基于双剪统一屈服准则在岩质边坡稳定分析中的应用  

Application of Double Shear Unified Yield Criterion to Stability Analysis of Rock Slope

作　　者：顾家瑜 杨保存[2,3] 

机构地区：[1]塔里木大学水利与建筑工程学院,新疆 阿拉尔 [2]塔里木大学水利与建筑工程学院,新疆 阿拉尔 [3]塔里木大学南疆岩土工程研究中心,新疆 阿拉尔

出　　处：《土木工程》2021年第10期1034-1042,共9页Hans Journal of Civil Engineering

摘　　要：岩质边坡分析中常用的Drucker-Prager屈服准则,并未考虑中间主应力效应,无法反映岩石材料的真实受力状态。而双剪统一强度理论包含了一系线性破坏准则,通过改变中间主应力系数b来反映中间主应力的影响程度。利用ANSYS有限元软件基于双剪统一屈服准则与统一弹塑性有限元程序UEPP,分别计算b为0、0.5、1共三种情况下岩质边坡稳定性情况。结果表明:随着中间主应力系数b的减小,等效塑性应变分布区域增大,安全系数减小,剪应力增大,岩体的承载能力没有得到更大的发挥,不利于对实际工程优化设计。另外为了更加清晰地了解中间主应力对边坡稳定分析的影响,与Drucker-Prager屈服准则模拟结果相比较,结果表明:中间主应力在边坡稳定分析中不可忽视,并且基于双剪统一屈服准则下的岩质边坡更难贯通,能够充分发挥材料的强度潜能。The Drucker-Prager yield criterion commonly used in rock slope analysis does not consider the intermediate principal stress effect and cannot reflect the real stress state of rock material. The double-shear unified strength theory contains a linear failure criterion which reflects the influence degree of intermediate principal stress by changing the intermediate principal stress coefficient. Using ANSYS finite element software based on double shear unified yield criterion and unified elastic-plastic finite element program UEPP, the rock slope stability was calculated as 0, 0.5 and 1 respectively. The results show that with the decrease of intermediate principal stress coefficient, the distribution area of equivalent plastic strain increases, the shear stress increases, and the bearing capacity of rock mass does not get greater play, which is not conducive to the practical engineering optimization design. In addition, in order to understand the influence of intermediate principal stress on slope stability analysis more clearly, the simulation results are compared with Drucker-Prager yield criterion. The results show that the intermediate principal stress cannot be ignored in slope stability analysis, and the rock slope based on the unified yield criterion of double shear is more difficult to penetrate, which can make full use of the strength potential of materials.

关 键 词：双剪统一屈服准则 岩质边坡 UEPP Drucker-Prager屈服准则 ANSYS 

分 类 号：TU4[建筑科学—土工工程]