about a novel tuned mass damper system, on high-rise building, was derived according to Lagrange Equation. The solution was programmed with MTALAB software based on the Longe-Kuta method. Computation results show that the displacement, the velocity, and the moment of the highest point were significantly decreased with this system. The system will exhibit the best efficiency with he slip friction factor being 0.01, the spring coefficient 10000KN/m,the damping coefficient 100000 KN/m s and the tuned mass 1.0 times of the mass of per length of the structure.
Influence of Matric Suction on the Stability of Unsaturated Slope
Authors: Hu Xiang Hui , Cheng Sheng Guo , Yu Zhi Wei
Published: November 2012

Matric suction plays a significant role in the unsaturated slope stability and receives a rising interest in how matric suction affects the unsaturated slope stability. According to the shear strength theories and soil-water characteristic curve of unsaturated soils，matric suction parameters were proposed to study the influences of matric suction on unsaturated slope stability by applying in strain-softening constitutive model and using catastrophe theory as a tool. The results show that the unsaturated slope safety factor depends on the stiffness ratio，the softening coefficient，the suction sensitive factor and the relative displacement ratio. However，when the system reaches the limit equilibrium circumstance，the fundamental factors particularly affecting the unsaturated slope stability are the stiffness ratio of two media and the softening coefficient of the sliding surface，and the further trend between matrix suction and unsaturated slope stability is the same as the changes of the suction impact factor.
Development Law of Seismic Subsidence of Loess through In Situ Explosion Test
Authors: Wang Qiang , Sun Jun Jie , Wang Lan Min
Published: November 2012

To reveal development law of seismic subsidence of loess, through in-situ explosion test at one loess site, ground settlement and layered underground settlement were monitored, by which the time-space-domain development of seismic subsidence of loess are gained. Furthermore, the time-domain development law of seismic subsidence in different directions is analyzed, so as the variation characteristics of layer-settlement and its contribution rate, and the development law of seismic subsidence distribution in the horizontal direction. The time-domain development of seismic subsidence of loess consists of rapidly growing stage and slowly growing stage. The former is under blasting ground motion, and its seismic subsidence ratio approaches to 46.5% invariably. While in the later stage, development of seismic subsidence ratio can be described by power function with index of 0-1. And, seismic subsidence distribution and contribution rate of layer-settlement are varying with time, which are consistent to the time-domain development law of seismic subsidence.
Study on Seismic Reinforcement Measure of Mountain Tunnel Cavity
Authors: Deng Tao , Zhang Shi Ling , Yao Jin Mei
Published: November 2012

Based on the diseases disposal project of Longmen Tunnel in the Fujian provincial road 206, the seismic reinforcement measure of mountain tunnel cavity was studied in this paper. The seismic stability of the mountain tunnel to deal with the cavity behind the lining was calculated and analyzed under the two common disease reinforcement measures, by using a 3-D finite difference method. And the optimal reinforcement scheme also had been determined. The results show that mortar bolt and cover arch can change the maximum principal stress spectral characteristics of surrounding rock, which is beneficial to the seismic resistance. And the results also show that mortar bolt has slightly effect on the bending moment stress of lining.
Testing Study on the Change Law about Internal Friction Angle of Geogrid Reinforced Clay under many Times Freezing-Thawing Cycles
Authors: Zhao Rong Fei , Mi Yong Ning , Gao Wei
Published: November 2012

This paper uses quadric orthogonal rotating combination design test, obtains the internal friction angle change values under given many times freezing-thawing cycles for the geogrid reinforced clay with different degree of compactions, moisture contents and reinforcement spacings. Through analysis of the test data and mathematical calculation to get the regression equation about the internal friction angle change value related with fillers compaction degree, initial moisture content and reinforcement spacing, and test the conspicuousness about the equation and the influence factors. Applies the equation to calculate the internal friction angle change values in the else test conditions, the results show that the calculated values and the testing data fit well, the equation can be used for initial calculation of the under many times freezing-thawing cycles. The regression equation provides a theoretical reference for the engineering practice of geogrid reinforced clay.
Flood Influence Evaluation of Xiazhu Village Construction Land in Wuqing District in Tianjin City
Authors: Yu Ping , Feng Ping , Sun Shu Hong
Published: November 2012

Investigate on the information of river basin and river way in Dianbei Provisional Detention Basin, use the Preissmann four point implicit difference scheme for the discrete solution of Saint Venant equation, and establish the mathematical model of flood routing for hydraulic. Analyze and evaluate the backwater of construction in Dianbei Provisional Detention Basin, and the Yongding River flood control criteria are combined. The result indicates that water level caused by the implementation of construction project is very small, and the influence to flood control in flood detention area and the adjacent area is very limited, so the project will not affect the flood release in detention basin.
Design and Application of Concrete Faced Rock-Fill Dam Numerical Simulation Analysis Program
Authors: Li Hong Ru , Feng Fei , Wang Qing
Published: November 2012

