基于大变形分析的三峡库区某滑坡防治设计研究

三峡库区某岩质滑坡的变形失稳涉及到地质、环境、人类工程活动等多种因素。针对该滑坡的变形破坏规律和诱发机制，拟采用削坡、抗滑桩、排水系统等加固措施，以确保滑坡整体和局部稳定，其中加固方案的长期有效性将是整个治理工程的关键。通过对大变形数值方法以及滑坡治理工程措施特点的分析，认为在研究滑坡治理工程大变形问题时采用非线性大变形数值方法更加合理，加固方案的优化设计采用了三维快速拉格朗日分析（FLAC3D）法，通过对滑坡区位移场以及破坏区的变化规律进行分析，将各项加固措施及其组合工况的治理效果进行对比优选，最后确定出以抗滑桩和削坡为主、排水为辅的最优加固方案。该方案的治理效果已被实践资料所证实，其中的部分方法和结论对三峡库区滑坡地质灾害的防治具有指导意义。

Study on optimum design of a landslide stabilization in Three Gorges reservoir area based on large deformation numerical method

A large rock landslide in the Three Gorges reservoir area involved several complex mechanisms relating to geological, environmental and human engineering activities processes. In response to deformation and failure specificities and trigger mechanism of the landslide, reinforcement measures involving cutting, large section anti-slipping piling, drainage system are used to insure the holistic and local stability of landslide zone. While the validity and applicability of reinforcement sequences of landslides are among the key issues in the whole treatment project. According to analysis of large deformation numerical method and characteristic of landslide treatment project, large deformation numerical methods for analyzing effect of landslide treatment project are proposed. The 3D Fast Lagrangian Analysis of Continua(FLAC) method is adopted to proceeding optimum design of reinforcement schemes, based on analyzing the change of displacement and damaged zone. Treatment effect obtained by all kinds of methods and their combination are compared with each other; and the best treatment scheme involving anti-slipping piling and cutting complementing drainage system is selected as the proposed scheme. The present investigation has provided both factual data and insights for the stability and deformation evaluation of the landslide. The approach and methodology developed are useful for the prevention and treatment of the similar landslides in the Three Gorges reservoir area.