bluuebunny/crossref_metadata_2025 huggingface dataset:
Modeling of Earthwork Dynamic Allocation for Rock-Fill Dams
Authors: Zhao Chun Ju , Wang Chun Yu , Zhou Yi Hong , Zhou Hua Wei
Published: December 2012

By analyzing feeding sources and material accepted fields involved in the earthwork allocation for rock-fill dam, a dynamic model of earthwork allocation is set up by incorporating dynamic programming. Dividing filling and excavation process into n steps, functions of allocation costs during each period is defined according to equation of state transitions, on the basis of which the optimization function is formed. Then the sequential method is employed to get the optimized solution. Finally a practical case is studied for application of this model.
Researchs on Optimization Degree Evaluation Method for Risk Population Allocation on Emergency Evacuation Path with Reservoir Dam-Break
Authors: Zhang Shi Chen , Zhou Ke Fa , Wang Xiao Hang
Published: December 2012

Optimization degree of risk population allocation on evacuation route is one of the key points impacting emergency evacuation efficiency in dam-break event.The evacuatees optimization allocation mechanism considering route flow and route length was studied; optimization degree evaluation methods based on submerged number were constructed; corresponding formula for calculating submerged number was deduced; optimization degree classification and its standards were put forward; its availability was proved through case simulation.
Numerical Simulation of 3-D Unsteady Flows in Flow Passage on Spiral Case of Hydro-Turbine
Authors: Li Ze , Liang Zhi Lin
Published: December 2012

Based on the Reynolds averaged Navier-Stokes equations, numerical simulation of unsteady flows in the flow passage in spiral case of a hydro-turbine was conducted. The computational domain of the flow passage includes spiral case, stay vanes and guide vanes. The RNG turbulence model in curvilinear body-fitted coordinate systems with finite volume algorithm is adopted. Numerical calculations are conducted under the boundary condition with operating regime for current guide vane openings. And pressure distribution and velocity distribution within the flow path are obtained. The results are helpful to improve the comprehensive hydraulic performances and to enhance the operating stability of a machinery set.
Computation of Filling Time of a Ship Lock
Authors: Gao Zhu , Fang Shi Long , Shi Xiao Tao , Gu Zheng Hua
Published: December 2012

In this paper, Steady-flow Integration Approach (SIA) and Volume of Fluid (VOF) method are both used to calculate the filling time of a ship lock. The values of filling time derived from these two different methods have the same order of magnitude. SIA is only used to give a quick but coarse estimation; however in the application of more time-consuming VOF approach, the fluctuations of water surface are additionally considered and computed, It provides a more precise estimation of the filling time and a more realizable details about the filling process. In practical engineering, the geometry of ship lock will be far more complex than here; the SIA is not enough to satisfy the demands for a desired design. The VOF method will be a nice choice and give reasonable predictions of filling time, water fluctuations and velocity fields in the ship lock.
Influence Mechanism of Isolation Layer to Granular Media Flow
Authors: Liu Yun Xiang , Chen Qing Fa , Chen Hong Qi
Published: December 2012

By using particle flow code (PFC2D), influence mechanism of isolation layer to granular media flow was studied by simulating two ore-drawing modes of filling mining method (working condition Ⅰ) and synchronous filling shrinkage method(working condition Ⅱ). After analyzed simulation results, some laws were gotten: (1) by the fitting process conducted on released volume and height, it is found that the relationship of released volume and height was power equation, which is same as the stochastic medium theory for ore-drawing; (2) The released volume, the size in most width of loosing body and the location of working condition Ⅱ was both bigger than those of working condition Ⅰ; (3) the radius of curvature of drawn-funnel of working conditionⅡ was bigger than those of working conditionⅠ, but the volume of residual ore was opposite. Analysis shows that the isolation layer reduced the contact force in ore drawing regional, made the porosity bigger, so as to improve liquidity. The results provide a theoretical reference for the changes in underground mining techniques and ore-drawing control.
Numerical Simulation of Maximum Scour Depth of the Riverbed above a Subway Tunnel Crossing the Tidal River
Authors: Chen Jun , Huang Ai Feng , Chen Hong , Li Yong Tao
Published: December 2012

To ensure the secure buried depth of the subway tunnel which was routed underneath the Fenghuahe River, a two-dimensional tidal current and sediment transportation model was established to simulate the maximum scour depth of the riverbed. The conclusions were shown as follows: the most disadvantageous hydrologic condition was a combination of the 200-year return period flood in the Fenghuahe River and the 5-year highest tide in the Yonghe River. The maximum scour depth of the riverbed above the subway tunnel was 1.19 m and the lowest elevation of the riverbed cross-section was -8.56m. The results could provide technical support for the safety of subway design.
Influence of Upstream Runoff Variation on Suspended Sediment in Yangtze Estuary
Authors: Tong Chao Feng , Yin Tao , Shi Jian , Shao Yu Yang
Published: December 2012

