基于温控参数折减有限元法的水库进水塔-地基结构稳定分析  

Stability Analysis of Reservoir Intake Tower-base Structure Based on Temperature Driving Parameters Reduction FEM

作　　者：宫经伟[1] 周宜红[1] 严新军[2] 徐千军[2,3] 侍克斌[2] 

机构地区：[1]武汉大学水资源与水电工程国家重点实验室,湖北武汉430072 [2]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052 [3]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《四川大学学报（工程科学版）》2011年第4期21-26,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家"十一五"科技支撑计划资助项目(2008BAB29B02-2-2)

摘　　要：针对边坡稳定分析中采用的强度折减有限元法,提出用温度场控制强度参数折减和变形参数调整的有限元法,对结构复杂的水库进水塔-地基3维结构进行稳定分析,较于传统的强度折减有限元法大大提高了计算效率。用考虑变形参数调整和不考虑变形参数调整的温控强度折减有限元法,分别对算例进行分析,并将其和水压超载法计算进行对比计算,综合不同部位测点的位移时程线、结构中等效塑性应变分布变化和计算的敛散性,从多个角度判定结构的极限状态,得出结构的安全系数,分析结构失稳的可能原因。计算结果表明:考虑变形参数调整的温控强度折减有限元法计算结果更合理,与水压超载法的计算结果有着较好的一致性。On the basis of slope stability due to gravity based on strength reduction FEM,temperature driving strength reduction FEM considering deformation parameters modification was proposed for the stability analysis of 3D reservoir intake tower-base complex structure,which was more efficient than traditional strength reduction FEM.Temperature driving strength reduction FEM considering and not considering deformation parameters modification was applied to analyze the reservoir intake tower-base complex structure under the given conditions,respectively,and a comparison with the method of overloading hydraulic pressure was carried out,By getting the curves of currentwise displacement vs.time of nodes in different place,tracing the variation of equivalent plastic strain of the whole structure and the convergence or disvergence of the computation,the factor of safety and the possible factor that may lead the collapse of the structure were gained.The analysis results showed that the calculated results gained from temperature driving strength reduction FEM considering deformation parameters modification was more reasonable,and closed to that from overloading hydraulic pressure method.

关 键 词：温控参数折减有限元 φ-ν不等式 极限状态 安全系数 失稳原因 

分 类 号：TV311[水利工程—水工结构工程]