期刊：
NEW TRENDS IN FLUID MECHANICS RESEARCH: PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON FLUID MECHANICS,2007年:601-601
通讯作者：
Pei, G. H.
作者机构：
[Liu, X. G.] Chinese Acad Sci, Inst Porous Flow & Fluid Mech, Langfang 065007, Peoples R China.;[Pei, G. H.] Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Hubei, Peoples R China.
通讯机构：
[Pei, G. H.] W;Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Hubei, Peoples R China.
摘要：
Precise numerical simulation to seepage zone is a significant part of water power project. The accuracy of numerical analysis to seepage zone depends on both the simulation extent of the numerical model and parameter determination. At the present, the mathematical seepage model is, to a large degree, perfect, but the parameter determining; especially the permeability coefficient is far from perfect. Indoor experiments measuring permeability coefficient is easily influenced by the sample uncertainty and scale effect. Permeability coefficient got from field test is relatively accurate, but the precision of result depend on the number and distribution of test points. By increasing the number of test points, the precision is improved. Correspondingly, the cost rises. It is a new manner to inverse the rock permeability coefficient through numerical model. The basic idea is set a numerical model of seepage field, by fitting the dynamic information (such as head, flux) of the movement of ground water to inverse the permeability coefficient of rock mass. Parameter got through inversion can reflect the seepage characteristics of the rock mass of target zone. But inversion methods exist two difficulties: result indeterminacy and heavy load of calculation. Genetic algorithm developed from simulating life evolution system is a searching algorithm. Its applications in rock project and geophysics suggest that it can overcome indeterminacy of inverse problem. The biggest difficulty of genetic algorithm when used to parameter inversion is that its searching space is huge and the convergence speed is slow, which will result in too much calculation in the process of inversion. In order to overcome this defect, a mixed algorithm is established through the combination of genetic algorithm and optimistic method. As an improvement, this paper based on genetic algorithm is about permeability coefficient inversion, a global optimism of inversion result is assured. At the same time, in the process of inversion, some characteristics of seepage are considered, and a local searching process is added to establish a mixed algorithm to reduce searching space and increase convergence speed. The application of the algorithm in the permeability coefficient inversion of a gravity dam site indicates that the optimism of inversion result is efficiently assured and, hence, the uniqueness of solution, but also quicken convergence and reduce calculation burden.
摘要：
The resource constrained project scheduling problem (RCPSP) is extended to flexible resource constrained project scheduling problem (FRCPSP) in this paper. Resources are assumed to have certain capabilities demanded by project activities, but not necessarily all of them. Resource capability matrix (RCM) is proposed to represent flexible resources. A multi-agent system composed of resource agent, activity agent, and service agent is put forward as an information infrastructure to support flexible resource constrained project management in a highly distributed environment. The definitions of component agents and the strategies of flexible resource allocation are discussed.
摘要：
A spare optimization model for systems with components in series where the failure time of components follow any general distribution is presented. The availability of the system at any time is obtained through renewal process theory. The objective of the optimization problem is to maximize the availability of the system satisfying constraints on cost and volume. Genetic algorithms are used to find the optimal amount of spares for each component. Finally, an illustrative example is given.
作者机构：
Institute of Porous Mechanics, Wuhan Polytechnic University, Wuhan 430023, China;Institute of Rock and Soil Mechanics, Chinese Acad. of Sci., Wuhan 430071, China
通讯机构：
Institute of Porous Mechanics, Wuhan Polytechnic University, China
摘要：
In order to find out the rule of pressure distribution of landfill gas (LFG) in landfill with single vertical extraction well, a comprehensive three-dimensional (3D) model of gas generation and transport in landfills is developed based on Monod equation, hydrodynamics in porous media, and seepage theory of gases. The governing non-linear equation of mass transport and reaction is solved by finite deference method. Simulation results show that under the condition of single extraction well with negative pressure, landfill gas gathers around extraction well, where there is a prominent pressure increasing. However as the time goes on, the generation of LFG turn to be stable with the mitigating of the increasing of LFG, which is due to the consuming of organic components and the forming of anaerobic environment in landfill. The model could be utilized for investigating gas generation and transport in landfill, and the analysis on pressure distribution under the condition of single extraction well is also significant to the designing and building of the LFG recovery systems.