For the construction of water conservancy project in the upstream of the Yangtze River and the human activities, the runoff and sediment discharge from the upstream to East China Sea have changed greatly. To explore the distribution characteristics of suspended sediment in Yangtze Estuary under the new upstream boundary condition, a 2-D flow-sediment numerical model including the Yangtze Estuary and the Hangzhou Bay was established. Four different runoffs, which are 4,620m³/s, 11,000m³/s, 75,900m³/s and 90,000m³/s respectively, and the correspond sediment discharges were considered. The result indicates that, with the increase of upstream runoff, the sediment intrusion from the top of the North Branch into the North Branch decreases and the suspended sediment concentration field in the South Branch changes is greater than that in the North Branch. In the same region, the sediment concentration decreases during rising tide while it increases at low tide. The change of the core position for suspended sediment field is insignificant.
Slope Anchoring Technology in China: State of the Art Report and its Prospect
Authors: Cheng Yong Gang
Published: December 2012

Anchoring technology is an engineering research focus for its successful application in practice and huge economic benefits in slope stabilizing. To construct an anchorage, all steps are in the same importance and any mistake may cause an entire failure. In order to promote the combination of the applications and the theoretical studies of slope anchoring, the theoretical results, practical utilities and quality-control methods on slope anchoring in recent 20 years were discussed in this paper. The load transfer mechanism of anchorage body and the active mechanism of ground anchorages were detailed mentioned. As to practical utilities, the construction standardization, anchorage type, grouting, corrosion prevention, and other techniques were presented. When it comes to quality controlling, some discussions on anchorage field experiments, long-term monitoring, and non-destructive examination were carried out. Finally, some suggestions are proposed on open questions about theoretical study, practical utility, quality controlling.
3D Simulation of Flow in an Aeration Tank with Two Pipelines by a Two-Fluid Model
Authors: Wei W.L. , Zhao X.J. , Liu Y. L.
Published: December 2012

In this paper, a numerical two-fluid flow model combining with the Realizable k–ε turbulent model for compressible viscous fluid is presented for the computation of flow characteristics in an aeration tank; and the equations are solved with the finite volume method. A multigrid technique based on the full approximation storage (FAS) scheme is employed to accelerate the numerical convergence. The numerical results for velocity and turbulent kinetic energy distribution in the aeration tank are obtained. It is shown that the Computational Fluid Dynamics (CFD) is a valuable tool to analyze the interaction of flow field and aeration.
Analysis of the Periodicity of Annual Extreme Runoff at Datong Station, Yangtze River, China
Authors: Wu Ling Li , Zhang Wei , Wu Teng
Published: December 2012

The periodicities of the annual maximum and minimum runoff time series at Datong hydrological station in the Yangtze River（P. R. China）were analyzed, according to the data from 1950 to 1995. The runoff of Datong hydrological station can be used to estimate the water discharges into the sea from the Yangtze River in a certain degree as there is no branch inflow from Datong station to the Yangtze Estuary. Two independent techniques were used in the analysis of time series: the conventional periodogram and the maximum entropy spectral analysis. The results reveal that the periods obtained in the time series at Datong station are related to the rainfall characteristics of the Yangtze River to a great extent. The long periods that are more than 10 years may be related to some climatic factors which are influenced by the solar activities. The short periods that are less than 10 years may be related to some factors which are affected by oceanic tides or human activities. The obtained periods not only reflect the periodicity characteristics of the water discharges into the sea from the Yangtze River, but also provide scientific evidence for the study of evolution of Datong reach of the Yangtze River.
Simulation of of 3D Flood Waves by Gas-Liquid Two-Phase Model
Authors: Wei W.L. , Zhao X.J. , Liu Y. L.
Published: December 2012

This paper is concerned with a gas-liquid two-phase model combining with the k–ε turbulent model for numerical simulation of 3D flood waves due to complete or partial dam-break. The flow equations are solved with the finite volume method and solved by the pressure-correction algorithm of the SIMPLE-type. The free fluid surface is simulated by the the volume of fluid(VOF) method. The comparisons with other numerical results show that the proposed method is accurate, reliable and effective in simulation of dam-break flood waves.
Life Cycle Assessment of District Heating Distribution Networks in China — Pipe Production
Authors: Wang Zhao , Li Zhen , Sun Hong Ming
Published: December 2012

In China, the environmental impact from the construction of the distribution system is seldom discussed. In this study, the environmental impacts in production of district pipes are considered. The functional unit used in the study is production of one pipe unit. The studied pipes are: pipe of the dimension DN100, DN200 (Seamless steel tubes) and DN500 (spirally welded steel tubes) with specified length (12m). Based on the concept of the Distance-to-Target weighting method, the total environment load is given. The results can be used to identify environmental significant parts in the actual projects including once more parts of the district distribution system have been investigated with LCA methodology.
Analysis on Dynamic Failure Behaviors of Steel Double-Layer Grids Supported by Circumjacent Steel Columns Used in a Sports Center under Disaster Earthquake Waves
Authors: Li Wei Wei , Li Hai Wang
Published: December 2012