Reviewed the various constitutive mode of concrete faced rock-fill dam. Basis on the complex physical characteristic of filled the material and the framework of dam, a method of computer is given, introduced into the program of the concrete face rock-fill dam calculation with FORTRAN language on the ANSYS software. It is used to simulate two and three-dimensional nonlinear computation and compute figure simulation in the construction procedure and operation period for the concrete face rock fill dam, the result was intuitionist clarity.
The Influence of Turbulence Model Selection and Leakage Considerations on CFD Simulation Results for a Centrifugal Pump
Authors: Liu Han , Pan Hua Chen
Published: November 2012

A commercial CFD software was used to simulate and predict a centrifugal pump performance. In this paper，the influences on the numerical simulation results using different turbulence models and different leakage flow assumptions were studied. The simulations are based on RANS with the and SST turbulence models. It is found that SST turbulence is better. Also the influence of the leakage flow was studied.
Study on the Gray Fuzzy Comprehensive Evaluation Model about Dam-Break Consequences
Authors: Wang Xiao Ling , Wang Qing Song , Sun Rui Rui , Ao Xue Fei
Published: November 2012

The comprehensive evaluation of the dam-break consequences is an issue of crucial importance for defending natural disasters, protecting socio-economic and sustaining ecological development. The consequences of dam-break were analyzed, including life loss, economic loss and the social and environmental influence. The loss of life evaluation based on the improved Graham method was introduced. Depth, velocity and other hydraulic parameters of dam-break flood were obtained by the three-dimensional numerical simulation, which has proved to be a useful tool for dam-break consequences. AHP method was adopted to measure the weight of each factor. Grey fuzzy comprehensive evaluation of dam-break consequences was proposed. QING LINJING reservoir in Shenzhen was taken as a case. The results show that it will cause serious incidents once QING LINJING reservoir dam breaks.
The Analytical Solution of Hydrodynamic Pressure of Full Water Tunnel in the Horizontal Excitation
Authors: Liu Jin Yun , Sun Sheng Nan
Published: November 2012

As the great western development, the earthquake resistance analysis of the large project of water had become increasingly important. The paper derived analytical solution of hydrodynamic pressure of circular water-conveyance tunnel for full water in a horizontal incentive of the earthquake action using the coupling vibration theory of elastomer and fluid potential and shallow water wave theory. Hereinto, the inner water was especially incompressible water. For full water water-conveyance tunnel, in horizontal excitation, found only the rigid motion potential, the hydraulic pressure of unbalanced force produced not exist, also the liquid sloshing did not exist; the hydrodynamic pressure of the left or right side the lining was the largest, the hydrodynamic pressure of the up or down of the lining was the smallest. The analytical solution of hydrodynamic pressure provides a theoretic basis for the finite element analysis, experimental study and real seismic observation, and provided the beneficial reference value for practical engineering design and construction.
Optimal Model for HVAC Based on System Energy Input Ratio
Authors: Qing Ma , Hao Wu
Published: November 2012

According to the problem that the components of HVAC system have the strong coupling and the low energy efficiency, a kind of optimal model for HVAC based on system energy input ratio (SEIR) is proposed. Firstly, according to each equipment characteristic, the performance curve model of each equipment power is built. Based on these models, the performance curve model of system energy consumption is built too. Then, basing on energy conservation constraint, each equipment performance constraint and coupling constraint, the constraint equation is built. Finally, simplifying the model parameter, taking the least energy input ratio as an objective function, the optimal set point model of various equipments is built. The experimental results indicate that compared with the least energy consumption optimal method, the model has better energy saving effect.
Lanzhou City Sewage Heat Utilization Measurement Analysis
Authors: Zhang Jian , Wang Man Li
Published: November 2012

According to the actual operation of the pick sewage-source heat pump system established by the equivalent of heating, refrigerating capacity sewage equation of lanzhou city sewage contain energy are calculated.
Consolidation Properties of Dredger Fill over Liquid Limit under Different Back Pressure Levels
Authors: Shen Yang , Fei Zhon Qiu
Published: November 2012

Primary and secondary consolidation concur in the primary consolidation stage. Especially for the dredger fill with high moisture content, the coupling effect of primary and secondary consolidation was very obvious. Analysis on the secondary consolidation properties during primary consolidation is great significant to reveal the consolidation mechanism and identify the settlement calculation method. Therefore one dimensional consolidation tests were conducted with the dredger fill clay of Wenzhou over liquid limit. The tests were focused on the influence of different vertical loading and back pressure condition on soil’s secondary consolidation properties. The research showed that the secondary consolidation of dredger fill of in high moisture content was very obvious under the primary consolidation stage. The final consolidation pressure level was higher, the vertical deformation was larger at the same effective stress level. Through the consolidation tests with different back pressure levels, it further verified high pore pressure potential promoted the development of secondary consolidation. Further more, when the final consolidation pressure was a constant value, the total settlement of primary and secondary consolidation basically unchanged. So high pore pressure promoted the occurrence of secondary consolidation, but reduced and sped up the development of primary consolidation.
The Research of Building Air Permeability Based on Building Structural Tightness
Authors: Cao Shuanghua , Lou Zhiliang , Wang Leheng , Li Minsi
Published: November 2012

