bluuebunny/crossref_metadata_2025 huggingface dataset:
The Overall Optimization of Djoué Composite Steel-Concrete Bridge in the Congo (Brazzaville) National Road One Phase- II Project
Authors: Jia Rui Hui , Chen Yun Wei , Wang Yuan Qing , Zong Liang , Li Jun , Zhang Xi Min
Published: December 2012

In order to learn more about the composite steel-concrete bridge which the Djoué bridge of Congo (Brazzaville) National Road One Phase- II Project has selected, promote the design technologies of bridges and better understand and improve the relevant standards, The overall optimization design analysis of Djoué Bridge aiming at saving steel and improving bearing capacity is necessary. The Doctor Bridge was used in optimization of bridge type, concrete thickness and height of steel beam and they have been selected. It can provide technical references for the construction of the Djoué Bridge, the follow-up study of the composite steel-concrete bridge and the specification improvement.
Analysis of Slope Stability Containing Weak Layers
Authors: Wang Lai Gui , Zhao Guo Chao , He Feng
Published: December 2012

In order to search for the control factors of slope stability containing weak layers, combining with the methods of the finite element and the limit equilibrium to simulate the slope stability problems. From the numerical simulation results, the stress field distribution and displacement field distribution internal the slope could be got. According to the finite element analysis results and the safety factor of slope stability got with the limit equilibrium method, evaluate the slope stability. By the simulation analysis of slope which contains a number of weak structural surfaces, the conclusion we got is that the existence of weak structural plane like weak layers and faults are the main factors of slope instability.
Research on Dynamic Response of Bridge Subjected to Kinds of Load
Authors: Han Guang Cai , Wu Yan Hong , Bian Fu Guo , Liu Chao
Published: December 2012

A vehicle-bridge system is simplified as a model of Euler-Bernoulli beam subjected to kinds of load. Dynamic behavior of the beam is researched in this paper. Several equations of the beam traversed by static or moving load and mass are given. Some of these equations are time-varying nonlinear. In order to avoid the problem of instability solving the equations, precise time integration method is used. Results show that the transversal deflection of the mid-span of the beam is greater when a harmonic force or a mass is traveling on the bridge at a lower velocity or by accelerating.
Calculation of the Periodic Solution in Nakamura’s Model
Authors: Zhen Bin , Liu Zhang Jun
Published: December 2012

Nakamura’s model is one of the most practical models describing the lateral vibrations of footbridges induced by pedestrians. This paper presents a calculation of the periodic solution in Nakamura’s model. After a Hopf bifurcation analysis of Nakamura’s model, the amplitude of the lateral vibration is computed by using the energy method. The correctness and accuracy of the calculation is demonstrated by numerical simulations. Then, how the factors and variables in Nakamura’s model effect the amplitude is investigated based on the analytic solution. Our analysis results may be used to explain why the most of the predict results of Nakamura’s model are larger than the measure data.
Analysis on Foundation Excavation Side Slope Stability and Over-Break Depth of Embedded Pile Cap in HZM Bridge
Authors: Wu Qi He , Tian Wei , Qiu Zheng Zhong , Niu Zhao
Published: December 2012

In the paper, relying on the full-scale model test of embedded pile cap of the HZM Bridge, the method of combining the theoretical calculation analysis and in-situ monitoring test are used to study the slope stability and over-break depth of foundation excavation. In the theoretical calculation analysis, an empirical formula of the Hydtology of Sea-port is adopted for the over-break depth while the G-slope software is for the safety factor of slope stability; in the in-situ monitoring test, the single-beam is used for the topographic survey underwater at random after the foundation excavation. Analysising on the theoretical calculation analysis and the result of in-situ monitoring test, proper slope ratio and over-break depth of pile cap foundation excavation is put forward to provide key construction parameters for the main project of the HZM Bridge.
Study on the Time-Dependent Characteristics of Sandstone under Chemical Corrosion
Authors: Ding Wu Xiu
Published: December 2012

The masses, elastic wave velocities of sandstone specimens under chemical corrosion and pH values of solutions soaking specimens are tested in different soak time. It is indicated that elastic wave velocity can be utilized to perform time-dependent test research on the same specimen with the advantage of being highly sensitive to micro void and without damage on specimen in the testing process. The test results show that the relationships between the masses and the chemical solutions are small.The chemical erosion action on rock will reach a relative equilibrium status in a certain time in the closed chemical environment and pH value will reach ultimately one stable value which will be decided by the rock characteristics. The alkalescence of sandstone decides that the solutions of soaking specimen will turn to alkalescence.
Reconstruction Method of Existing Speed Rail Based on Precision Measurement
Authors: Chen Feng , Gu Liang Yao , Yang Yue , Wu Xiang Hua
Published: December 2012