In this paper, the analysis is carried out under EL-centro wave with SAP2000, and the appraisal results on their anti-failure performances are presented based on the plastic-hinge theory. In the analyses, the geometric and material nonlinear effects are considered simultaneously. The plastic development level of the rods, the deformed shape and the failure type and the ductility are estimated. The results show that the failure model of the structure under the earthquake wave action is the complicated combination of strength failure and elasto-plastic dynamic local buckling in deferent areas of the structure; Its critical failure peak acceleration of EL earthquake wave when applied in X directions is 747gal, which is 1.87 times more than the official seismic fortification level of 8 degree (major earthquake, 0.4g) and can be served as earthquake victim shelter in the area of 8 degree seismic fortification; Its displacement ductility coefficient is12.14,which shows the structure owns good energy dissipation capacity.
The Typical Landslide Accelerating Deformation Period Emergency Treatment Engineering Technology and its Effect Analysis
Authors: Xiao Jin
Published: December 2012

As a typical translational landslide, Yangliuya landslide only took a few days to have its deformation intensified from the day it was found, and the precursors of sliding had emerged with the front and back edges of the landslide and cracks at both sides emerging as associated phenomena. How to effectively prevent the landslide in accelerating deformation from further evolving into a disastrous landslide? Based on the comparative analysis on the engineering geological conditions, emergency handling process, emergency engineering measures and deformation evolving characteristics of the Yangliuya landslide, the emergency engineering measures and the effects are assessed in the paper. And theory and practical experience about emergency handling of translational landslide disaster are researched and summarized in this paper through verifying the actual effect of such engineering measures with field monitoring data and numerical simulation analysis to offer a reference for the people to handle similar landslide disasters.
Analytical Behavior of Square Reinforced Concrete Stub Columns under Overall Fire and Axial Compression
Authors: Zheng Yong Qian , Zhuang Jin Ping
Published: December 2012

A finite element model for square reinforced concrete stub column under overall fire and axial compression is developed. The temperature of columns subjected to simulated heating and cooling standard fire and the maximal temperature field were determined. The creep of steel bars, bond slip between steel bars and concrete, transformation of material properties were considered in the force analysis. The deformation under overall fire and the load bearing capacity of the column with initial load after fire are provided.
Key Point of Bridge Damage Caused by Glacial Debris Flows along International Karakorum Highway, Pakistan
Authors: Liao Li Ping , Zhu Ying Yan , Zou D.H.Steve , Yang Zhi Quan , Muhammad Waseem , Chen Ji Ding , Wang Yun , Ye Chen Yin
Published: December 2012

Glacial debris flows along International Karakorum Highway (KKH) connecting northern Pakistan with China, are always causing so extreme threats to a majority of bridges built along KKH. So the improvement project of KKH has been being carried out by China Road & Bridge Corporation in 2008. However it is necessary to collect the detailed data about the damages to bridges and obtain the most dangerous key position. The series of field investigations from 2008 to 2011 demonstrate that the damages are classified into four categories: deposition under bridge, abrasive erosion, impact on piers or abutment and collapse due to buoyancy. Statistics indicate deposition under bridge is the most dominant damage whereas the most serious damage is the impact on piers or abutments. Therefore a case study on key point is made for the typical bridge subjected to impact from Ghulkin glacial debris flow. Finally prevention measures are given.
Types and Primary Characteristics of Coal Mine Water Disaster
Authors: Cui Fang Peng , Wu Qiang , Yu Jin Qing
Published: December 2012

Based on present condition analysis of coal mine water disaster occurred in recent ten years, classification bases such as water source, water passage, water disaster form, economic loss and casualties caused, aging characteristics and spatial distribution relationship between coal seam and water source of the disaster are proposed. According to water sources, the disaster can be subdivided into natural and artificial source coal mine water one. According to water passage, coal mine water disaster can be subdivided into natural and artificial passage one. According to the spatial distribution relationship, it can be subdivided into roof, periphery and floor water inrush disaster. According to damage form, the disaster can be subdivided into normal temperature, abnormal temperature and corrosive one. Based on economic loss and casualties, the disaster can be subdivided into general, larger, great and special great coal mine water disaster. And according to aging characteristics, it can be subdivided into instant, hysteretic, gradual and skipping coal mine water disaster. Finally, typical characteristics of each disaster are analyzed preliminarily.
The Simulation Study for Hydro-Meteorological Hazards Contingency Plan in Henan Highway Network
Authors: Du Yi Man , Wu Jian Ping , Qi Ge Qi
Published: December 2012