The building air permeability plays a major role in both building energy performance and indoor air quality. The performance of structural tightness is set as an evaluation index of building air permeability, which is employed to analyze the relationship among building air permeability, building construction and window/door air permeability. Based on some assumptions, the coefficient of building structural tightness is established to summarize the influential factors on building air permeability, and the theory method is provided to improve the building air permeability. A model of air permeability for a small room is taken as an example. The results indicate that the building structural tightness coefficient is available to analyze the building air permeability.
Test and Analysis on Thermal Environment of Commercial Kitchen in China
Authors: Hou Xiao Tan , Wang Zhi Hua , Li An Gui
Published: November 2012

This study intends to investigate indoor air quality of kitchen such as velocity, temperature, humidity and air contaminant (carbon monoxide and carbon dioxide). Test results show that workspace local temperature is up to 49.6°C at 12:50 due to the workload increased at the diner peak and the largest CO and CO2concentration were 14.8 ppm and 2145 ppm respectively after 2 hours cooking, which are above the acceptance criteria (CO<10ppm and CO2<1000ppm), and it gives serious impact on the staff's physical health. It is necessary to improve indoor air quality through kitchen ventilation.
Test on Characteristics of the High-Pressure Secondary Rotary Water Gas Jet Ventilation
Authors: Ma Zhong Fei , Jin Peng Gang , Zhao Feng
Published: November 2012

In order to reduce the concentration of explosive gas, experimental research was carried out on the high pressure secondary rotating water jet ventilation characteristic, and the principle of high pressure secondary rotating water jet ventilation was analyzed. Experiments of the relationship between pressure and the suction air flow characteristics were carried out with different structure of jet pipe, different structure of nozzles, different throat in high pressure single rotating water jet ventilation, and the secondary rotating ventilation characteristic were tested with different guide vane angle. The results show that the air-sucking quantity approximatively increased with water pressure in accordance with parabola in the high press secondary rotating water jet ventilator, the air-sucking quantity of different structure of jet pipe was not same, the air-sucking quantity was significantly greater than that of swirl nozzle, the secondary rotary ventilation acts on the larger range.
The Experimental Investigation of GBE-050 Safety Netting System
Authors: Cheng Pei Feng , Yan Shu Yin , Cui Gao Hang
Published: November 2012

Abstract. Rock slope often happen various geological hazards, so the slope protection is very important .The paper introduces composition, working principle and advantages of safety netting system, and general situation of GBE-050 briefly. We have done rockfall test on the slope selected to GBE-050 passive protection system and used formula to calculate energy that impact flexible net from the point of A. Safety netting system has very high application value and widely used in various engineering.
A Study on the Occurrence Law of Coal Seam Gas in Shanxi
Authors: Xue Guang Wu , Liu Hong Fu , Guo Jing Lin
Published: November 2012

The thickness of overlaying bedrock is the main control factor of preservation, in addition, magmatic activities, different structural types and hydrogeological conditions are also control factors. Regional magmatic thermometamorphism appeared as a kind of superimposed effect on the background of deep metamorphism. Two Eastwest （EW）metamorphic belts in Shanxi tallied with the distribution of magmatic rock masses, resulting in coal seam gas exploitation and utilization bases of Yangquan and Jincheng mining areas. From gas-accumulation structural setting, closed type structures make high gas content in coal reservoir such as Qinnan, Gujiao, Xingjiashe, Dongshe areas in the Qinshui Basin, Shilou, Daning-Jixian and Sanjiao-Liulin areas in the Hedong Basin, gas content is 10-15 m³/t or even higher. There are convenient channels for coal seam gas effusion in the open structures; with lower gas content, such as Lishi mining area in Hedong Basin, Huoxi structural area in Qinshui Basin, Hunyuan, and Wutai coal districts.
Full-Scale Experimental and Numerical Simulation of Fire in a High-Rise Residential Building
Authors: Yang Jun Tao , Yang Yun , Liang Jing
Published: November 2012

Fires in high-rise residential building were studied experimentally by using an actual building with similar inner structure. The temperatures in the building interior corridors, elevators and staircases exit were measured. At the same time the fires in this construction were simulated by using FDS (Fire Dynamics Simulator) software, the variance trends of the temperatures in different positions within high-rise residential building were studied and compared with the experiment results, and the results of this simulation are proved to be valid. The results can be used to support the study of effectively controlling of the smoke spread and evacuation in high-rise residential building.
Research on the Sensitivity of Rock Slope Stability to the Effect Factors under Blasting Disturbance
Authors: Chen Ping , Chen Ming , Kong Jian , Liu Yu
Published: November 2012