Absolute measuring principle of the high-speed rail was introduced to the measurement of existing speed rail. The line parameter reconstruction and long-wave smooth management is implemented. CPIII control points are laid along existing speed rail. Using the track fine-adjustment instrument, the center geodetic coordinates of midline of track were measured precisely. By least squares fitting method, parameters of straight line between curves was calculated. Plane curve were reconstructed based on measured geodetic coordinates of the continuous rail. The optimization results were used for the theoretical basis, and smoothness of 30 meters chord and 300 meters chord of rail were analyzed, and adjustments of plane curve were calculated to meet the long-wave smooth of rail.
Factors of Adhesion between Asphalt and Mineral Aggregates
Authors: Zheng Chuan Feng , Zheng Shi
Published: December 2012

The factors of asphalt-aggregate adhesion were studied. Based on the expression of the adhesion work between the asphalt and mineral aggregates, several factors concerning the influence laws on asphalt-aggregate adhesion were analysed. The adhesion work of compatibility among the preparation temperature, aggregate types, and asphalt quality were calculated. The preparation temperature is found to be inversely related to the adhesion work. Among the four kinds of asphalts, the styrene-ethylene/butylene-styrene-modified one has the optimal adhesion with the mineral aggregates. Among the three kinds of aggregates, limestone has the best adhesion with the asphalts.
Influence of Material Characteristics of Asphalt Pavement to Thermal Stress
Authors: Chen En Li , Li Kun , Wang Yang
Published: December 2012

The thermal stress of asphalt pavement is one of important factor that bring pavement destruction. This dissertation using large-scale finite element analysis software-ABAQUS built the model of asphalt pavement thermal stress field with continuous temperature changing. It analyzed the effect of the change of asphalt pavement material parameters on thermal stress. The results indicate that temperature-dependent elastic modulus, property of temperature contraction and Poisson ratio can influence thermal stress, especially when the three parameters changing with temperature at the sametime, it has greater influence.
Research on the Fatigue Damage of the Asphalt Pavement
Authors: Yu Zhe Fu
Published: December 2012

Abstract: Fatigue cracking is a main form of structural damage of asphalt pavements. In general, there are four approaches to characterize the fatigue behavior of asphalt concrete. The methods including Phenomenological Approach, damage–energy fatigue approach, fatigue fracture mechanics and fatigue damage mechanics. Based on continuum damage mechanics, fatigue cycles of structural members in test can be greatly reduced and a unified approach of predicting fatigue crack initiation and fatigue crack propagation can be constructed. Generally, one damage variable is defined to account for the relative decrease of Young’s modulus with loading and, therefore, the change of Poisson ratio can not be considered. To accurately describe the coupling relationship between damage and stress fields, a bi-variable damage model to describe the variations of shear modulus and bulk modulus is the direction of future research.
Pavement Maintenance Decision Support System with Web-GIS Integrated
Authors: Peng Ting , Jiang Shan
Published: December 2012

In order to provide a effective pavement analyze and decision making platform for the highway engineers, a pavement maintenance decision support system with Web-GIS integrated is implemented in the system. In this work, format of the data is predefined as a specification of the system. All the data are organized according to their relationship. Google map service is used as Web-GIS platform. The system is implemented according to JavaEE framework. The components of the system are implemented as java classes. Pavement performance evaluation, prediction and maintenance strategy decision are implemented as corresponding services. They are integrated as a system. According to the results, the system is effective and reliable.
Calculation and Evaluation on Dynamic Characteristics of Bridge-Subgrade Transition Section in Speed-up Railway Line
Authors: Zhang Bin , Zhao Xiu Shao , Liu Qing Jie
Published: December 2012

Combined with the reconstruction of the existing railway line with speed of 200km/h, a calculation model of bridge-subgrade transition section was developed by the theory of vehicle-track-bridge/subgrade coupling dynamics. The simulation program was compiled, which could be used to calculate and evaluate the dynamic characteristics of transition section in speed-up line. The results of field reconnaissance operations and calculations show that the track structure stiffness in transition section is uneven, or even part of the function fails, which can not meet the requirements of speed-raising. Some measures, such as transition section database establishment, class-based management implementation, separate design and separate reinforcement adoption, can be used for the transition sections, which are listed as the objects of emphatic assessment. In addition, the evaluation system will provide theoretical support and references for design and construction in reconstruction project of transition section.
Laboratory Study of Marshall of Basalt Fiber-Modified Asphalt Mixture
Authors: Fan Wen Xiao , Zhang Shi Fu , Liu Li Qing
Published: December 2012

To discuss basalt fiber adding quantity to the influence of Marshall test results of asphalt mixture. Through the Marshall test, the changing regulation of marshal indexes of various grading asphalt mixture with different basalt fiber adding quantity were studied respectively, and comparative analysis of Marshall index with xylogen fiber polyester and fiber asphalt mixture were done. The results show that the improvement effects for Marshall index are remarkable by addition of fiber, and compared with polyester fiber and xylogen fiber, the improvement effects of basalt fiber is better.
The Application Analysis of Micro-Surfacing in High Grade Highway Asphalt Pavement Preventive Maintenance
Authors: Dula Man , Hu Xiao Yu
Published: December 2012