The traffic safety in fog area along highway is a worldwide issue. Not only the cost of the injuries and deaths but also the cost of crash involvement by fog is quite large. The rationality and effectiveness of contingency plan for hydro-meteorological hazards is important on reducing the damage to traffic systems. Microscopic simulation models are now widely accepted as the most appropriate analytical tool for understanding traffic capacity problems and for assessing the effectiveness of ameliorative measures. Therefore, the authors have undertaken a simulation study to pre-evaluate the effectiveness of contingency plan in Henan highway network to ensure the effectiveness of traffic organization scheme under hydro-meteorological hazards in Henan highway network. This study illustrated how to assess the effectiveness of ameliorative measures using the microscopic simulation model. The results showed that real-time monitoring and dynamic traffic guidance can better enhance the efficiency of contingency plan.
Smartphone Based Real-Time Location Tracking System for Automatic Risk Alert in Building Project
Authors: Kim Hyeon Jin , Park Chan Sik
Published: December 2012

Effective monitoring of worker is one of the crucial elements in accident prevention. With advancement of sensor technologies, real-time tracking research has been conducted for improving effectiveness of monitoring in safety management. However, most of previous studies were limited to outside construction work which normally indicates excavation and heavy equipment operation. This study proposes automatic worker location tracking and risk alert system for effective risk recognition and worker monitoring that integrates smartphone and Building Information Model (BIM). A prototype system has been developed and tested based on small room. The test results show that the system has the potential to reduce labor and time for monitoring and improve the recognition of fall accident risk on the job site in real-time.
Investigation Role of Sbox to Leakage DPA Information for TDES in FPGA Targets
Authors: Mohammad Kootiani A Zadali , Abedi P
Published: December 2012

Differential power analysis (DPA) attack is an important threat that researchers spend great effort to make crypto algorithms resistant against DPA attacks. In order to determine whether the hardware has DPA leakage before manufacturing, an accurate power model in digital simulation has been generated. FPGAs Arrays are attractive options for hardware implementation of encryption algorithms. In this paper, we show generated power model by using integer numbers whole DES’s rounds vs. S-Box alone, and this method gives more realistic results to determine the effectiveness of the improvements protect whole DES rather than in which only informer elements in the DES round. In particular this allows the user to isolate some parts of its implementation in order to analyze information leakages directly linked to them. We review s-box because it’s get 2kbit or 20% CLB slice from FPGA to implement DES or TDES. This paper try to identify role of Sbox in DPA.
Experimental Study on Stress-Dependent Soil Water Characteristic Curve of a Recompacted Expansive Soil
Authors: Zhang Rui , Zheng Jian Long , Ng C W W
Published: December 2012

In order to investigate stress-dependent soil water characteristic curve of recompacted expansive soil and the changes of soil-water characteristic under vertical stress in terms of soil fabric and pore size distribution, pressure plate tests scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) tests were conducted on a recompacted medium-expansive clay. The test results show that under an applied vertical stress, the air-entry value of a SDSWCC was greater than that of SWCC obtained under zero stress. No distinct hysteresis within a dry-wet cycle of SDSWCC could be found. The change of SWCC of the expansive soil under the applied stress could be mainly attributed to the rearrangement of aggregate and the compression of pores in the soil.
The Rhino Software is Applied in the Computer Simulation Design of Non-Metallic Bulletproof Helmet
Authors: Jin Jiang Chang , Wang Cheng
Published: December 2012

In the paper, the non-metallic bulletproof helmet is analyzed in research. The way can not accurately describe and transmit the shape messages of free-curve and free-camber , in design drawing by hand, design period long and a large amount of work, a large number of data are lose and man-made muff. Advance to use the way combine Rhino software and AutoCAD 2007 software in The Computer Simulation Auxiliary Design of non-metallic bulletproof helmet, raise design level.
New Methods of Evidence Conflict Measurement Based on Conjunctive Combination Rule
Authors: Zhu Jing , Wang Chen Xi , Hu Li Fang , Zheng Yi Cheng
Published: December 2012

In the effective combination of conflicting evidences using the Dempster-Shafer evidence theory, the first step is to reasonably measure the conflict between evidences, but there are limitations in the existing conflict measurement methods. Two new conflict measurement methods based on conjunctive combination rule are put forword, which overcome the limitations of the existing measurement methods. They have four satisfactory properties. Firstly, new methods can measure the total conflict between any pieces of evidence simultaneously, which can satisfy the interchangeability and combinability. Secondly, they overcome the operational problem of the existing binary conflict measurement methods. Thirdly, they are more suitable for people's intuitive logic reasoning. Another, their moderate complexity are easy for project implementation. So new methods have better comprehensive effect under different evidence conditions.
A Preliminary Fragmentation Measure for Software Trustworthiness Based on Imprecise Categorization
Authors: Han Qiang
Published: December 2012

This paper focused on the problem of imprecise categorization of software behavior data, using relative data mining techniques to find determined categorization of software trustworthiness which represents the consistency of software behavior and its claim. In detail, addressing to the measurement method of software trustworthiness mentioned above, this paper propose a new measurement framework for software trustworthiness based on imprecise categorization. We firstly define the formal representation of software trustworthiness according to its definition about imprecise categorization. Secondly, we introduce relative measurement framework about imprecise categorization and its application approaches in measurement for software trustworthiness. Finally, we make the conclusion of this paper and discuss some research area in software trustworthiness in future.
The Study and Experiment of Advance Control of Chaotic Vibration Mill with High Vibration Intensity Based on SCM (II) — The System Construction and the Controlling Methods
Authors: Yang Xiao Lan , Liu Ji Feng , Xiao Zeng Wen , Xu Fang Min
Published: December 2012

