摘要
发展了一套基于滑移线场理论,并根据有限单元法的计算结果来确定边坡滑裂面的数值模拟方法,在此基础上研究了流动法则对边坡稳定分析的影响。该方法可以考虑弹性区与塑性区的区别,并可以考虑不同的流动法则。给出了滑移线方向场数值模拟的具体方法和由滑移线方向场追踪滑移线的方法,提出安全系数最小的滑移线即为边坡的滑裂面。算例证明了方法的有效性。研究结果表明,对于无约束的天然边坡,自重作用下其安全系数受流动法则的影响较小,而滑裂面的位置随流动法则的不同而不同;当坡顶有荷载作用时,尤其是边坡的稳定性主要由坡顶荷载决定时,无论是安全系数还是滑裂面,流动法则的影响均很大,采用相关联流动法则可能会高估边坡的稳定性。
A method to search for the slip surface in slope through finite element result based on the theory of slip line is improved; and the influence of the flow rule on the slope stability is studied based on this method. In this method, the elastic area and plastic zone can be distinguished and the different flow rules can be considered. The methods to protract the orientation field of slip line and trace the slip line from any point in export portion are brought out. The slip line of which the safety factor is least, is the critical slip surface. The examples have shown the reliability of the method. The study indicates that the flow rule has small influence on the stability of the slope without restriction; however, the critical slip surface may be different. If there are loads on the top of the slope, especially the loads are crucial, the flow rule can influence both the safety factor and the slip surface remarkably. If the associated flow rule is adopted, the stability of the slope may be overestimated.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第15期2609-2616,共8页
Chinese Journal of Rock Mechanics and Engineering
