摘要
双层反翘复合型滑坡在自然界普遍发育,以具有典型双层反翘型滑坡特征的韩家垭滑坡为工程背景,运用现场勘察、物理模拟、现场监测、数值模拟等多方法、多手段综合研究该类型滑坡的成灾机制。通过竖井、探槽、钻探、物探、地表调绘等多种工程地质勘察手段,直观揭示上、下两层滑动面的分布位置和基本特征,以及前缘岩层反翘特征;通过现场监测,进一步确定了两层滑动面的位置及滑坡运动的阶段性和周期性;运用大块体地质力学模型试验,采用数码像机数字化近景摄影测量技术量测位移场,在实验室进行物理仿真,短期内重现该类型滑坡在漫长地史时期发育、发展、演化和形成全过程以及反翘岩层的弯曲折断渐进破坏全过程;采用弹塑性有限元法分析该类滑坡的变形破坏力学机制和反翘成因。数值仿真结果与现场实际情况、现场监测结果和物理模拟试验结果吻合较好,为防治该类滑坡提供基础性研究依据。
The landslide with double sliding plane and rock-layer reverse exists in the nature universally. Taking Hanjiaya Landslide along Xiangfan--Shiyan Expressway for example, which has the representative characteristics of the landslide with double sliding plane and rock-layer reverse, many research methods such as in-situ investigation, physical simulation, in-situ monitoring, numerical simulation, etc., are comprehensively adopted to analyze the basic characteristics, formation and development conditions, deformation and failure mechanisms of this kind of landslide. In order to expose the basic characteristics, form and development conditions of the landslide with double sliding plane and rock-layer reverse, various engineering geological methods are adopted, such as geological drilling, costeaning, trenching, geophysical survey, surface investigation, etc.. The positions and the basic characteristics of two slip surfaces and the front rock-layer reverse characters are ascertained by in-situ monitoring. Large-scale geomechanical model test and the technology of digital close-range photogrammetry are adopted to measure displacement field. The physical emulation is used to study the development, evolvement and formation processes in long geological history in laboratory and the gradual failure process of curvature and rupture on reverse rock-layer. Finite element method is adopted to calculate and analyze the deformation and failure mechanisms and the rock-layer reverse cause. The numerical simulation results and the practical ones, the in-situ monitoring and the physical simulation results coincide with each other. The research provides a scientific basis for mechanism study and treatment of the similar landslides.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2009年第3期552-559,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(40772186)
关键词
边坡工程
滑坡
双(多)层滑动面
反翘
成灾机制
slope engineering
landslide
double or multilayer sliding planes
rock-layer reverse
deformation and failure mechanisms