A intelligent variable frequency amplitude reduction advance control system whose single-chip-microcomputer act as the core controller is built, and the vibration frequency curve with multiple wave variable sine increase and decrease periodic cycle is applied as the input frequency curve, which made the vibration mill have multiple frequency and amplitude. The control methods are studied, and the operation program is debugged. By using the sensor signal amplification, A/D conversion, on-line monitoring, data mining, and the forecast of the extreme value point of the vibration intensity and its distribution, and then by conducting the judgment, detection, correction and real-time feedback of constraint condition to achieve advance control of vibration intensity over-limit and over-time.
The Method of Unity3D-Based 3D Dynamic Interactive Query of High Arch Dam Construction Information
Authors: Guan Tao , Ren Bing Yu , Zhong Deng Hua
Published: December 2012

Aiming at the problem that it’s hard to get the real construction information during the site management of high arch dam, this paper proposes the method of Unity3D-based three-dimensional (3D) dynamic interactive query of high arch dam construction information. Firstly this paper elaborates the basic theory of this method, and then adopts parametric modeling method to build the Unity3D-Based 3D virtual scene of high arch dam, combines with database technology and programming technology to realize the 3D dynamic interactive query of dam construction information. Finally this research is applied to the construction of a hydropower station high arch dam to build a system of 3D dynamic interactive query of dam construction information. This system achieves the real-time interactive query and analysis of arch dam construction information to provide technical support for site management scientifically.
The SCR Protection Circuit Evaluation in HV DEMOS Devices
Authors: Chen Shen Li , Tseng Chien Chin
Published: December 2012

The electrostatic discharge (ESD) failure of power drain-extended MOS (DEMOS) devices, the protection circuit SCR, and a DEMOS with SCR protection circuit will be investigated in this paper. The ESD immunity of the DEMOS was very poor under the human-body model (HBM) testing. Here we discuss how to design an ESD good SCR device. Eventually, the ESD immunity of DEMOS test sample with an SCR circuit can significantly improve device ESD performance.
Weighted Boundedness of Commutators of Riesz Transforms Associated with Schrödinger Operator
Authors: Gao Wen Hua , Zhou Wei
Published: December 2012

In this paper, the Schrödinger operator on n dimensions Euclid space with the non-zero, nonnegative potential function satisfying the reverse Hölder inequality is considered. The weighted boundedness of the commutators composed of several Riesz transforms associated with the Schrödinger operator and weighted Lipschitz function on weighted Lebesgue integral spaces are obtained, for some weighted function.
Transportation Planning through Pavement Performance Prediction Modeling for Botswana Gravel loss Condition
Authors: Oladele Adewole , Vokolkova Vera , Egwurube Jerome
Published: December 2012

Botswana is a Southern African country with an area of about 582,000 sq. km and its small population of about 2 million people. The road transportation network has grown beyond all expectations since independence in 1966. Out of the 18,300 km Botswana Public Highway Networks, gravel road networks are significant in providing access to rural areas where the majority of the population lives. Modelling of gravel loss conditions are required in order to predict their conditions in the future and provide information on the manner in which pavements perform. Such information can be applied to transportation planning, decision making processes and identification of future maintenance interventions. The results of previous attempts to develop gravel loss condition forecasting models using multiple linear regression (MLR) approach have not been reliable. This paper intended to develop accurate and reliable performance models which best capture the effects of gravel loss condition influencing factors using Feed Forward Neural Network (FFNN) modeling technique. As extension of knowledge in unpaved road transportation network, FFNN trained with Levenberg-Marquardt (L-M) method was used to develop gravel loss performance prediction model for Botswana gravel road networks to achieve a reliable result of a higher coefficient of determinant R2 = 0.94 compared with MLR analysis of R2 = 0.74.
Pricing Mechanism and a Framework of Public-Private Partnership Financing Risk Allocation for Public Rental Project
Authors: Chen Yong Gao
Published: December 2012

Public rental project is a protection scheme putting forward for the low-income currently in China. But its promoting and building face great obstacles because of the constraints of financial resources of government. There is however a critical issue in its application that it’s hard to reach an agreement for risk allocation and operation process between the public and the private sectors, resulting in a relatively longer negotiation period and a higher transaction cost. This paper analyzes firstly factors affecting the risk allocation of PPP public rental project and then discusses the operation process of public rental project under PPP model, and analyzes the pricing mechanism and its safeguards of the model. Conclusions of the study can provide guidance to improve risk allocation in PPP public rental project.
The Review of Risk Management on Subway Station Building
Authors: Chen Gui Xiang , Wang Han Chao , Song Jiu Le , Zhao Yi Qing
Published: December 2012

