硬岩的复合黏弹塑性流变模型  

Composite viscoelasto-plastic rheological model for hard rock

作　　者：熊良宵[1,2] 杨林德[2] 张尧[2] 

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《中南大学学报（自然科学版）》2010年第4期1540-1548,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金;雅砻江水电开发联合研究基金重点资助项目(50639090)

摘　　要：基于应变软化模型得到塑性元件,将该塑性元件与六元件黏弹性流变模型组合得到适合于硬岩的复合黏弹塑性流变模型。采用FLAC3D所提供的二次开发接口程序,开发复合黏弹塑性流变模型的数值程序,对锦屏二级水电站的绿片岩单轴压缩蠕变试验曲线进行拟合,采用拟合得到的参数进行计算以验证接口程序的正确性,并对锦屏二级水电站辅助交通洞进行工程流变计算分析。研究结果表明:复合黏弹塑性流变模型具有程序可置入性,采用该模型进行计算时,计算值与理论值完全一致,从而验证了接口程序的正确性;辅助交通洞开挖后,围岩体的最大变形出现在边墙位置,随着时间的增加,边墙位置处围岩体内的位移和最大主应力呈增加的趋势。A plastic component was built based on strain softening model,and composite viscoelasto-plastic model for hard rock was obtained as the combination of six-component viscoelastic rheological model with this plastic component.By adopting the secondary development routine interface of FLAC3D,the numerical analysis codes of composite viscoelasto-plastic model were developed,and calculation was done by using the identified parameters of uniaxial compression creep test curve of green schist specimen from Jinping Second Stage Hydropower Station.In the end,the numerical analysis was conducted for auxiliary tunnel at Jinping Second Stage Hydropower Station.The research results show that numerical codes are easy to be embedded into composite viscoelasto-plastic model,and the interface codes for this model are verified by the agreement of calculation result with theoretical result.The distortion of surrounding rock near the side wall is the largest after auxiliary tunnel is excavated.The displacement and maximum principal stress of surrounding rock near the side wall increase with time.

关 键 词：六元件黏弹性流变模型 复合黏弹塑性流变模型 FLAC3D 绿片岩 单轴压缩蠕变试验 

分 类 号：TU452[建筑科学—岩土工程]