【摘要】：關(guān)于牽引式滑坡變形演化方面的研究,現(xiàn)有文獻很少,目前大家普遍接受的觀點是:牽引式滑坡一般是由于坡腳沖蝕或開挖等因素引起,綜合的不利因素導(dǎo)致牽引區(qū)滑體失穩(wěn),隨著變形的增大,牽引區(qū)后緣支撐減弱甚至臨空,牽引區(qū)滑體后緣斜坡體也發(fā)生變形失穩(wěn),滑坡體向后向上發(fā)展,最終滑動面逐漸貫通形成大型滑坡體;目前就牽引式滑坡裂縫分類及演化階段劃分并沒有統(tǒng)一的標準。物理模型試驗是進行邊坡研究的重要手段,可以用來模擬各種工況。本研究運用自行設(shè)計的牽引式滑坡模型試驗裝置進行了不同條件下的牽引式滑坡物理模型試驗,試驗借助了相機、三維激光掃描儀及應(yīng)力采集裝置對試驗過程進行了記錄,經(jīng)分析,主要結(jié)論如下:(1)設(shè)計的模型試驗方案實現(xiàn)了牽引式滑坡的分期破壞過程,通過試驗,得到了每組試驗具體裂縫產(chǎn)生的順序及裂縫演化過程,驗證了所設(shè)計牽引式滑坡模型試驗的可行性及合理性,同時驗證了利用該試驗方法進行牽引式滑坡支護措施優(yōu)選的可行的。(2)通過分析裂縫貫通比隨時間變化規(guī)律,本文將牽引式滑坡變形演化過程分為5個階段:初始變形階段、勻速變形階段、加速變形階段、穩(wěn)定變形階段及整體滑動階段。(3)本文對牽引式滑坡各類型滑坡裂縫在時間及空間分布規(guī)律進行了總結(jié),同時對各試驗演化階段時間占試驗時間的百分比進行了統(tǒng)計,結(jié)合裂縫貫通比-時間曲線,從滑坡模型試驗的角度出發(fā),得出了可以將裂縫貫通比達到40%作為滑坡臨滑預(yù)警值的結(jié)論。
[Abstract]:There are few literatures on the deformation evolution of traction landslide. At present, it is generally accepted that the traction landslide is generally caused by erosion or excavation at the foot of the slope, and the comprehensive unfavorable factors lead to the instability of the sliding body in the traction area. With the increase of deformation, the support of the rear edge of the traction area is weakened or even empty, the slope body of the rear edge of the traction area is also deformed and unstable, the landslide body develops backward and upward, and finally, the sliding surface gradually passes through to form a large landslide body. At present, there is no uniform standard for the classification and evolution stage classification of traction landslide fractures. Physical model test is an important method for slope research and can be used to simulate various working conditions. In this study, the physical model test of traction landslide was carried out under different conditions with the help of a camera, a 3D laser scanner and a stress acquisition device, and the test process was recorded with the help of a self-designed tractive landslide model test device, and the experiment was carried out with the aid of a camera, a three-dimensional laser scanner and a stress acquisition device. Through analysis, the main conclusions are as follows: (1) the designed model test scheme realizes the stage failure process of the traction landslide. Through the tests, the sequence of concrete cracks and the evolution process of the cracks in each group of tests are obtained. The feasibility and rationality of the designed traction landslide model test are verified, and the feasibility of optimal selection of the traction landslide supporting measures by using the test method is verified. (2) by analyzing the variation law of fracture through-through ratio with time, In this paper, the process of deformation evolution of traction landslide is divided into five stages: initial deformation stage, uniform deformation stage, accelerated deformation stage. (3) in this paper, the time and space distribution of the cracks in each type of landslide is summarized, and the percentage of the time in the test time in each stage of evolution is counted. Based on the fracture penetration ratio-time curve and from the point of view of landslide model test, it is concluded that 40% fracture penetration ratio can be regarded as the early warning value of landslide impending slide.
【學(xué)位授予單位】：華北水利水電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P642.22

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