锚固节理岩体等效力学参数三维离散元模拟  

3DEC modeling of equivalent mechanical parameters in anchored jointed rock mass

作　　者：程东幸[1] 潘炜[1] 刘大安[1] 冯树荣[2] 郭华锋[1] 丁恩保[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]国家电力公司中南勘测设计研究院,长沙410014

出　　处：《岩土力学》2006年第12期2127-2132,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.40472145);中科院知识创新项目(No.KZCX2-SW-134)资助

摘　　要：节理岩体是工程边坡的重要研究对象,通过数值模拟(3DEC)的方法研究了加锚节理岩体的力学特性。以龙滩水电站左岸边坡的锚固设计为例,推导了边坡加锚节理岩体的等效力学参数,进行了岩石数值单轴压缩试验、直剪试验以及岩体结构面直剪试验,对数值试验的结果进行了误差分析和修正,确定出加锚节理岩体的等效力学参数为:岩石的变形模量、内摩擦角、内聚力不变,结构面的内摩擦角不变,内聚力由50 kPa提高到122 kPa。所得结论与采用物理试验的试验结果相符,验证了用数值模拟方法进行岩石力学试验的可行性和可靠性。Jointed rock mass is an important study object of engineering slope. The mechanical features of anchored jointed rock mass are studied by numerical modeling （3DEC）. Taking the anchors of left bank slope of Longtan Hydropower Station in Guangxi Autonomous Region for example, the equivalent mechanical parameters of anchored jointed rock mass in the slope are deduced. Uniaxial compression test and direct shear test of rock as well as direct shear test of joint are performed by numerical modeling. The errors of results are analyzed and amended. The equivalent mechanical parameters of anchored jointed rock mass are determined that the deformation modulus, friction angle and cohesion of rock as well as friction angle of joint are the same as before while the cohesion of joint is enhanced from 50kPa to 122kPa. The final conclusions accord with the results of actual physics test. The feasibility and reliability that using numerical modeling to carry out these rock mechanics tests are verified.

关 键 词：节理岩体 等效力学参数 三维离散元 3DEC 数值模拟 

分 类 号：TU455[建筑科学—岩土工程]