映秀—卧龙公路K24滑坡机理分析

发布时间：2018-06-04 23:08

本文选题：K24滑坡 + 锁固段　；参考：《西南交通大学》2015年硕士论文

【摘要】：二十世纪六十年代以来,大型高速远程滑坡运动机理已经成为滑坡研究的世界性前沿课题。本文将主要研究大型高速滑坡,以映秀—卧龙公路K24滑坡为原型,采用实例调查与理论分析相结合的研究方法,对K24滑坡的启程剧动机理进行研究,主要研究内容和成果如下：1.通过实地考察和测量,查明了映秀—卧龙公路K24滑坡的地质条件,包括地形地貌、地质构造、地层岩性、水文条件等。2.分析了K24滑坡的运动过程,并且将整个运动过程分为四个运动阶段：初始的震裂、松动阶段；启程剧动的弹射阶段；空中的飞行散落阶段；落地后的堆积阶段。3.分析认为K24滑坡启程剧动是由锁固段的突然破坏释放大量的弹性应变能导致的。介绍了滑坡锁固段形成的原因,分析提出锁固段突然破坏后带来的三种效应：(1)在强烈震动条件下,滑坡岩体和滑床岩体之间的摩擦系数会大幅降低,相应的抗滑力会大幅降低；(2)由于岩溶管道阻塞,大量岩溶水积聚在滑坡岩体中,在强烈震动下,孔隙水压剧增,滑体的有效法向压力降低,使滑体和滑床之间摩擦力降低；(3)锁固段剪断瞬间,大量弹性应变能以“弹性回跳”的方式作用于滑体岩体上,且此时滑床的抗滑力已大幅下降,故上部滑体瞬间被弹出,致使K24滑坡以较大加速度启程剧动。4.系统分析了K24滑坡启程剧动机理,利用坡体波动振荡加速效应、临床弹性冲动加速效应和峰残强降加速效应来解释滑坡的高速启程剧动的加速效应,并且提出了锁固段破坏释放能量的计算方法。5.根据实地测量数据,计算K24滑坡的启程速度及在理想状态下启程剧动的加速度。
[Abstract]:Since 1960's, the movement mechanism of large high-speed and long-range landslide has become a world-leading subject in landslide research. This paper will mainly study the large-scale high-speed landslide, taking the K24 landslide of Yingxiu-Wolong Highway as the prototype, using the method of case investigation and theoretical analysis to study the mechanism of K24 landslide. The main research contents and results are as follows: 1. The geological conditions of the K24 landslide in Yingxiu-Wolong Highway, including topography and geomorphology, geological structure, stratigraphic lithology, hydrological conditions, etc. The movement process of K24 landslide is analyzed, and the whole process is divided into four stages: initial shock crack, loosening stage, ejection stage of departure and dramatic movement, flight scatter stage in the air, and accumulation stage. 3 after landing. It is considered that the sudden movement of K24 landslide is caused by the sudden failure of the locking section and the release of a large amount of elastic strain energy. This paper introduces the causes of the formation of the locking section of the landslide, and analyses and proposes that the friction coefficient between the landslide rock mass and the sliding rock mass will be greatly reduced under the condition of strong vibration, the three kinds of effects brought about by the sudden failure of the locking section. Due to the blockage of karst pipeline, a large amount of karst water accumulates in landslide rock mass. Under strong vibration, pore water pressure increases sharply and the effective normal pressure of sliding body decreases. The friction between the sliding body and the sliding bed can be reduced at the moment of shear of the locking section. A large amount of elastic strain can act on the rock mass of the sliding body in the form of "elastic rebound", and at this time, the anti-slip force of the sliding bed has been greatly reduced, so the upper slip body is popped up instantly. Cause K24 landslide to set off with large acceleration. 4. Based on the analysis of K24 landslide departure motive theory, the acceleration effect of slope body oscillation, clinical elastic impulse acceleration effect and peak residual strength drop acceleration effect are used to explain the acceleration effect of high speed departure of landslide. A method for calculating the energy released from the failure of the locking section is proposed. Based on the field measurement data, the departure velocity of K24 landslide and the acceleration of departure under ideal condition are calculated.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

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