In domestic asphalt pavement micro-surfacing technology is a new kind of pavement maintenance technology. Starting with the micro-surfacing technology application effect, we analyzed the micro-surfacing technology characteristics and application conditions. We also analyzed and discussed the application prospect, strive to provide a technical reference for promotion and application of micro surfacing technology.
Study on Vertical Earth Pressure of Slab Culvert under High Embankment
Authors: Ning Bao Kuan , Fan He , Gong Lei , Liu Guo Qing
Published: December 2012

With the increasing of embankment culvert engineering applications, there has been due in part to the structural design is too conservative and not economic or select unreasonable structural form, leading to the phenomenon of cracking or even collapse of the culvert structure, and the phenomenon has seriously affected the normal use of the highway. In this paper, the numerical simulation of vertical earth pressure distribution on different structural forms of embankment on culverts, to discuss the impact of boundary conditions, fill height, the thickness of the culvert culverts vertical earth pressure. Combined with Heda highway a culvert covert field test results and numerical simulation results were compared and analyzed. The results show that the numerical simulation and field test results in good agreement with the culvert structure in the form of vertical earth pressure of the embankment culverts have a greater impact; the structure of different forms of the culvert in the upper soil pressure is significantly different. In addition, analysis of the impact of boundary conditions, filling height of culvert vertical earth pressure values. The results can reference for the study of the structural design of the embankment culverts security.
The Study on the Support Technology of the Soft Rock Roadway for Coal Mining under Sea
Authors: Wang Xiang Gang , Yuan Kang , Wu Xun Zhen , Zhu Wei Shen
Published: December 2012

Based on the engineering background of -350m level roadway in Beizao Coal Mine ,three schemes about the excavation and support of the roadway were simulated via the coupled fluid-solid theorem in the the finite difference software FLAC3D. The stability of the soft rock roadway and the effect of bolt-grouting support were analysed according to the obtained numerical results of displacement,principal stress and plastic zone.It is concluded that the seepage has an influence on the stability of the soft rock roadway,besides,it is proved that the bolt-grouting support is rational and effective in the design of support concerning the soft rock roadway.The study has important guiding significance to other similar engineering.
A Study on the Intelligenti Zed Marine Oil-Spill Rapid-Clearing System
Authors: Zhang Xiao Jun , Li Shang Ping , Zhang Yuan Fei
Published: December 2012

At present it is difficult to thoroughly clear away the marine oil-spill when collision takes place. As we know the traditional oil-spill-treatment is slow and the oil pollution can not be handled timely. In order to clear the surface oil and protect marine environment, a study on rapid- clearing of marine oil pollution system is presented in this paper, which is equipped with a high-resolution camera on the top of the oil pollution lifter to identify the oil pollution and get data by image processing, then the oil pollution recovering which is set in the front of the oil storage tanks collecting oil spill by the single-chip machine while moving. Thus the oil spill can be separated into clean oil and water by the oily-water separator through the flexible tube. This system is more efficient, cleaner and less-polluted than the traditional one, which is worthy of large area surface oil-spill clearing.
The Exploration and Application of Underwater Shaped Charge Blasting Circuit in Reef Engineering
Authors: Chen Shou Feng , Liu Dian Shu , Zhang Qing Cheng , Gan De Hu
Published: December 2012

According to the reef blasting environment characteristics and shape charge blasting construction technology requirement, we design a set of electric detonator - detonating cord - unconductance detonation tube detonator network. Introducing the engineering application of three kinds of network connection mode, the craft is simple, the operation is convenient, safe and reliable. It has reference and application value in the similar engineering.
A Study on the Failure Mechanism of Suction Caisson under Vertical Load
Authors: Jin Shu Cheng , Zhang Yong Tao , Wu Qi He
Published: December 2012

As a new type of deep water offshore foundation, suction caisson is widely used to offshore structures. However, the current methods of evaluation and design cannot meet the increasing requirement of engineering practice. In this dissertation, the studies are emphasized on finite element method for analyzing the suction caisson bearing capacity behavior and the failure mechanism under the vertical load. Based on studying the vertical bearing behavior of caissons with different ratio of length to diameter L / D, it shown that as L / D increases, the vertical bearing capacity growth slowed.
SPH Method Applications for Coastal Wave Breaking and Wave-Structure Interaction
Authors: Bai Zhi Gang , Zhao Jun
Published: December 2012

The Smoothed Particle Hydrodynamics (SPH) method is a mesh-free Lagrangian approach which is capable of tracking the large deformations of the free surface with good accuracy. A three-dimensional SPH model was proposed to simulate the wave–structure interaction (WSI), in which a weakly compressible SPH model was introduced to investigate the wave breaking and coastal structure. To validate the SPH numerical model, three different types of wave breaking, namely, spilling, plunging and surging breaking were successfully simulated. The computations were compared with the experimental data and a good agreement was observed. The hydrodynamics model of interaction between wave and structure was established according to Navier-Stokes equations in SPH style. And the model was used in simulating the interaction between wave and a series of new type breakwaters. It is proven to be a promising tool and able to provide reliable prediction on the wave-structure interaction in coastal engineering.
Comparative Analysis of Frame-Core Wall Structure for Seismic Design
Authors: Yang Jing , Fan Jiang , Yuan Ji Xing , Zhang Qing
Published: December 2012