The rock slope stability under blasting excavation disturbance is an important study content in the fields of hydropower, mining, transportation and other research field. Basing on a potential slip rock mass of the left slope of Jinping-Ⅰ Hydropower Station, using Sarma method of the limit equilibrium analysis and orthogonal experimental design, the paper analyzed the main factors which affect the slope stability, and studied the sensibilities of the slope stability to various factors under blasting disturbance. The results indicate that the slope stability under blasting disturb is very sensitive to the change of internal correlative of potential slip rock mass. The slope stability under blasting disturb is less sensitive to the change of external correlative factors which are result from the blasting.
The Affecting Factors of Soil-Reinforcement by Plant Roots
Authors: Xia Zhen Yao , Xiao Wen , Fang Yan , Wen Yan Bin
Published: November 2012

Now, with the large-scale of various projects constructed, a lot of the original vegetation were destroyed and formed a large area of bare slope. The existence of slopes increased the occurrent intensity of soil erosion, landslides and debris flow, and also caused local ecological disasters of the deterioration of the microclimate and the destruction of the biological chain. Based on this situation, this article discussed the reinforced soil reinforcement of shallow fine roots and deep rough roots, and generalized comprehensively the root factors on the impact of the reinforced soil, and explored the lack of research and development trends of vegetation slope protection.
Establishment of Virtual Campus Based on ArcGIS
Authors: Sa Chu La , Liu Gui Xiang , Wang Mu Lan
Published: November 2012

The study that based on the topography map of Saihan campus , the Inner Mongolia normal university in 2003 , and combined with Sketchup each function , make Saihan campus become virtual three-dimensional simulate campus .
A Map Matching Algorithm Based on Curvature and Slope
Authors: Wu Wei Ying , Kang Chuan Li
Published: November 2012

In vehicle navigation system, path matching often go wrong when road condition is complex, especially there are island ring, or exit and entrance of highway. This lead to wrong map display and wrong route guidance, thus system give a bad impact to driver. In order to solve this problem, this paper includes a map matching algorithm based on curvature and slope. This Algorithm coding has been realized by c and proved its availability at last.
Stability Analysis Method to Underground Goafs in Opencast Mining Based on FEM
Authors: Li Fa Ben , Lu Cai Wu , Li Ying Feng
Published: November 2012

The 3D model of terrain, which includes goafs, is built by use of terrain generator from MIDAS GTS. The method is developed that the model is stress analyzed by FEM (finite-element method). The following cases are considered: rock weight, loose rock and Heavy Equipment on step surface. Finally, used to the field datum from Luo’yang Molybdenum Co., Ltd., modeling and stress analyzing are finished by the software of MIDAS GTS. The result indicates that the method could provide scientific basis for Safety and Management to open-pit with Underground mined-out area.
The Coupling Model of Wellbore Conduit Flow, Throttled Flow and Formation Seepage in Water Injection Wells
Authors: Liu Bao Jun , Shi Hai Xia , Cai Yun Sheng
Published: November 2012

Separate layer water flooding is adopted in most oilfields in China and the injection flow rate is controlled by the diameter of water nozzle of each layer. In order to ensure the effect of water injection, applicable water nozzles need to be adjusted to meet the requirements of injection flow rate. The adjustment is commonly realized according to experience, which leads to long adjustment time and low efficiency. To solve this problem, the coupling model of wellbore conduit flow, throttled flow and formation seepage was established based on theoretical analysis, which could provide theoretical basis for water nozzles adjustment. In the model, the Bernoulli Equation was adopted to analyze wellbore conduit flow; indoor experiments were done to research throttled flow; the research object of the seepage was finite radius well in homogeneous infinite formation.
Oil-Water Two Phase Flow Model Considering Threshold Pressure Gradient
Authors: Liu Yi Kun , Liang Shuang , Wan Xin , Xuan Yang
Published: November 2012

Base on the non-Darcy flow problem in low permeability reservoirs, the oil-water two phase radial fluid flow model considering threshold pressure gradient is established, the output and formation pressure distribution formulas are obtained，the production variation rule and the influence threshold pressure gradient on formation pressure distribution of different permeability and different well spacing are discussed, the reasonable well spacing of different threshold pressure gradient is calculated. Research shows that, the smaller the permeability, the bigger the corresponding threshold pressure gradient, the faster the production shortfall; in the same permeability, the greater the well spacing, the less the output; the fluid flow requires energy expenditure to overcome threshold pressure gradient, the smaller the permeability, the greater the resistance, the faster the formation pressure descent near wellbore. The reasonable well spacing for effective production is obtained by output formula, which provides the scientific foundation for improving the development effects.
Mesh Moving Scheme Based on Solving the Laplace Equation with Jacobian Stiffening Technique
Authors: Wang Hua Kun , Yu Guo Liang
Published: November 2012

