基于弧长控制法的边坡稳定弹塑性有限元分析  

Finite Element Analysis on Slope Stability Elastic-plastic Based on the Arc length Method

作　　者：王灵宽 

机构地区：[1]山西省第六地质工程勘察院,山西运城044000

出　　处：《西部探矿工程》2012年第8期15-19,27,共6页West-China Exploration Engineering

摘　　要：在强度折减过程中讨论了基本计算方法和弧长控制法的应用,关于有限元计算过程中怎样利用弧长控制法来调整强度参数的降低量,以便精确得到土体结构的极限状态及相应的强度参数值进行了研究。以杭兰高速公路巫山到奉节段一典型边坡为例,借助PLAXIS有限元分析程序,利用基于弧长控制法的弹塑性有限元法分析了该边坡的稳定性,并与传统的Bishop法、Janbu法等方法计算所得边坡稳定系数进行了对比分析。结果表明,有限元强度折减法能更加真实地反映边坡的实际情况,求得的边坡稳定系数更接近边坡的实际稳定状态,显示出其在边坡稳定性分析中的一定优势。The paper discusses basic calculation method and appli- cation of the arc length control about the finite elements in the reducing strength process. How to adjust total decreased value of strength parameters by the arc length method in order to acquire the limit state of soil structure and the corresponding strength parameters in the finite elements calculation process is studied. Taking a typical slope on section from Wushan to Fenjie of Hang-Lan highway as an example, the stability of the slope is analyzed by elastic-plastic finite elements method （FEM） based on the arc iength using PLAX1S finite element analyzing program, and contrasting the slope stability coefficient obtainedfrom conventional Bishop method and Janbu method. The results shows that the finite elements strength subtraction method can more factually reflect actual situation of slope, its slope stability coefficient of slope stability is more close to actual stability con-dition, indicating this method has certain advantages in slope stability analysis.

关 键 词：边坡稳定性分析 强度折减法 弧长控制法 稳定系数 

分 类 号：TU45[建筑科学—岩土工程]