In this paper a skyscrapers frame-core wall structure as an example in Kun Ming, using two independent software, SATWE and ETABS, analyzed the dynamic characteristics and dynamic response of structures with earthquake in linear elastic phase and the elastic-plastic phase respectively, so that could evaluate rationality of the design of the structure as a whole and seismic performance superior or not, and it could provide an idea for audit drawing or proofread their own.
Calculations on Roughness of Rock Fracture Based on Image Processing
Authors: Yu Xiao Bo , Zhang Yang Song , Li Ruo Yao
Published: December 2012

Joint roughness coefficient (JRC) is an important factor in the evaluation of the shear strength and deformation parameters of rock joints. This paper presents a method for measuring JRC of rock fractures based on digital image progressing technique. Though preprocessing of the rock fracture image, the skeleton of the fracture was got, the rough degree were analyzed and quantized by geometric parameters of the skeleton. By establishing the relationship between JRC and the rough degree, JRC will be got though the rough degree. This method improves automation degree and accuracy comparing to the previous methods. Finally this method was used to get the JRC of rock fracture in Jijicao, Beishan, Gansu province, where may be the high-radiation nuclear waste repository.
Elasto-Plastic Dynamic Responses Analysis of Double-Layer Spherical Lattice Shells under Multiple Earthquake Excitations
Authors: Song Bo , Shi Hong Yu , Zhao Li Dong , Yu Jian Yun
Published: December 2012

Based on the large geometric deformation and nonlinear of material theories, the seismic responses of a double-layer spherical lattice shells structure were studied. The results show that under multi-dimensional earthquake, the maximum displacement and axial stress, as well as plastic ratio of the structure will be obviously increased than those corresponding to the responses under single-dimensional earthquake. When long-period seismic wave was taken as the input wave, the responses of the structure were the maximum.
Influence Analysis of Welding Residual Stress for Seismic Behavior to Side-Plate Reinforced Section
Authors: Liu Yun , Mao Cheng Chao , Song Yong Jie , Song Xue Jing
Published: December 2012

Taking side-plate reinforced section as research objects, this paper establishes the models by Ansys non-linear finite element method and simulates welding process of with birth-death element method. Comparing the different seismic index among test specimen and finite element models that based on whether or not considering welding residual stress, based on which, this research draws a conclusion that the influence of welding residual stress for seismic behavior to side-plate reinforced section is not obvious.
Stability Analysis and Potential Seismic Capacity Evaluation of an Elliptic Paraboloid Latticed Shell
Authors: Duan Xiao Nong , Yang Zhu Juan , Tang Neng , Chen Xue Ting
Published: December 2012

The stability and the potential seismic capacity of the double-layer elliptic paraboloid latticed shell roof structure of a stadium was analyzed and evaluated, performing by Midas Gen software. Firstly, the seismic response spectrum analyses and the linear time-history analyses were carried out respectively on two different analysis models: the integral structural model containing the lower support structure and the single latticed shell model. The seismic response characteristics and the potential seismic capacity of the models were compared and evaluated. Secondly, based upon the real detailed design of the stadium, the static stability of the latticed shell was analyzed, considering both the geometrical non-linearity and the initial imperfection. Thirdly, the influence of the effects of the vertical ground motion upon the latticed shell structure was studied. The analysis method adopted and the conclusions obtained can be used as references for the future similar engineering projects.
Seismic Damage Investigation of Residential Fill Ground in the Eastern Part of Kyoto Basin
Authors: Cai Xiao Guang , Bo Jing Shan , Toshitaka Ka Mai , Wang Fa Wu , Li Ju Wen
Published: December 2012

Several earthquakes record that the residential fills always suffer severe damages. In order to know the seismic damage mechanism and evaluate the damage extent of residential fill ground, research is carried out on two fill grounds in the eastern part of Kyoto basin. The research includes field survey about terrain condition, geological condition, development history, disaster condition during 1995 Kobe earthquake and surface wave explorations. Some remarkable conclusions are summarized as follows: In Jyodo-ji area, it is a residential fill on soft alluvium ground. The geological condition is back swamp. The thickness of surface fill soil is about 1~4 meters. In Kiyomizu-dera area, it is a valley filled ground. The geological condition is hilly platform.
Geological Modeling System Based on Flash3D Technology
Authors: Huang Mu , Rong Xiao Li
Published: December 2012

3D geological modeling is an inter-discipline subject applying computer technology to the geological research. With the development of Internet, 3D geological modeling based on Web has become a hot spot. In this article, we applied the Flash3D technology to the 3D geological modeling based on Web. We designed a process which use borehole data as original data source, automatic interpolation and identify strata from it, then calculate modeling data. We developed a 3D geological and geographical system based on Flex and Java platform using Flash3D engine technology. The system is a true 3D geological modeling software in B/S mode.
Analysis of Land Use Dynamic in Genhe City Based on GIS and RS
Authors: Sun Jing Wen , Wang Hong Qi , Zhang Ya Fu
Published: December 2012