With the characteristics of large scale, complex construction procedures, surrounding environment and other peculiarity, the subway station engineering is an especially important element for the subway engineering. It is brightly and clearly significant to make an ideal risk management plan of the subway construction to reduce the accident rate and minimum the losses. By integrating the existing research findings, this paper highlighted the idea and process of the risk management. Furthermore, the method on risk management for subway station construction was presented. According to the special characteristics, the merit and pitfall of risk management about subway were also illustrated. Finally, the ongoing research directions for subway engineering were discussed.
Evaluation on Situational Teaching Cases of Mechanical Engineering Project Management
Authors: Men Yu Zhuo , Yu Hai Bo , Wang Hua , Xu Liang , Pan Xin
Published: December 2012

In order to solve the problem of students poor practical ability in project management who major in mechanical engineering, a teaching method with real cases to help students reinforce the vocational skills to enhance the overall quality and practical ability is presented; and assesses the students’ cognition degree of learning mechanical engineering project management in terms of level and process to establish the evaluation model and analyzes the assessment based on the survey data collected from the students. The results show that the situational teaching has obvious effect on prompting students to raise questions, to solve practical problems and to find creative solutions, it can stimulate students’ interest in study, and improve the cognition of the students in the learning of mechanical engineering project management.
Research for the Cost Forecasting of Construction Project
Authors: Cheng Ying Mei
Published: December 2012

Traditional approach to cost forecasting uses a single model for the entire construction period. However, different stages in a construction project require different financial obligations. A better approach to improve the accuracy of cost forecasting is to break the duration of the entire construction project into three stages. It is the attempt of this research to improve the traditional GM (1, 1) Grey Prediction Model by defining the proper  in place of 0.5. The new technique adopts the Golden Section Method to analyze the optimization in defining and build the cost forecasting model for each phase. The results show that the GM (1,1) with proper  can more accurately forecast the expenditure for each month.
The Problems and Improvements of Construction Enterprises Supply Chain Partnership Management in China
Authors: Zhou Die , Peng Ying , Chen Yu Shui
Published: December 2012

Some problems exist in the construction enterprises supply chain partnership management in China, limiting the overall competitiveness of the supply chain. This paper separately analyzed the main problems between the contractor and the supplier: unsuitable supplier selection, limited information sharing, low trust degree; and the main problems between the contractor and the owner: ineffective communication, conflict of interest, excessive risk. Correspondingly, it proposed some measures: select satisfied supplier, enhance information sharing, establish interest allocation mode, take effective incentive; and strengthen effective communication, implement coordination management, raise risk awareness, for the contractor to solve these problems and improve the supply chain partnership management.
Application of Numerical Simulation Experiment in Geotechnical Engineer Teaching
Authors: Feng Wen Juan , Ju Xiao Dong
Published: December 2012

In article we analyzes the conventional experimental method’s characteristic and expatiates the predominance of numerical simulation experiment. The numerical simulation experiment is applied in teaching text in civil engineering school of Henan Polytechnic University and obtained the very good teaching effect. Numerical simulation experiment can simulate routine experiment and get curve and data which can’t be obtained by normal test. Numerical simulation experiment also can simulate large-scale project which can't be done by conventional experiment.
Deep Foundation Pit Engineering Technology Research
Authors: Zhang Xiang Dong , Lv Jin Wei
Published: December 2012

Deep foundation pit engineering is a comprehensive geotechnical problems, has distinct regional. In recent years, it has become the hotspot in geotechnical engineering. The key technology of deep foundation pit engineering rapid development in recent years such as soil test, the design and construction of retaining and protecting, monitoring, dewater. The use of computers in the calculation theory and monitoring technology of deep foundation pit engineering makes two parts have changed in essential. This article discusses the soil test, retaining and protecting technology and principle, the monitoring and dewater of deep foundation pit engineering. The development of deep foundation pit engineering situation and the problems exist of the development of deep foundation pit engineering, which have important meaning to guide the engineering practice and discipline new fields of explore.
Research on the Slope Stability under the Condition of Water Level Fluctuation
Authors: Zhao Er Ping , Jia Xiao Bing
Published: December 2012

The rise and fall of water level has great effect on the slope stability. Based on the saturated-unsaturated seepage theory, the article has an intensive study of the seepage flow field and the change law of the stability safety factor of the slope stability under the condition of fluctuation of water level. The slope stability safety factor is changing in the process of water level’s rise and fall. with the carrying out of the impoundment, slope stability safety factor decreased. The water level rises in the water lever’s rising process. Due to the penetration of water penetration, the reduce of the shear strength of rock and soil, as a result, the slope stability safety factor reduced. as the water level increased gradually, slope stability safety factor increased. After two or three days later, the slope stability safety factor tends to a stable value.
The Choice of Basic Pillar Design Theory for Locked Sand Condition
Authors: Ding Zi Wei , Bagherieh Amirhossein , Feng Rui Min , Wen Xing Xing
Published: December 2012

