有限元强度折减法边坡失稳判据的适用性研究  

Applicability of Slope Failure Criteria by FEM Shear Strength Reduction

作　　者：李永亮 周国胜 李永鹏 LI Yongliang;ZHOU Guosheng;LI Yongpeng(Geotechnical Institute,JSTI Group（Gansu）Transportation Planning and Design Co.,Ltd.,Lanzhou,Gansu 730030,China)

机构地区：[1]苏交科集团(甘肃)交通规划设计有限公司岩土院,甘肃兰州730030

出　　处：《水利与建筑工程学报》2018年第5期125-129,共5页Journal of Water Resources and Architectural Engineering

摘　　要：采用有限元强度折减法进行边坡稳定性分析时,存在多种失稳判别标准。从工程实践角度而言,不同失稳判据的适用性会因边坡岩土类别的差异而有所变化,但目前对这方面的研究相对缺乏。依托于某公路工程,根据岩土类型对深挖路堑边坡进行简单分类,借助PLAXIS建模探究典型的三种失稳判据对不同类型边坡稳定性分析的适用性。研究结果表明,均质土坡应采用判据Ⅱ为主、判据Ⅲ为辅;非均质土坡和土-岩边坡应将判据Ⅲ作为主要失稳标准,辅以判据Ⅱ;岩质边坡则应首选判据Ⅰ为失稳标准,辅以判据Ⅱ。There are various failure criteria for analyzing slope stability by FEM shear strength reduction. From an engineering practice perspective,the applicability of different failure criteria will vary depending on the types of slope soil. However,the current research on this aspect is limited. According to the geotechnical category,a simple classification of deep excavation slope is carried out on the basis of a highway project. The applicability of three typical failure criteria for stability analysis of different types of slopes is then explored by using Plaxis modeling.The results show that： the homogeneous soil slope should be mainly based on criterionⅡ,and criterion Ⅲ as a complementary standard; criterion Ⅲ should be regarded as the main basis and criterion Ⅱ as a complementary standard for the non-homogeneous soil slope and soil-rock slope. Similarly,it＇s should be adopted that criterionⅠas the main basis and criterion Ⅲ be supplemented for rock slope.

关 键 词：公路工程 边坡 有限元强度折减法 失稳判据 PLAXIS 

分 类 号：TU457[建筑科学—岩土工程]