有限元法中开挖释放荷载计算方法的研究  

The study of calculation method of excavation unloading in finite element method

作　　者：王小敏[1] 朱爱军[2] 王宏润[1] 杨世忠[1] 

机构地区：[1]贵州大学土木工程学院,贵州贵阳550003 [2]重庆大学土木工程学院,重庆400045

出　　处：《水力发电》2005年第7期48-50,共3页Water Power

摘　　要：对传统有限元开挖释放荷载的计算方法进行了讨论与分析,并基于体系平衡的有限元数值格式,提出开挖作用的直接分析法、间接分析法的概念及开挖不平衡力的计算方法。开挖作用的直接分析法认为,任何开挖步产生的位移都是该开挖步剩余构形中真实存在的各种力相互作用的结果,不用考虑被卸除材料部分对体系的作用,其对开挖问题的数值模拟只针对开挖剩余体系进行计算,其意义更为直观,计算更为简便可靠。This paper discusses and analyzes the traditional calculation method of excavation unloading of finite element method，The conception of direct analysis method and indirect analysis method and the calculation method of excavated disequilibrium stress are proposed, based on the finite element method numerial form of system balance. The direcrt analysis method of excavation believes that the displacement that any excavation step produced is the result that the authentic kinds of stress interact in remained part of excavation step. This method doesn＇t consider the effect that material taken away to system interact any more and only compute the system of remains in numerical modeling of excavation. Its meaning is more direct and the calculation method is more reliable and simple。

关 键 词：有限元法 开挖 开挖释放荷载 直接分析法 间接分析法 

分 类 号：TU312.1[建筑科学—结构工程] O241.82[理学—计算数学]