Mesh moving scheme is an important issue in many fluid-structure interaction problems. In this paper a new mesh motion technique is presented for the effective treatment of moving mesh. The entire deformation is imposed at each time step and the motion of the internal nodes is governed by a modified Laplace equation. Finite element method is adopted to solve the Laplace equation with elemental Jacobian-based stiffening technique. Nodal coordinates are updated by using the total nodal displacements and initial coordinates. The proposed scheme has been applied to several 2D and 3D test cases involving various mesh types with the mesh quality evaluated by an index called elemental aspect ratio. With these applications, it is demonstrated that the present method still preserves good mesh quality for long-term and large amplitude oscillations or deformations.
Research on Coupling of Seepage and Stress Fields with Variable Modulus of Elasticity
Authors: Sun Xu Shu , Li Jian Lin , Zhou Shi , Bai Jun Lei
Published: November 2012

According to the characteristics that permeability and elastic modulus vary with stress, the variation of elastic modulus of sandstone change with confining pressure was researched through the triaxial test. And combined with empirical formula proposed by Louis (1967), mathematical model of coupling of seepage and stress fields is established. This study shows that: the groundwater has a relatively great effect on rock stress and deformation and is adverse to the slope stability. The elastic modulus that chang with confining pressure influences a lot on rock deformation, meanwhile, the variation of rock stress changes permeability, therefore groundwater is the main influencing factors.
Nonlinear Analysis of Foundation Settlement by Modified Secant Modulus Method
Authors: Li Ren Ping
Published: November 2012

A new technique namely modified secant modulus method（MSMM）considering time factor for nonlinear settlement computation of foundation is proposed. The principle of MSMM is using correction technique of reverse solution to solve modified secant modulus (MSM) of subsoil under different additional stress level with load-settlement test data, and the additional stress is solved with Boussinesq elasticity theory, then layer wise summation method is adopt to calculate the total settlement of foundation. The loading test results of footings performed by Briaud and Gibbens (1993) on sand foundation are analyzed with MSMM. Normalized settlement curves over width versus pressure for all footings can be obtained in normalization processing, and the calculation curve agrees well with the normalization curves. The loads of Q25 and Q150 corresponding to the settlements of 25mm and 150mm respectively of different size footings are calculated and the errors of them are within 10% compared with testing results, and the creep exponents of 3m south and north footing for 30 minutes load test were 0.036 and 0.030, then the calculated total settlement in 2014 (20 years later) will be 39.6 and 36.7mm respectively.
Discuss on down-Hole Intelligent Intermittent Pumping Technology in Low Liquid Production Well
Authors: Shen Bao Ming , Qi Di , Chi Hong Tao , Ma Li Qiang , Liu Xian Ku , Qiao Hui Ping , Shen Jia Fu , Zhu Jun Qiong
Published: November 2012

Because of its matured lifting technology and perfect supporting process, beam unit-rod pumping is applied widely in oilfield development. But as applied in low liquid production wells, the proportion of idle power consumption is large. Therefore, the lifting technology of electric submersible piston pump was studied to decrease the energy consumption. Based on the supporting technologies of electrical heating, liquid level automatic monitoring and remote control, the technology of down-hole intelligent intermittent pumping was developed, which can decrease the energy consumption, and provide technical support for the construction of digital oilfield.
Fracture Zonation for Overlying Strata in Underground Mining of Shallow Coal Seam
Authors: Fan Gang Wei , Zhang Dong Sheng , Zhou Lei
Published: November 2012

Overburden fractures are the passageways for water resource loss in underground mining. A new zonation for overburden movement was present through the analysis on hydraulic aperture and permeability according to numerical calculations. Fractured zone was divided into three parts, the upper, the middle and the lower and their heights were educed. In the bedding plane, end fracture development zone and middle fracture compaction zone were defined and their range was calculated out. The achievements can be used for water resource conservation and gas prevention or drainage, etc.
Simulation for Gas-Membrane Interaction of Folded Membrane Tubes during Inflation
Authors: Wei Jian Zheng , Ma Rui Qiang , Tan Hui Feng , Du Xing Wen
Published: November 2012

It is very important for gas-membrane interaction between compressible ideal gas and elastic membrane structure of space folded tubes during inflation deployment. This paper analyses gas flow field of the folded tube by the finite volume method, and simulates inflation process of the membrane tube with different height of the baffle. A finite volume model of gas flow field is established in the folded membrane tube, and variations of the pressure inside the membrane tube are obtained with height of the baffle and inlet flow rate. And then, the gas-membrane interaction is calculated by couple the CFD and CSD solver. The results show that the pressure on the membrane wall increases with the inflation velocity, and inlet velocity of inflation gives rise to the vibration of the membrane.
Stability Analyses of a Moving Rectangular Plate by the Element Free Galerkin Method
Authors: Wang Yan , Wang Zhong Min
Published: November 2012