作者机构：
[涂建维; 瞿伟廉] Hubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, Wuhan 430070, China;[戴葵] Department of Civil Engineering, Wuhan Polytechnic University, Wuhan 430023, China
通讯机构：
Hubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, China
摘要：
It was conducted that concrete experiments in tension on static and fatigue under multilateral pressures which are 0.25 fc and 0.50 fc respectively, and combined of them. The characteristic curves of strain and ratios of deformation modulus with the number of cycles are transformed into lines, A computation flow is also developed for finding the best fatigue equation, static and fatigue behaviors of concrete in tension are compared in the end, that is that ultimate cumulative strains of fatigue are equivalent with static peak strains, and fatigue lives decrease 1 to 3 order-of-magnitude under two neighboring stresses, and ratios of fatigue deformation modulus reduce 95%-65% for uniaxial, 85%-50% for biaxial, 80%-40% for triaxial under the same pressures.
摘要：
At the present time, the mechanics of seepage in fracture-cavity carbonate reservoir is not very clear. Fracture-cavity carbonate reservoir was simplified as regular fracture-cavity net model and rules of seepage in it were studied by numerical simulation based on Navier-Stokes equation (N-S equation). Results showed that flux exponentially Increased along with the Increase of fracture width but flux and diameter of cavity had linear relationship; the seepage in fracture-cavity also obeyed the Dairy's law, bnt the permeability was bigger than the fracture model's, which represented different performance of flow; fracture width had more impact to seepage than diameter of cavity.
作者机构：
Department of Civil Engineering,Wuhan Polytechnic University,PR China,430023
会议名称：
2007 International Conference on Management Science and Engineering(2007管理科学与工程国际学术会议)
会议时间：
2007-08-20
会议地点：
河南焦作
会议论文集名称：
2007 International Conference on Management Science and Engineering(2007管理科学与工程国际学术会议)论文集
关键词：
Measures;Human resource management (HRM);State-Owned construction firms
摘要：
Human Resource Management is one of the most crucial elements of an organization's success.While at present,the state-owned construction firms in China are facing problems in utilizing the asset of human resource to enhance their competition capabilities.This paper introduces the HRM State Quo of state-owned construction firms in China and analyzes the reasons of the inefficiency.At the end,the paper puts forward some key measures to improve the HRM,including strategic planning for HRM,fostering labour markets of various levels,reasonable rules & regulations,education and training,complete performance evaluation system and learning atmosphere within the firm.
期刊：
PROCEEDINGS OF THE 2007 INTERNATIONAL CONFERENCE ON AGRICULTURE ENGINEERING,2007年:142-145
作者机构：
[Chao, Meng; Liu Jianjun] Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Peoples R China.
会议名称：
2007 International Conference on Agriculture Engineering(2007年农业工程国际会议)
会议时间：
2007-10-20
会议地点：
河北保定
会议论文集名称：
2007 International Conference on Agriculture Engineering(2007年农业工程国际会议)论文集
关键词：
single well;perforated;seepage;numerical simulation;flow conductivity;water output
摘要：
Perforation in the wall of well is a new approach to raise the water output from the single well, and it can improve the flow Conductivity. The numerical model of seepage in the aquifer was built based on the theory of seepage mechanics, and numerical simulation by COMSOL Multiphyics was done to analyze seepage law in perforated well. It provides the theory for raising the water output from a single well.
摘要：
Based on the S-N relationship and statistical property of concrete static strength, a function of fatigue life of concrete, 1//(a-blogN), is found to follow the normal distribution. Thus a new probabilistic model of fatigue life distribution of concrete is presented in this paper. The model connects statistical properties of static strength and fatigue life of concrete together in theory, so it is of clear physical meaning, An experiment was conducted. The experiment was a part of the project of The State Natural Science Foundation-Failure Criterion of Plain Concrete Under Multiaxial Fatigue Loading, Χ<sup>2</sup>-test and Kolmogorov-Smirnov test are employed to test the proposed model. Fuzzy optimization is used to compare the model with lognormal distribution. Χ<sup>2</sup>-test, Kolmogorov-Smirnov test and fuzzy optimization are also conducted for test data from references. The results show that the new model is more flexible to fit test data.