Because of unique properties of locked sand (very high friction angle and very low cohesion), a new pillar design method based on present basic pillar design theories must be developed. Wilson theory puts its focus on confining pressure, which is related to friction angle and cohesion. Triaxial tests results show that locked sand at Pattison mine has an average friction angle of 57°, which means the strength of the material increases rapidly with the confining pressure, and average cohesion of 2.6 MPa. Results show that choosing Wilson theory as basic pillar design theory not only considers the high friction angle of locked sand, but also minimizes the effects of Wilson’s hypothesis of neglecting the unconfined strength.
Study on Stress and Deformation of Earth-Rock Cofferdam and Concrete Cutoff Wall on Deep Overburden
Authors: Liu Hai Wei , Dang Fa Ning , Min Yi
Published: December 2012

The earth-rock cofferdam on deep overburden is the main study object. The cofferdam filling and dam excavation process were numerical simulated using FEM code ANSYS .Main research focused on stress and deformation characteristic of cofferdam and concrete cutoff wall during completion and excavation process.Analysis showed that displacements of cofferdam and cutoff wall distribute well in x, y, z directions with acceptable magnitude, stress characteristic values are less than design standard. The results indicate that cofferdam and cutoff wall are safe and stable both in construction and operation.
Variable Rigidity Pile (Pile Partner) Deal with Unconfined Direct and Indirect Footing (Foundation)
Authors: Xue Jiang Wei , Cai Jing Luo , Yang Yong , Ge Xin Sheng
Published: December 2012

To classify building founation into shallow foundation and deep foundation is not always right, may lead to erroneous judgement or discrimination, and it is difficult to define the pile partner (Variable Rigidity Pile), so the concepts of direct and indirect footing (foundation) are to be presented for the first time, which seems to be more reasonable and scientific, pile partner can be directly foundation, and can also be indirect foundation, mainly distinguish according to the distance or modulus between pile top and pile cap. If the pile top and pile cap keep at a distance, then it is direct foundation (footing); If the pile top connect to pile cap, connection types can be "rigid joint", "hinged joint", or contact with each other, it is indirect foundation (footing).
Research on Hydraulic Soil Slope Frost Heaving Damage Model Test
Authors: Zhong Hua , Wang Xiu Fen , Zhang Bin
Published: December 2012

Frost heaving damage of water conservancy project is widespread. In order to research the failure problems of hydraulic soil slope in dark seasonal frozen soil region, laboratory model test is carried out combined with field test section practical situation, which is the prototype of this model test. It is researched that the rule of frost heave parameters variation and the damage of soil slope during freeze-thaw cycling. That offers theoretical basis and reference for construction of water conservancy project, which will mitigate the effect and damage of freeze-thaw on hydraulic soil slope stability.
Finite Element Analysis of the Pile-Cap of Laterally Loaded Variable Rigidity Pile (Pile Partner)
Authors: Xue Jiang Wei , Song Ning , Yang Yong , Ge Xin Sheng
Published: December 2012

Concerning the stress and displacement of the cap under lateral load with or without pile partner, reference on PCC lateral load test and numerical simulation, build finite element model of a pile under lateral load to study the stress and displacement of the cap, calculations show that the diffusion effect help partner to reduce stress concentration of the pile cap, and foundation slab can be designed thinner if there are pile partners.
A Study on Bearing Characteristics of Horizontally-Loaded Short Piles in 750kV Transmission Line on Loess Foundation
Authors: Cui Qiang , Yang Wen Zhi , Liu Sheng Hui , Lu Xian Long
Published: December 2012

For the angle tower foundation of 750kV transmission line, the overturning effect caused by wire tension is a control factor of tower foundation design. The pile foundation on loess was taken as a research object in this study, where two typical regions along 750kV Lanzhou - Tianshui - Baoji transmission line were selected to carry out the site full-size horizontal static load test. Through the arrangement of displacement sensors and earth pressure cells around piles, the load-displacement curve of pile lateral soil under horizontal loads was obtained as well as the distribution law of soil stress at different locations of the pile. Based on the "m" method, the soil stress at different locations of the pile was calculated. The results showed that the calculated results were well consistent with experimental results. This research work can provide a theoretical basis and design guidance for tower foundation selection and design optimization of 750kV transmission line.
Buckling Analysis of Pile during Hammer Placement
Authors: Guo Shao Zeng , Liu Run
Published: December 2012

Large diameter and thin thickness are the main characteristics of the steel pipe piles in offshore engineering. Before piling a pile, heavy hammer will be placed on the top of it, which may emerge a serious risk in pile buckling. A three dimensional finite element model of pile and soil was established for a case study. The modified Riks method which can automatically search a suitable increment factor of loads is adopted to assess the stability of the pile, and the geometric nonlinearity and pile-soil interaction were both considered. The practical example shows that the critical load considering pile-soil interaction is much smaller than that in a fixed constraint.
The Calculation of Incremental Method Based on Earth Pressure Modification
Authors: Cheng Shou Ze , Wang Wei Hua , Xu Chang Jie
Published: December 2012