The paper chooses Genhe, Inner Mongolia as the research area. Based on ArcGIS 9.2 and ENVI 4.8 software, the TM images of 2000、2004 and 2010, the decision tree classification was applied to interpret the images, and the land use data of 2000、2004 and 2010 were obtained. The land use transformation matrix and land use dynamic degree were analyzed further. Results are shown as follows. (1) Decision tree classification can be used in the study area and classification accuracy is high. (2) Land use change underwent a process of obvious change from 2000 to 2010. The areas of forest and residential land underwent substantial increase, while the areas of sparse forest and grassland got a huge decrease.
3D Modeling of Submarine Based on Digital Close Range Photogrammetry
Authors: Sun Ying Jun , Cui Xin Guo , Xu Zun Yi
Published: December 2012

A new method to realize 3D measurement and modeling based on Active Control System was put forward in the paper. The Active Control System included two parts: one was for the calibration of digital camera, and the other was for the six-freedom control of digital camera. This method enlarged the intersection angle and improves the intersection precision by multi-baseline photography; enlarges the angle of view by panning photography, and resolves the difficulty of matching for images with large intersection angle. The experiments proved that this method can acquire the high accuracy and improves the production efficiency.
Study on Ultrasonic Testing Equipment EMATEST-BB
Authors: Gong Qing
Published: December 2012

EMATEST-BB is a set of ultrasonic testing equipment for automated final examination of bars. The important specific of the equipment (eddy current system +ultrasonic testing system) is that the combined test station allows one to perform acceptance examination of the whole bar: body + surface, at the same testing position. This Paper mainly describes installation, setting-up and operation of software of ultrasonic testing equipment (UTE) computer system.
Calculation and Analysis of Water Quality Improvement Caused by Water Diversion in Nanjing Qinhuai River
Authors: Tong Chao Feng , Lv Li Rui , Shao Yu Yang , Hao Jia Ling
Published: December 2012

To explore the impact of changes in water quality of the Nanjing Inner Qinhuai River water system in different water diversion way and to assess the transfer effect, an one-dimensional hydrodynamic and water quality model for Inner Qinhuai River was established to simulate and analysis the responds of water quality on the different nutrient loading and different diverted water. Four different water discharges diverted from Xuanwu Lake and Exterior Qinhuai River and two loads including the present load and 50% reduction were considered. The result shows the water quality can be improved significantly only as enough water is diverted and the sewage is intercept in the Middle Reach of the Inner Qinhuai River.
Numerical Simulation of Flow over Aerators on the Chute with an Anti-Arc Section by Turbulence Flow Model
Authors: Xu Yi Min , Wang Yao , Hou Ji Rui , Wu Hua Qiang , Liu Xian Dong , Lv Ming Guang
Published: December 2012

For a flow chute with complex boundary conditions, such as with an anti-arc section, the flow behaviors and characteristics of aeration after the aerator are more complex than that in the straight chute. Based on the k~ε turbulence flow model together with VOF method, flow velocity fields over the aerator on the chute with anti-arc section were numerical simulated. Model experiments were investigated to verify the simulation results. Comparison shows that the calculation results agree well with the observed experimental data. Some factors including radius of the anti arc, aerator’s height and takeoff angel which influence aerated flow are discussed.
Visual Simulation of Flood Discharge for Reservoir Spillway
Authors: Li Wen Qian , Ren Bing Yu , Tong Da Wei
Published: December 2012

In order to guarantee the security of flood discharge and energy dissipation of reservoir spillway, in this paper, visual simulation of flood discharge is studied combining closely with a reservoir extension project. Based on the data sources collected by traditional data acquisition methods and modern information capture means, key techniques such as modeling of spillway, dynamic simulation of the flow and texture mapping and other corresponding methods are put forward. Then visual simulation of flood discharge for reservoir spillway is realized. This study provides an analysis platform, which is safe, economic, intuitive, easy to operate and repeatable, for simulation of spillway flood discharge in reservoir projects. It also provides a scientific and effective theoretical foundation and technical support for the engineering design, management and decision-making.
Assessing the Impact of Climate on Actual Crop Water Use over Irrigated Rice and Rape in East China Plain over Four Decades
Authors: Salahou Mohamed Khaled , Zhang Xiu Ju
Published: December 2012

Evapotranspiration (ET) is an important component of the water cycle at field, regional and global scales. This study used measured data from a 40-year (1970–2009) in the East China plain on Rape and Rice to analyze the impacts of climatic factors on actual crop water use and crop yield. The results showed that grass reference evapotranspiration (ET0, calculated by FAO Penmen Monteith method) was relatively constant from 1970 to 2009. Average seasonal crop water use was 250 mm and 154 mm for Rice and Rape, respectively, over the four decades. The seasonal decrease in crop water use was around 1.4 mm per season for Rice, and 0.08 mm per season for Rape. Average seasonal effective rain was 456 mm and 120 mm for Rice and Rape, respectively, over the four decades. The seasonal increase in effective rain was around 0.7 mm per season for Rice, and 0.03 mm per season for Rape. The result showed that over the four decades actual crop water use decrease much greater than the increase in effective rainfall. The results also showed that with new cultivars and improved management practices it was possible to further increase grain production without much increase in water use.
Numerical Simulation and Flow Field Analysis of Suspended Grid Stilling Pool Based on VOF Method
Authors: Wu Zhan Ying , Mu Zhen Wei
Published: December 2012