The element-free Galerkin method is proposed to solve the stability of the moving rectangular plates. Utilizing the extended Hamilton’s principle for the elastic dynamics system, the variational expression of the moving thin plate are established. The dimensionless equations of motion of the moving thin plate are obtained by the element-free Galerkin method, and the complex eigenvalue equation is presented. Via numerical calculation, the variation relationship between the first three complex frequencies of the system and the moving speed is obtained. The effects of dimensionless moving speed on the stability and critical load of the thin plates are analyzed.
The Boundary Negative Slippage of Fluid Flowing in Hydrophilic Micro-Channels
Authors: Song Fu Quan , Yu Ling
Published: November 2012

In order to analyze the characteristics of the liquid flow in hydrophilic micro-channels, the negative slippage in the hydrophilic micro-channels were studied by molecular dynamics simulation and experimental research in this paper. The simulation results indicate that there exists negative slippage in the small shear rate. The absolute value of slip length decreases with the augment of shear rate and keeps constant when the shear rate increases to a certain extent. In the condition of same wettability, the slip length is only relative to shear rate of fluids near the wall rather than channel widths. At last, a experiment of deionized water flow in the micro-channel of 10 diameter was carried out. The experimental results have a good agreement with the simulation, and there exists Pseudo Threshold Pressure Gradient(PTPG) under low flow velocity. The negative slippage as the reason of existence of PTPG is analyzed in low permeability porous media
A Hybrid Finite Volume Meshless Method and its Application to Elasto-Plastic Problems
Authors: Zhang Jun Qiang
Published: November 2012

The meshless finite volume method was employed to enforce the conservation of momentum in a local weak form. A novel hybrid meshless finite volume method (HMFVM) was proposed. The displacement and the stress were interpolated independently with a hybrid scheme in the process. To enforce the compatibility between stress and displacement, a smoothing stress was introduced via finite volume method. In this way, the HMFVM can avoid the appearance of derivatives of shape functions and improve the efficiency over the orthodox meshless finite volume method. Then, the HMFVM was applied to some Elasto-plastic problems, illustrating that it enjoys high precision and efficiency. As a result, the derivatives of shape function are avoid absolutely.
Extension of Material Derivative Concept in Fluid Mechanics
Authors: Liu Fu Xiang
Published: November 2012

The original definition of material derivative is changing rate relative to the time of a physical quantity which belongs to a fluid particle. But when studying fluid mechanics problems, need in certain cases to calculate the material derivative of some quantities which don’t belong to a fluid particle, such as calculating the material derivative of base vectors of orthogonal curvilinear coordinate system. The original definition of material derivative isn’t suitable for these quantities. Calculating material derivative of these quantities is not clear in concept. To solve this problem, thorough analysis about material derivative was made according to the original definition and calculation formula of material derivative. Results found that the concept of material derivative can be extended and so can apply to any quantities which don’t belong to a fluid particle and are defined in flow fields, including vector or scalar, physical quantities or non physical quantities.
Numeric Analyses of Dynamic Crack of the Stabilizing Concrete Pile in a Sandy Slope without Underground Water
Authors: Li Rong Jian , Yan Rui , Liu Jun Ding
Published: November 2012

In order to analyze the damage mechanism of the reinforced concrete stabilizing pile, this article studies the seismic deformation of a reinforced slope without groundwater. Then, the breaking mechanism of stabilizing pile is studied by using dynamic finite element method. The results show that the slope deformation caused by the earthquake leads to the obvious increase of dynamic bending moments, and the bending moments eventually go beyond the ultimate strength moment of the reinforced concrete piles.
The Practical-Analytical Solutions of the Wind Turbine Tower System’s Natural Vibration Properties
Authors: Cao Qing , Fan Chen Yu , Wang Qing
Published: November 2012

Wind turbine tower structure system’s natural vibration properties have important effects on the system of wind power tower wind vibration and seismic response, especially the low order modes often plays a control function. How to calculate tower system vibration characteristics correctly and effectively in the design phase has important practical value. In this paper, some practical analytic solutions formulas were deduced on considering the simplified model using Rayleigh quotient method. Moreover, the results of a tower frequency and mode which were calculated by these formulas were compared with the continuous distribution parameters system’ theoretical solution and FEM method’s solutions. Analysis show that: these natural vibration properties practical analytic solutions formulas of a wind turbine tower about simplified model are useful and precision in a tower design, especially suitable for cone cube tower.
Analyzing the Influence of Road Reflection Crack on Pavement Structure under Transportation Loads through ANSYS
Authors: Li Dan Dan , Zhou Shi Sheng
Published: November 2012

