Han Zheng, Su Bin, Li Yange, Ma Yangfan, Wang Weidong, Chen Guangqi
School of Civil Engineering, Central South University, Changsha, Hunan, 410075, China.
State Key Laboratory of Geohazard Prevention and Geo-environment Protection, Chengdu University of Technology, Chengdu, Sichuan, 610059, China.
Sci Rep. 2019 Aug 27;9(1):12407. doi: 10.1038/s41598-019-48934-3.
We report on a comprehensive method for analyzing landslide stability and the mitigation effect of countermeasures in this paper. The proposed method is a combination of theoretical method and numerical method. To address the uncertainties of the soil strength parameters, the rational values of these parameters are comprehensively determined by the back-analysis result of the reliability method and the result by the quantitative method, as well as the in-situ geological test. To evaluate the slope stability, the limit analysis using the 2D upper bound method and the FEM simulation using strength reduction method are performed, respectively. In order to illustrate the presented method, the so-called Lanmuxi landslide in China is selected as a case study. Results demonstrated that the stress and strain majorly concentrated at the toe and crown of the slope. According to the analysis results, countermeasures consisting of anchor lattice beams, landslide piles, and cracks filling, are suggested to reduce the failure risk of the landslide. Effect assessment based on the FEM analysis verifies the feasibility and effectiveness of the recommended countermeasures.
本文报道了一种分析滑坡稳定性及对策减灾效果的综合方法。所提出的方法是理论方法与数值方法的结合。为解决土强度参数的不确定性问题，通过可靠性方法的反分析结果、定量方法的结果以及现场地质试验综合确定这些参数的合理值。为评估边坡稳定性，分别采用二维上限法进行极限分析和采用强度折减法进行有限元模拟。为说明所提出的方法，选取中国所谓的兰木溪滑坡作为案例研究。结果表明，应力和应变主要集中在边坡的坡脚和坡顶。根据分析结果，建议采取由锚索格构梁、抗滑桩和裂缝填充组成的对策，以降低滑坡的破坏风险。基于有限元分析的效果评估验证了所推荐对策的可行性和有效性。