The unsteady flow RNG k ~ ε turbulence model and VOF Method are employed to numerically simulate 3-D flow field of diversion tunnel outlet stilling pool in Xinjiang dina river wuyi reservoir. The computational and experimental water surface elevation, pressure on the bottom and cross-sectional mean velocity of the suspended grid stilling pool are compared in well agreement. Suspended grid is used in stilling pool, the number of vortex and range are increased in the pool, and the size of the vortex is decreased along with the flow increase. The suspended grid position is determined at end of the vortex. In the suspended grid stilling pool water stability, flow regime is good.
2D Simulation of Flow Field of Horizontal Sedimentation Tank
Authors: Liu Y.L. , Lv B. , Zhang P. , Wei W.L.
Published: December 2012

In this paper, we use 3D time-averaged equations and the 3D k-ε turbulence model to numerically simulate the flow in a horizontal sedimentation tank. The PISO algorithm is used to couple velocity and pressure. The results show that the model can provide a reference in designing sedimentation tanks.
The Influence of Wall Structures to Air Conditioner Energy Consumption Based on the Characteristics of Intermittent and Loculose Energy Use
Authors: Li Jin , Qian Xiao Qian , Zhu Yao Tai
Published: December 2012

In some areas like south of China, energy is used in part time of the 24 hours and part space of the buildings, that is the characteristics of intermittent and loculose energy use. The energy consumption of the air conditioner can be calculated from the transient state with the help of numerical computing method. Among different wall configurations of self-insulation, internal insulation and external insulation walls, it shows that self-insulation and internal insulation walls performs better than external insulation walls in energy saving. The energy stored by walls which account for the most part of the energy consumption can be sharply reduced in the configurations of self-insulation, internal insulation walls.
Stability Comprehensive Analysis Model of Iron Deposit Retained Goaf
Authors: Lu Hong Jian , Yan Shu Hui , Pan Gui Hao
Published: December 2012

The paper established retained goaf stability analysis model in iron deposit based on the organic combination of three zone theory, rock movement theory and finite element theory. Taking a mine in Hebei as an example, qualitative and quantitative analysis was conducted on the stability influence of mine retention goaf to obtain a satisfactory evaluation effect and verify feasibility of the stability comprehensive analysis method. The results provide a scientific basis for the necessity to process the mine goaf.
Application of Fuzzy Comprehensive Evaluation in Stope Structural Parameters Optimization
Authors: Guo Qi Feng , Ren Fen Hua , Miao Sheng Jun , Chen Xin
Published: December 2012

Alternate Room-Pillar Mining Method with Ascending Backfill is now used in deep mining of Sanshandao Gold Mine. In mining practice of the metal mines, the widths of the room and pillar vary from 6m to 15m. In order to improve the production capacity and solve the deep mining safety problems, a fuzzy optimization model containing 11 evaluation indexes was built to choose the optimal structural parameters among 8m×8m, 8m×10m, 10m×10m, 10m×12m and 12m×12m. The fuzzy comprehensive evaluation results prove that the optimal stope structural parameter is 10m×10m for safety and high efficiency mine operation.
Damage Assessment of One Prestressed Concrete Bridge after Fire
Authors: Xiang Kai , Wang Guo Hui , Liu Hua Xin
Published: December 2012

The assessment method of fire-damaged concrete bridge with prestressed hollow core plate girders was presented in this paper. The historical sketch of assessment of fire-damaged concrete structures was briefly introduced. One fire-damaged concrete bridge with prestressed hollow core plate girders was shown as an example. The process of assessment of fire-damaged concrete bridge with prestressed hollow core plate girders was provided. According to the assessment results, methods of repair and strengthening were presented for different fire-damaged level of prestressed hollow core plate girders. The research results could help expand use of fire-damaged assessment and repair of prestressed concrete bridges.
Numerical Simulation on Bottom Hole Flow Fields of Reverse Circulation Bit
Authors: Bo Kun , Wang Mao Sen , Zhao Zhi Qiang
Published: December 2012