This paper uses the ANSYS to set up the finite element model of the bituminous pavement after the reflection crack, through applying the transportation loads, calculating the stress of the pavement structure and the stress intensity factor, obtaining the influence of basic-level reflection crack on the pavement structure, to supply scientific evidence for the control of basic-level reflection crack and the improvement of the pavement structure.
Design and Implementation of 2-3-DimensionTransformation for Last with Rhino Developer Platform
Authors: Jin Jiang Chang , Wang Cheng
Published: November 2012

In this paper, a design of 2-3-dimension transformation for helmet with Rhino Developer Platform is presented. In the design, helmet from two-dimension to three-dimension and from three-dimension to two-dimension have been realized. After transformation the two-dimension helmet pieces and the three-dimension helmet pieces content their area, length of boundary lines and position of mesh points on helmet pieces approximately equal. This design is controlled and realized by VC++ program. At last, the visual effect of transformation is provided in Rhino Operating Platform and meanwhile its implementation is validated.
Research on Visualization of 3D Modeling of Hydropower Project Based on NURBS
Authors: Yue Pan , Miao Zheng Jian , Zhong Deng Hua
Published: November 2012

The hydropower project is generally located in the mountains or deep valleys. Due to the expansive irregular topographic form and the extremely complex geological structures, the modeling and visualization process remains technically challenging. In this paper, a NURBS surface modeling technology was applied to build a 3D geological model of the dam site region. Moreover, according to project needs, typical sections were cut to analyze the geological conditions and engineering measures were proposed. This model not only occupies small storage and has low accuracy loss, but also could be easy to operate and analyze graphics visually. The proposed method can provide a convenient, intuitive and multi-dimensional support tool for geological analysis of hydropower project.
Modal Analysis of a Simple Supported Beam Steel Bridge Based on ANSYS
Authors: Wang Dong Li , Li Tong , Wang Chun Yu
Published: November 2012

The purpose and significance of bridge health monitoring is described in this paper. In order to study bridge health monitoring, Firstly, a finite element model for simply supported steel beam is set up on the basis of the Infinite Element Theory and the software ANSYS in response to laboratory experient. Through adding instantaneous excitation to the mid-span, do modal analysis for different injury of steel bridge model to reveal the natural frequency and mode shapes of the different injury of steel bridges, identify the different injury by comparing the index value and the rate of change.
Wavelet Estimation Method for Short-Term Prediction of Deep Pit Settlement
Authors: Guo Jian , Lin Neng Hui , Yang Qi Mei
Published: November 2012

A wavelet estimation method is presented herein to estimate deep pit settlement. In this method, the pit settlement is decomposed into the trend settlement and the stochastic settlement by using Wavelet Analysis based on the characteristic of influencing factor. The model identifier is established by using artificial neural network (ANN), and trained to approximate the trend settlement. Then, the prediction controller developed could be applied for estimating the actual settlement. Finally, the verification examples show that the WIAN is an effective tool for predicting the pit settlement dynamically , high precision could be expected and achieved.
Study on the Method of Generating Digital Elevation Topographic Map in the MATLAB
Authors: Wang Ming , Yu Zhi Wei , Guo Cheng Man , Sun Cai Hong
Published: November 2012

The modern 2d digital topographic map can not meet the people to the 3d information needs.This paper analyzes the AutoCAD graphics file format.Use of MATLAB platform,designed the interface of the program based on the data extracted from DXF file,and extract valid data. Apply this method to extract terrain data of the contour to establish 3d geological model which has obtained a better effect. And solve the AutoCAD system and MATLAB data sharing between effectively.Use of the powerful graphics features of MATLAB, we have put forward a new way for 3d geological modeling and generation DEM.
Initial Prestress Optimization of Tensegrity Structures Based on Fish-Swarm Algorithm
Authors: Liu Cheng Qing , Liang Rui , Shi Wei Xing
Published: November 2012

Several force finding methods for the tensegrity structures, coupled with their limitations, are simply reviewed. Based on the equilibrium matrix theory and the judgment of structure’s geometrical stability, a new mathematical model, which considering the uniformity as well as the tension-compression condition of elements prestress, is proposed in this paper. The author write a corresponding MATLAB program by using the Fish-swarm Algorithm, and an example of multi states of self-stress tensegrity structrue is presented. The results show that the proposed mathematical optimization model can solve the force-finding problem of any multi states of self-stress tensegrity structure accurately and efficiently.
The Application of the Ground Penetrating Radar in the Inspection of Gravel Pile Composite Foundation
Authors: Zhu Chang Zhi , Zheng Xing Lian
Published: November 2012

The ground penetrating radar can be used in the inspection of the gravel pile composite foundation, and we can make a qualitative analysis of the gravel pile integrity. The technique has the advantages of rapid, accurate and real-time processing and display especially available to collect continuously high-resolution sections of underground pile. The results showed that GPR technology will provide amount of detailed and reliable information to the engineering quality inspection of composite foundation.
3D Digitalization Modeling for Visualization of Dam Construction Process
Authors: Zhao Chun Ju , Zhou Hua Wei , Zhou Yi Hong , Wang Chun Yu
Published: November 2012

