作者机构：
Institute of Poromechanics, Wuhan Polytechnic University, Wuhan, 430023 China;Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang, 065007 China
会议名称：
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
摘要：
Oil or water well casing damage is a hard technical problem to oil reservoir engineers. The paper discussed the mechanical mechanism of different kind of casing damage based on the fluid-solid coupling theory, and presents mathematical models for casing damage forecasting. Using 3-D finite element method, the authors simulated the casing deformation in Saertu development unit of Daqing oil field during waterflooding operation. According to the simulation results, the authors advanced some technical measures to prevent casing damage.
摘要：
The efficient tracking of visual objects in complex environments is a challenging task for the vision community. In a real-rime particle filter tracking, the particles are a constrained resource and should be well used. From the aspect of efficiently exploring the state space, a new particle filter method named detection based particle filter to the real time tracking of non-rigid objects are proposed. This method evenly spread particles in the possible state space at each time step, and keeps a minimum particle number in each possible target region. Color clues are used in this method. Experimental results show that this method can achieve good performance and need smaller particle number compared with sampling importance resampling (SIR) particle filter.
摘要：
An understanding of the dynamic behavior of trace elements leaching from coal mine spoil is important in predicting the groundwater quality. The relationship between trace element concentrations and leaching times, pH values of the media is studied. Column leaching tests conducted in the laboratory showed that there was a close correlation between pH value and trace element concentrations. The longer the leaching time, the higher the trace element concentrations. Different trace elements are differently affected by pH values of leaching media. A numerical model for water flow and trace element transport has been developed based on analyzing the characteristics of migration and transformation of trace elements leached from coal mine spoil. Solutions to the coupled model are accomplished by Eulerian-Lagrangian localized adjoint method. Numerical simulation shows that rainfall intensity determined maximum leaching depth. As rainfall intensity is 3.6ml/s, the outflow concentrations indicate a breakthrough of trace elements beyond the column base, with peak concentration at 90cm depth. And the subsurface pollution range has a trend of increase with time. The model simulations are compared to experimental results of trace element concentrations, with reasonable agreement between them. The analysis and modeling of trace elements suggested that the infiltration of rainwater through the mine spoil might lead to potential groundwater pollution. It provides theoretical evidence for quantitative assessment soil-water quality of trace element transport on environment pollution.
作者机构：
[陈记文] Department of Civil Engineering, Wuhan Polytechnic Institute, Wuhan 430023, China;[刘磊; 赵颖; 薛强] Institute of Rock and Soil Mechanics, Chinese Acad. of Sci., Wuhan 430071, China;[陈记文] Tangqiao Project in Shanghai, Zhongtie Bureau Eleven in Pinghu City of Zhejiang Province, Pinghu 314200, China
通讯机构：
Department of Civil Engineering, Wuhan Polytechnic Institute, China
摘要：
In order to study the behavior of fatigue crack propagation under random overloads, a Monte Carlo simulation scheme is proposed. Overloads of Poisson flow with uniform distribution on base-line constant-amplitude cyclic loads are considered. The retardation effect of overload is taken into account using crack closure model and the crack opening stress level is assumed to vary linearly in the yield zone produced by the overload. The fatigue crack growth curve from initial crack size till fatigue failure is simulated step by step. Through the large number of the simulated samples, the average fatigue crack propagation life is calculated. Finally, the influence of overload intensity and magnitude on fatigue crack propagation life is studied.
作者机构：
[方坤河; 杨健辉] State Key Lab. of Water Resources and Hydropower Eng. Sci., Wuhan Univ., Wuhan 430072, China;[宋玉普; 杨健辉; 赵东拂] State Key Lab. of Coastal and Offshore Eng., Dalian Univ. of Technol., Dalian 116023, China;[赵东拂] Dept. of Civil Eng., Beijing Inst. of Civil Eng. and Arch., Beijing 100044, China;[邹小理; 杨健辉] Dept. of Civil Eng., Wuhan Polytechnical Univ., Wuhan 430023, China
通讯机构：
[Yang, J.-H.] S;State Key Lab. of Water Resources and Hydropower Eng. Sci., , Wuhan 430072, China
作者机构：
[徐书平] Department of Civil Engineering, Wuhan Polytechnic University, Wuhan 430023, China;[司马军; 刘祖德] School of Civil and Architectural Engineering, Wuhan University, Wuhan 430072, China
通讯机构：
Department of Civil Engineering, Wuhan Polytechnic University, China
摘要：
Foundation with inserted angle steel has been used in electrical transmission steel tower, the bond performance between angle steel and concrete is the key of transmission power. Based on the experimental study of bond performance between steel angle and concrete at home and abroad, influencing factors on the bond performance between steel angle and concrete were analyzed. The calculating method of basic anchorage length was presented at various grade concrete. Based on the study of attached anchor effect, some optimizing design suggestions on anchor are presented. All these are useful for foundation design.
作者机构：
[李继祥] Department of Civil Engineering, Wuhan Polytechnic University, Wuhan 430023, China;[张家生; 贺建清] School of Civil Engineering and Soil Architecture, Central South University, Changsha 410075, China
通讯机构：
Department of Civil Engineering, Wuhan Polytechnic University, China
