基于极限平衡理论和有限元强度折减法的预应力锚索加固边坡稳定性分析研究

Abstract

本文以贵阳会文变至渔安变220千伏线路铁塔边坡为依托工程，采用极限平衡法和有限元强度折减法对高边坡在预应力锚索加固前后的稳定性进行计算分析，探讨了施加预应力锚索后对边坡位移及稳定性的影响，通过模型计算结果与监测资料的对比得出结论：极限平衡理论与有限元强度折减法得到的安全系数和滑动面基本一致。监测资料与计算结果相吻合，预应力锚索加固后该边坡处于稳定状态，本文研究成果可为类似工程设计提供参考。 The paper uses the Slope of 220 kv Variable Pressure Transmission Iron Tower from Huiwen to Yu’an in Guiyang as an engineering example. It calculates and analyses the high slope stability after reinforcement by prestressed anchor cable based on the theory of limit equilibrium method and finite element strength reduction method. It discusses the influence of prestressed anchor cable on stability and displacement. The calculation results are compared with the collected monitoring data and the conclusions are drawn. The safety factors and sliding surfaces by limit equilibrium method and finite element strength reduction method are almost the same. The monitoring data are consistent with the calculation results, and the slope is stable after reinforcement by prestressed anchor cable. Thus, the result can be used as a reference for engineering design.