Air reverse circulation (RC) drilling is becoming an increasingly popular technique in engineering fields. It can be used in geological exploration, water well drilling and infrastructure construction and so on. RC bit is the key accessory in this technique. Its structural parameters directly influence cutting transportation during reverse circulation drilling. In order to explain the formation mechanism of reverse circulation, established mathematical models and physics model of the RC bit and studied drilling fluids transportation under the bottom hole. Conducded numerical simulation about velocity field and pressure field of bottom hole flow field using software FLUENT with different parameters of the RC bit, including the size and position of nozzles, the angle of inner nozzle and so on. The result of simulation and experiment show that increase of the effective turbulence zone can improve efficiency of RC transportation. Inner nozzles can produce stable negative pressure region in the central channel, and ensure cutting transportation as RC methods. The data and results are helpful to optimize the structure and size of the RC bit. It can shorten the research period, decrease costs and improve the design ability.
An Analysis Method of Torpedo Shell Fluid-Structure Interaction Based on Fluent and ANSYS
Authors: Li Nan , Song Bao Wei , Wei Kai
Published: December 2012

At present, the torpedo shell analysis includes fluid analysis and structural analysis. The fluid pressure distribution of torpedo surface is the results of the fluid analysis, and it is the outer load input of torpedo shell analysis. Meanwhile the results of torpedo shell structure analysis also play a important role in binding. So torpedo shell structure analysis is a fluid-structure interaction analysis. With the development of engineering analysis software, Fluid analysis software Fluent and structural analysis software ANSYS are able to analyze torpedo fluid and structural. But there has not been a specialized software to handle fluid-structure interaction analysis. This paper coupled Fluent and ANSYS, and got an analysis method for torpedo shell fluid-structure interaction analysis base on Fluent and ANSYS
Research on Real-Time Interactive Simulation for Concrete Dam Construction Process Based on Vega
Authors: Ren Bing Yu , Guan Tao
Published: December 2012

Combining the techniques of discrete event simulation and virtual-reality, research on real-time interactive simulation for concrete dam construction process is conducted, under the virtual-reality environment. The key technologies are discussed, including the modeling of DEM, optimization for real-time displaying of 3D scene, collision checking, real-time interaction and so on. A framework for the system of virtual-reality simulation for concrete dam construction operations based on Vega is presented. Virtual-reality supplies for construction simulation with a real-time interactive 3D simulation environment to inspect the validity of simulation model, which improves the simulation credibility and becomes a helpful tool for real-time decision making of construction operations. An example is performed to illustrate the feasibility of the system.
Modeling and Dynamic Simulation of Cable
Authors: Yang Wen Lin , Wang Zhong Bin , Yan Bing Lei
Published: December 2012

The cable between elevator and cage was used as the object of this study, we use the finite element theory to establish the finite element model of the cable system. Then the motion response curve between the elevator and cage and the tension curve of the cable was gotten from solving the finite element equation by using the Runge-Kutta method. We have studied the effect of the length of the cable on the motion response between elevator and cage.
Research on the Shear Strength Properties of Expansive Soils
Authors: Chen Yi , Zhao Jing , Hu Xiao Hong
Published: December 2012

The shear strength of expansive soils is now a key geotechnical problem. The water content and dry density of expansive soils have deep effect on its shear strength. For analyzing the detail relationship of the water content, dry density and shear strength of this special soil, direct shear test was carried out with the samples from Xinxiang in middle line of South to North water diversion project. The results indicate that both of the cohesion and friction angle grow with dry density and decrease with initial water content. Applying the linear regression calculation, we obtained mathematical expressions which reveal the variation of shear strength with the dry density and initial water content of Xinxiang expansive soils.
Efficient Data Streams Based Closed Frequent Itemsets Mining Algorithm
Authors: Tan Jun
Published: December 2012

Online mining of frequent closed itemsets over streaming data is one of the most important issues in mining data streams. In this paper, we proposed a novel sliding window based algorithm. The algorithm exploits lattice properties to limit the search to frequent close itemsets which share at least one item with the new transaction. Experiments results on synthetic datasets show that our proposed algorithm is both time and space efficient.
Comparative Analysis of Singapore High-Risk Construction Work Permit-to-Work Mechanism with China Management Mechanism of Section(Subsection) Works with Major Hazards
Authors: Yu De Ming , Jia Xiao Bin
Published: December 2012

Mainly based on Singapore’s workplace safety and health (construction) regulations 2007 and China’s safety management measures for section(subsection) works with major hazards 2009, the paper introduces and analyzes the Singapore’s safety management system for high-risk construction works, and simply compares it with the management mechanism of China’s section(subsection) works with major hazards, the following conclusions are drawn: (1) The application scopes of Singapore’s high-risk construction work permit-to-work system and China’s the management mechanism of section(subsection) works with major hazards are different, and generally speaking, the former includes more construction works than the latter. (2) The mechanisms of Singapore’s high-risk construction work permit-to-work and China’s management of section/ subsection works with major hazards are different. (3) In Singapore no independent construction safety supervision system exists, while in China it is usually required by the laws. (4) In Singapore any person who contravenes any provision of workplace safety and health (construction) regulations 2007 which imposes a duty on him shall be guilty of an offence and may be liable on conviction to imprisonment for a term not exceeding 2 years; in China any person who contravenes any provision of safety production law, building law and corresponding safety regulations but doesn’t lead to serious consequences shall not be liable on conviction to imprisonment. (5) In Singapore the safety assessor evaluating and endorsing the application for a permit-to-work must assume his lawful duty for his undue conducts and decisions, in China the safety experts responsible for checking the special safety construction scheme needn’t assume any lawful duty.
Calculation Method for Bearing Capacity of Foundation Soil Based on Potential Slip Line Theory
Authors: Li Li Min , Zhang Guo Xiang
Published: December 2012