It is established a visualization simulation mechanism of dam construction process at first. Then terrain contours are converted into grid mesh by contours discrete method to establish the terrain model. The 3D dam model, foundation pit, construction road are built. Then the dam model is digitalized to create the dam database. After that, all of the models are rendered by using 3DSMax, and then documents of models and materials are exported with a plugin of OgreMaxSceneExporter to assure that they can be identified by an effective graphics rendering engine--OGRE. Finally, a dam construction process visualization system for a practical case is developed, by which an interactive virtual reality environment is created for engineers and administrators.
Risk Study on Underground Construction Using Reliability Theory
Authors: Li Meng , Wang Jia Lin
Published: November 2012

Risks existing in underground construction are summarized. A parallel and series model of risk control system is established based on reliability theory. According to the required target of system reliability, combined with the reliability distribution, reliabilities of each subsystems constituting the parallels and series model can be determined. Aiming at the basic events constituting subsystems, an average distribution method was taken to solve the basic events reliabilities and an example was given. It is illustrated in the study that the reliability theory can be successfully applied in the field of underground construction and can achieve the optimization of construction safety．
Influence Analysis to Beneficial Period and Pricing of Hydraulic Project Based on Risk Allocation
Authors: Yan Bin , Zhao Qing Hua
Published: November 2012

The public department and the private investor is the commonly contractual subjects of the chartered operating project. Risk sharing idea is an important manifestation to contract justification. The public department determines the compensate degree to private investor through controlling the project’s beneficial period or the chartered operating price. Aim at part of the risk loss that the public department should undertake after risk events had happened; two flexible process models were studied. The adjustment to project beneficial period or product purchasing price was put forward in allusion to this kind of risks. Case study manifested that the adjustment method is feasible.
Application of Fuzzy Comprehensive Evaluation Method Considering Risk Factors in Project Schedule Management
Authors: Yi Qing Lin , Wu Juan Juan , Dai Tian Fan
Published: November 2012

The reliability of schedule management directly affects the project cost and quality. Time limit is the most important part in schedule management. The determination of reasonable time limit can save cost for investors, and ensure project quality .Based on this characteristic, this paper adopts utility curve to carry out risk analysis for risk factors, eliminates unreliable construction period and carries on fuzzy comprehensive evaluation for the rest of the possible period. Then it got scientific and reasonable time limit. The method can determine the construction period credibly and is used to guide engineering practical.
Energy Efficient Building Cost Control Research Based on Whole Life Cycle
Authors: Wang Yong Ping , Qiao Wei Guo , Fang Hui
Published: November 2012

The whole life cycle cost control is an important part of engineering construction. It comprehensively considers the construction cost and operating cost of the energy efficient building and realizes the goal of reducing the whole life cycle cost of the energy efficient building. This article breaks the limitation of cost control in operation phase of construction work, analyzes the cost control of every phases of the whole life cycle of energy efficient building and put forward a corresponding solution.
Research on the Construction Mechanisms for Intelligent Transportation Systems in Foreign Countries
Authors: Zhan Feng Ping , Wang Wei , Zhang Jian , Gu Hai Yan , Hu Yong Kai , He Shang Lu , Qiao Li Li
Published: November 2012

The construction of Intelligent Transportation Systems has been increasingly valued by countries worldwide. A proper mechanism for promoting the construction of Intelligent Transportation Systems is very important for the smooth development of these Systems. Based on the construction of Intelligent Transportation Systems in foreign countries, this article intends to analyze the development modes, organizational settings, as well as the formulation of appropriate policies and standards. It then sums up the valuable experience for the construction of China’s Intelligent Transportation Systems.
Application of NMR in the Study of Shale Gas Reservoir
Authors: Guo Wei , Xiong Wei , Gao Shu Sheng
Published: November 2012

Shale characteristic is very important in the exploitation. Using NMR determine the pore distribution of shale, it is found that the pore radii of shale samples is mainly between 3-10nm, which is in accordance with the results of mercury injection. NMR is also applied in the determination of movable fluid of shale, gas saturation of the measured 14 samples is mainly between 12% and 28.1%, no relationship is found between gas saturation and porosity or permeability.
Study about the Relationship between the Local Precipitation and Landslide in Zhejiang Province in Recent Years
Authors: Zhang Shi Min , Wang Shang Jie
Published: November 2012

Landslide is a form of moutain land diseaster. Among all the natural factors, torrential rainfall becomes the major contributor. This thesis, through the analysis of 1414 cases in zhejiang province, the precipitation in 10 days before landslide, aims to establish the landslide forecast model that triggered by torrential rainfall, which can also contrubute to the research on the mechanism of landslide caused by torrential rain.