作者机构：
[Liu, Lei; Yang, Yong; Liu, Jian-Jun; Xue, Qiang] Institute of Porous Mechanics, Wuhan Polytechnic University, Wuhan 430023, China;Institute of Rock and Soil Mechanics, Chinese Acad. of Sci., Wuhan 430071, China
通讯机构：
Institute of Porous Mechanics, Wuhan Polytechnic University, China
摘要：
The mutual action among the complex geological environments in which surrounding solid waste is situated cannot be ignored anymore. Based on Darcy's law and the principle of effective stress and the dynamics of fluids in porous media, a multi-field coupled model of settlement in landfill is established. The numerical visualization simulation on the distribution law of settlement in landfill has been presented by finite element method. The results show that the settlement of landfill soil is fast with couple effect and the effect of coupling cannot be ignored. The theory evidence is provided for forecasting settlement of landfill quantitatively, which has important theoretical significance and practical use-value for the storage capacity and stabilization in landfill.
作者机构：
[刘建军; 薛强; 纪佑军] Institute of Poromechanics, Wuhan Polytechnic University, Wuhan 430023, China;[刘建军] Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
通讯机构：
Institute of Poromechanics, Wuhan Polytechnic University, China
作者机构：
[刘建军; 徐书平] Department of Civil Engineering, Wuhan Polytechnic University, Wuhan 430023, China;[刘祖德; 凡红] School of Civil and Architectural Engineering, Wuhan University, Wuhan 430072, China
通讯机构：
Department of Civil Engineering, Wuhan Polytechnic University, China
期刊：
NEW TRENDS IN FLUID MECHANICS RESEARCH: PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON FLUID MECHANICS,2007年:592-592
通讯作者：
Liu, J. J.
作者机构：
[He, X.; Liu, J. J.; Pei, G. H.] Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Hubei, Peoples R China.;[Liu, X. G.] Chinese Acad Sci, Inst Porous Flow & Fluid Mech, Langfang 065007, Peoples R China.
通讯机构：
[Liu, J. J.] W;Wuhan Polytech Univ, Inst Poromech, Wuhan 430023, Hubei, Peoples R China.
摘要：
Casing damage has become a very serious concern in China since 1970s. Along with adoption of high-pressure water injection and high pressure hydraulic fracturing in oil fields, casing damage become a challenging technical difficulty in the Chinese and international petroleum industry. Many researchers have been devoted to solve the problems and had identified important factors affecting casing damage. such as geologic structure, development operation and drilling program. Although stress concentration around well bore is the direct reason of casing damage, it is the flow field change that induced geostress redistribution. Therefore, it is necessary to study the fluid-solid coupling during oil development to identify casing damage mechanisms. According to the casing damage characters, casing damages induced by seepage can be classified into three kinds: shear-sliding damage, tension damage, and squeeze damage. Shear damage is induced by geologic fault slippage because water or oil flow into fault, and intenerates the mechanical parameters. When porous pressure increases to critical value, fault will slippage, and cause casing collapse. Tensile damage is induced by vertical strata displacement. When large volume water is injected into reservoir. porous pressure rises, and leads to strata elevated. If the exceeds the casing’s tensile strength, casing pipe will be destabilized. Extrusion casing damage is induced by large pressure gradient around the well bore as a pressure releasing effect in the water injection wells. Based on fluid-solid coupling theory, the authors analyzed the mechanism of the 3 kinds casing damage and presented mathematical models. Using 3-D finite element method, the authors simulated the rock deformation patters causing casing damages in Daqing oil field, China, during water-flooding operations. According to the simulation results, some technical measures and critical injection pressure to prevent casing damage are given in the end for Daqing oil field.
摘要：
According to seepage Darcy's law and Burkley-Leverret equations, mathematical model to simulate saturated-unsaturated seepage was deduced. Based on immune evolution algorithm, the authors simulated typical side slope seepage in Longtan hydropower station. Simulation results show that fractures and grading angle are seepage pressure concentration regions, where seepage pressure gradient is larger than other region and is much more easily to destabilize.
摘要：
Administrative guidance has been playing an important role in the economy and social life of our country. Because of the special statue, it is constantly causing fierce debating. The research of law o
