基于重度增加法的岩坡破坏过程流形元分析

Manifold Analysis of the Rock Slope Failure Process Based on the Gravity Increase Method

考虑岩体边坡滑动大变形破坏特性和现有研究分析手段,提出利用第一作者团队开发研制的Geo SM A-3D,在现场岩体结构信息采集的基础上,建立岩体边坡空间数值模型,实体表征岩体三维模型;利用现代数值流形法(NMM)模拟岩体大变形破坏分析手段,在块体理论的基础上,运用有限元分析中经常用到的重度增加法,不断增加岩体的重度,直到岩体边坡中的"关键块体"产生滑动,使边坡发生大变形破坏;同时以最危险"关键块体"水平位移随重度增加发生突变为破坏依据,对边坡的安全系数进行评定.实例分析某边坡工程的破坏过程,实现了岩体边坡大变形数字表征,为边坡支护提出解决方案,为工程施工和边坡灾害的处置提供参考和借鉴.

The characteristic of large deformation damage and the existing analysis method in rock slope engineering was considered; meanwhile, based on the structural information collection of the rock slope, a numerical space model of rock slope was established through GeoSMA-3D which was developed by the first author＇ s team. The numerical model can represent 3D model of rock slope, using the numerical manifold method （NMM） to simulate the process of large deformation in rock slope, based on the block theory and the gravity-increase method which is often used in the finite element method, through increasing the gravity of rock mass continuously, until the ＂key blocks＂ begin to slide, and the slope generates large deformation failure. At the same time, the safety factor of slope can be confirmed if the displacement of the most dangerous ＂key block＂ increases sharply with the increase of gravity. At last, an example of slope engineering in Liaoning is presented to achieve the characterization of large deformation damage in rock slope, proposing solutions for the slope support, providing a reference for engineering construction and prevention of slope disaster.