Incremental method, as one of the practical calculation methods in retaining structure design of foundation pit, has been widely used. When incremental method is applied, the earth pressure, acting on the retaining structure on each incremental step, is considered as static earth pressure. Actually, the state of earth pressure changes constantly with the increase of soil displacement in the process of excavation. This paper introduces the relation of displacement and earth pressure based on the soil stress-strain state, and makes corrections for the earth pressure of the incremental method. By comparing with the measured data of the engineering, the calculation results, which consider earth pressure modification, are in good line with the practical engineering condition. The method in this paper can provide certain reference for related engineering design.
The Application Example Analysis of Several Types of Composite Foundation in ChangChun Area
Authors: Wu Yao Dong , Zhang Li Lan
Published: December 2012

In this article, we analyse several types of composite foundation load test result, then expound that when we design composite foundations, we should choose reasonable kind of composite foundations according to accurate engineering geology and hydrogeology conditions and characteristic of buildings , otherwise will not reach the expected effect.
The Analysis of Surface Subsidence Caused by Pipe Roof Reinforcement Method Construction in Hunhe Underdrain
Authors: Zhang Xiang Dong , Li Qing Wen , Gu Xue Bing , Li Gui Xiu
Published: December 2012

This paper is used to study on analysis and prediction of surface subsidence caused by pipe roof reinforcement method construction. Take one of the Shenyang's sewage disposal projects to be investigated, it monitored on field surface subsidence in construction of underdrain. During the measurement and monitoring, except for conventional measurement of surface subsidence according to code and peripheral convergence and so on, in order to analysis changes of stress and strain of the pipe roof in whole construction of underdrain. it respectively arranges JMZX-212 intelligent string type of strain gauge in both internal and external sides of vault and hance. It used the Element Birth/Death of finite element software basing on field data, using elastic-plastic and nonlinear finite element method. Material constitutive relationship used mohr-coulomb model, simulating process of tunnel of excavation and support, researching and stimulating surface subsidence. Value of surface settlement was calculated via numerical simulation in applying finite element theory, it based on prototype of engineering, which was in accord with measurement value in field. The correctness of soil constitutive model chosen and boundary conditions used is verified, meanwhile, numerical simulation shows validity of method.
Research on Multiple Holes Grouting of Fractured Rock Mass
Authors: Xu Yong , Peng Wei Hong
Published: December 2012

Considering the seepage stress coupling of fractured rock mass, the multiple holes grouting problems were simulated to analyse the spread regularity by Universal Distinct Element Code(UDEC).The results show that the correlation between grouting pressure and the diffusion distance is positive, whereas the correlation between ground stress and diffusion distance is negative; With the raising of grouting holes, the diffusion distance is increasing and becoming more uniform in all directions, and the grout pressure and saturation is falling and attenuation amplitude is decreasing along the direction of grout diffusion; With the increasing of fracture aperture, the grout diffusion distance is increasing, and the grout pressure and saturation attenuation amplitude is decreasing along the direction of grout diffusion.
Study on Antifouling Properties of Clay in Unsaturated Zone in Xiaodian District of Taiyuan City
Authors: Li Xiao Niu , Zhou Xiao De
Published: December 2012

The characteristics and distribution rule of viscous soil in unsaturated zone is the key factor that influence on the natural attenuation of pollutant, so, it is necessary to study the antifouling performance of cohesive soils. In this paper, the barrier adsorption effect of COD (Chemical Oxygen Demand) and TDS (Total Dissolved Solids) were discussed according to soil column experiment. Meanwhile, it analyzed the impact of some properties of viscous soil on experimental result, such as initial PH, initial moisture content, initial organic matter and microorganism content. Research results are shown as follows. Firstly, initial moisture content is passively correlated with the adsorption of TDS. Secondly, organic matter content is positively correlated with the adsorption of COD. Thirdly, microorganism content is positively correlated with the adsorption of COD and TDS. The Antifouling ability of soil may be evaluated by means of filtration capability and adequacy thickness. Research results would provide basis for pollution control of soil.
Finite Element Method for Analysis of Flexural Vibration Propagating in Ternary Phononic Crystal Thin Plates
Authors: Yao Zong Jian , Yu Gui Lan , Wang Yue Sheng
Published: December 2012

Propagation of flexural vibration in a ternary phononic crystal thin plate with a point defect are explored using finite element method. The thin concrete plate is composed of steel cylinders hemmed around by rubber with a square lattice. Absolute band gaps, point defect bands and transmission response curves with low frequency are investigated. Comparing the results of finite element method with that of improved plane wave expansion method, precise identifications are obtained to identify the point defect states. The results show that the finite element method is suitable for the exploring of flexural vibration propagating in ternary phononic crystal thin plates.