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

【摘要】：二十世紀(jì)六十年代以來,大型高速遠(yuǎn)程滑坡運(yùn)動(dòng)機(jī)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(shí)例調(diào)查與理論分析相結(jié)合的研究方法,對(duì)K24滑坡的啟程劇動(dòng)機(jī)理進(jìn)行研究,主要研究?jī)?nèi)容和成果如下：1.通過實(shí)地考察和測(cè)量,查明了映秀—臥龍公路K24滑坡的地質(zhì)條件,包括地形地貌、地質(zhì)構(gòu)造、地層巖性、水文條件等。2.分析了K24滑坡的運(yùn)動(dòng)過程,并且將整個(gè)運(yùn)動(dòng)過程分為四個(gè)運(yùn)動(dòng)階段：初始的震裂、松動(dòng)階段；啟程劇動(dòng)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(rèn)為K24滑坡啟程劇動(dòng)是由鎖固段的突然破壞釋放大量的彈性應(yīng)變能導(dǎo)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(yīng)：(1)在強(qiáng)烈震動(dòng)條件下,滑坡巖體和滑床巖體之間的摩擦系數(shù)會(huì)大幅降低,相應(yīng)的抗滑力會(huì)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(qiáng)烈震動(dòng)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(yīng)變能以“彈性回跳”的方式作用于滑體巖體上,且此時(shí)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(dòng)。4.系統(tǒng)分析了K24滑坡啟程劇動(dòng)機(jī)理,利用坡體波動(dòng)振蕩加速效應(yīng)、臨床彈性沖動(dòng)加速效應(yīng)和峰殘強(qiáng)降加速效應(yīng)來解釋滑坡的高速啟程劇動(dòng)的加速效應(yīng),并且提出了鎖固段破壞釋放能量的計(jì)算方法。5.根據(jù)實(shí)地測(cè)量數(shù)據(jù),計(jì)算K24滑坡的啟程速度及在理想狀態(tài)下啟程劇動(dòng)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(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P642.22

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本文編號(hào)：1979241