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  本文選題：K24滑坡 + 鎖固段��； 參考：《西南交通大學》2015年碩士論文

【摘要】：二十世紀六十年代以來,大型高速遠程滑坡運動機理已經(jīng)成為滑坡研究的世界性前沿課題。本文將主要研究大型高速滑坡,以映秀—臥龍公路K24滑坡為原型,采用實例調查與理論分析相結合的研究方法,對K24滑坡的啟程劇動機理進行研究,主要研究內容和成果如下：1.通過實地考察和測量,查明了映秀—臥龍公路K24滑坡的地質條件,包括地形地貌、地質構造、地層巖性、水文條件等。2.分析了K24滑坡的運動過程,并且將整個運動過程分為四個運動階段：初始的震裂、松動階段；啟程劇動的彈射階段；空中的飛行散落階段；落地后的堆積階段。3.分析認為K24滑坡啟程劇動是由鎖固段的突然破壞釋放大量的彈性應變能導致的。介紹了滑坡鎖固段形成的原因,分析提出鎖固段突然破壞后帶來的三種效應：(1)在強烈震動條件下,滑坡巖體和滑床巖體之間的摩擦系數(shù)會大幅降低,相應的抗滑力會大幅降低；(2)由于巖溶管道阻塞,大量巖溶水積聚在滑坡巖體中,在強烈震動下,孔隙水壓劇增,滑體的有效法向壓力降低,使滑體和滑床之間摩擦力降低；(3)鎖固段剪斷瞬間,大量彈性應變能以“彈性回跳”的方式作用于滑體巖體上,且此時滑床的抗滑力已大幅下降,故上部滑體瞬間被彈出,致使K24滑坡以較大加速度啟程劇動。4.系統(tǒng)分析了K24滑坡啟程劇動機理,利用坡體波動振蕩加速效應、臨床彈性沖動加速效應和峰殘強降加速效應來解釋滑坡的高速啟程劇動的加速效應,并且提出了鎖固段破壞釋放能量的計算方法。5.根據(jù)實地測量數(shù)據(jù),計算K24滑坡的啟程速度及在理想狀態(tài)下啟程劇動的加速度。
[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.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P642.22

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本文編號：1979241