基于ABAQUS大型地下洞室群分期开挖动态模拟  

Dynamic simulation of large underground caverns stage excavation using ABAQUS

作　　者：陈浩[1,2] 肖明[1,2] 衡为方[1,2] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2013年第3期321-327,共7页Engineering Journal of Wuhan University

基　　金：国家重点基础研究发展计划973项目(编号:2010CB732005);国家自然科学基金资助项目(编号:51279136;51209164)

摘　　要：基于三维弹塑性有限元数值计算理论,借助ABAQUS/standard求解模块分析大型地下洞室群分期开挖围岩稳定.利用"生死"单元将地下洞室开挖问题转换成简单的加载问题,从而实现分期开挖问题的动态模拟.建立如美水电站地下厂房三维有限元模型,初始地应力三维有限元反演,二次平衡岩体初始地应力,得到初始应变为零且位于屈服面内的初始应力场.采用D-P弹塑性岩体本构模型,计算了分期开挖过程中位移场、应力场并分析了其分布规律.利用面向对象编程语言Python编写脚本访问结果数据库,重新定义各类破坏区.借助ABAQUS自带的插件程序,创建新的后处理模块,拓展了ABAQUS后处理功能.Based on three-dimensional elastoplastic finite element theory,the surrounding rock stability of large underground caverns stage excavation has been analysed by using ABAQUS/standard solvers.An issue of underground cavern stage excavation is turned into a series of questions of simple load by means of birth-death element method and dynamic simulation of stage excavation is realized.A 3D finite element model of Rumei hydropower station is established.By three-dimensional initial geostress finite element inversion and rock mass stress balance for two times,the initial stress field that are located in yield surface inside is obtained and its initial strain is zero.Displacement field and stress field are calculated in different steps of stage excavation by means of elastoplastic constitutive model;and regularities of their distributions are also analysed.Script was edited to access database of output by object-oriented programming language Python,then all kinds of destruction area are defined again.A new post module is created by plug-in brought in ABAQUS and the new module expand the function of ABAQUS postprocessing.

关 键 词：有限单元法 ABAQUS 围岩稳定 生死单元 开挖模拟 Python脚本 

分 类 号：TU923[建筑科学—建筑设计及理论]