To solve the bearing capacity of foundation soil problem, through theoretical analysis and proof, a new method used to calculate bearing capacity of foundation soil is proposed, and the solving potential sliding curve and corresponding analytical program is devised. A continuous stress field of foundation soil is gained, by using the analysis of elastic-plastic finite element analysis of foundation soil for differ load; the numerical integration is used to make sure of the potential sliding curve, the most dangerous potential sliding surface, and the stability factor. The method has a rigor basis. Through many examples and engineering tests, the proposed method has good comparability with other method, and it can take into account many influence factors, such as the width and embedded depth of foundation, soil gravity, layered soil and etc, and it can also trace the trend of soil failure development and make clear the failure mechanism of foundation soil.
Study on Safety-Typed Transportation Construction Professional Talent-Training Mode
Authors: Shi Chun Xiang
Published: December 2012

For the implementation of the Ministry of education of China on “Excellence Engineer talent training project” spirit and the training target of safety-typed transportation construction professional talents in Shanghai Institute of Technology, talent training scheme revised 2012 edition was modified as the background. According to the analysis of the situation in the current transportation construction industry development and the talent market demand, combined with the training experience and professional achievements, the professional orientation with safety science concept was presented, the talents training "3 +1" mode was implemented as the main form of Excellence Engineer cultivation mode, and the teaching system including theory course system and practice course system were studied and reformed in this paper, it presents a reference of safety-typed transportation construction professional talents training mode for similar colleges in China.
Study on the Channel Slope Safe Stability
Authors: Li Guang Ming , Liu Chun Yuan , Chen Pei
Published: December 2012

It is well known that the slope stability analysis is the core of the slope engineering study .The key of the study slope safety stability is optimize the slop coefficient。And the reasonable coefficient decides the design of slope type structure.This paper used the simplified Bishop method which according to the limit equilibrium theory as the foundation and the finite element numerical simulation to solve the south-to-north water transfer engineering slope instability problem.So it can provide the theory basis and design opinion for the slop construction engineering in the future.
Nanotech Engineer Competence Development Quality: Quantitative Evaluation
Authors: Gnitetskaya Tatyana N. , Ivanova Elena B. , Karnauhova Elena V.
Published: December 2012

The aim of this article is to make a brief description of a quantitative method of evaluation of development of the nanotech engineer competences. The description is given by the example of development of the science-based world view. Also this article provides explanation of a quality parameter and its significance for a structure mentioned in this article.
Numerical Test Study on Ground Frost Heave Deformation Caused by Artificial Horizontal Ground Freezing Method
Authors: Bi Gui Quan , Wang Dong , Li Ning
Published: December 2012

Aiming at frost heave problem existing in tunnel construction with artificial horizontal ground freezing in coastal areas, this paper puts forward an equivalent load method for frost heave simulation and a nonlinear deformation simulation method for soil around frost wall. Employing the numerical test method, the designing parameters’ influence on ground frost heave is studied systematically. These parameters include depth of tunnel, frozen wall thickness, excavation radius of tunnel and frost heaving ratio. Furthermore, some measures are proposed to reduce ground frost heave.
Application of GPR in Evaluation of Stability on Rocks Surrounding Hand-Dug Piles
Authors: Tang Min An , Sun Bao Ling
Published: December 2012

GPR is used to detect rock surrounding the hand-dug pile foundations of a bridge for the highway surrounding Fuzhou, capital of Fujian Province, so as to evaluate the rock the stabilities of the rocks on the outer side of the file foundations and at the base of the file foundations and thickness of overburden over the base rocks. In this paper, some parameters are selected for detection, such as antenna of center frequency 100 MHz, data acquisition time window of 500ns , offset distance of 1 m，which can meet the effective detection range (depth) of 20 m or more . Annular cross-section method is used at the bottom of Piles , and vertical cross-section method is used on the side of piles. The results show that GPR records can provide a number of clear and accurate information such as the rock cliff boundaries of pile lateral wall , the internal structure at the bottom of pile and pile lateral wall.
Geotechnical Centrifuge Shaking Table Tests and Numerical Simulation of Soil-Structure
Authors: Liu Jing Bo , Zhao Dong Dong , Wang Wen Hui , Liu Xiang Qing
Published: December 2012

Two geotechnical centrifuge model tests of a soil-structure system with different burial depths are performed to investigate the interaction between soil and structure. The tests are performed at 50 gravitational centrifuge accelerations and the input motion is Kobe wave. This paper focuses on the accelerations and displacements in the soil-structures system. The peak accelerations and displacements along the axis of the structure and along the vertical line 17cm away from the axis are presented. The acceleration and displacement response due to the interaction between soil and structure are studied.