某近水平层状岩质滑坡的形成机理和演化机制

发布时间：2018-03-22 16:52

本文选题：近水平层状岩质滑坡　切入点：形成条件　出处：《兰州大学》2015年硕士论文　论文类型：学位论文

【摘要】：在岩质滑坡中,有一种极为特殊的滑坡类型—近水平层状岩质滑坡。由于该类斜坡岩层缓倾,按照传统力学平衡观点,难以发生大规模的滑坡。某水电站坝后发育了一特大型近水平层状岩质滑坡,可见其具有十分特殊的形成条件和成因机理。不少学者对近水平层状岩质滑坡的成因机理进行了一定程度的研究,但大多学者研究对象为缓倾角岩层滑坡。尽管这两类滑坡在岩层倾角上相差无几,但近水平层状岩质滑坡的地质环境特征、形成条件、成因机理与缓倾角岩层滑坡相比有所不同,因此有必要深入开展对近水平层状岩质滑坡的成因机理研究。本文以某水电站坝后的近水平层状岩质滑坡为研究对象,以滑坡所处的地质环境条件为研究背景,对研究区内发育的近水平层状岩质滑坡做了系统研究。在此基础上,从工程地质的基础入手,采用现场调研、地质分析与判断、数值模拟相结合的综合分析方法,对近水平层状岩质滑坡存在的两大方面问题进行研究,主要包括：近水平层状岩质滑坡的形成条件和近水平层状岩质滑坡的演化机制。(1)从滑坡区工程地质环境入手,分析了该滑坡的形成条件和滑坡影响因素,阐述了滑坡的微地貌、滑体物质、滑体和滑带结构等特征。(2)基于该滑坡显著的分区和分层性特征,结合地质环境及其演化规律,采用力学理论、物理模型试验和数值模拟等方法,论证了该滑坡的形成机理。(3)在研究滑坡形成机理的基础上,再现其动态演化过程,分析了滑坡动态演化过程中,探讨了该滑坡的演化机制。本文对近水平层状岩质滑坡的形成机理和演化机制进行研究,据此可正确认识滑坡的特征、评价当前稳定状态、预测未来发展演化趋势以及制订相应的工程整治措施。研究结果可为复杂条件下大型近水平层状岩质滑坡的研究和工程实践提供借鉴和参考。
[Abstract]:In the rock landslide, there is a very special type of landslide, near horizontal layered rock landslide. Because the rock layer of this kind of slope is gently tilting, according to the traditional view of mechanical balance, Large scale landslides are difficult to occur. A large, near horizontal bedded rock landslide has developed behind the dam of a hydropower station. It can be seen that it has very special forming conditions and genetic mechanism. Many scholars have studied the genetic mechanism of near-horizontal bedded rock landslide to a certain extent. Although the two types of landslides are similar in dip angle, the geological environment and forming conditions of near-horizontal bedded rock landslides are similar. The genetic mechanism is different from that of slowly inclined rock landslide, so it is necessary to study the genesis mechanism of near-horizontal bedded rock landslide. In this paper, the near-horizontal bedded rock landslide behind a hydropower station dam is taken as the research object. Taking the geological environment condition of landslide as the research background, this paper makes a systematic study on the near-horizontal bedded rock landslide developed in the study area. On this basis, starting from the foundation of engineering geology, field investigation, geological analysis and judgement are adopted. Two major problems of near-horizontal bedded rock landslide are studied by the comprehensive analysis method combined with numerical simulation. The main contents are as follows: the forming conditions of near-horizontal bedded rock landslides and the evolution mechanism of near-horizontal bedded rock landslides.) starting with the engineering geological environment of the landslide area, the forming conditions and influencing factors of the landslide are analyzed, and the microgeomorphology of the landslide is expounded. Based on the obvious zoning and stratification characteristics of the landslide, combined with the geological environment and its evolution law, this paper adopts the methods of mechanics theory, physical model test and numerical simulation, etc. The formation mechanism of the landslide is demonstrated. On the basis of studying the forming mechanism of the landslide, the dynamic evolution process of the landslide is reappeared, and the dynamic evolution process of the landslide is analyzed. In this paper, the formation mechanism and evolution mechanism of the near-horizontal layered rock landslide are studied, according to which the characteristics of the landslide can be correctly recognized and the current stable state can be evaluated. The research results can be used for reference and reference for the study and engineering practice of large near-horizontal bedded rock landslides under complex conditions.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

【引证文献】