本文選題：黃土滑坡 + 運動過程��； 參考：《長安大學》2015年碩士論文

【摘要】：滑坡作為黃土地區(qū)典型地質災害廣泛分布,對人類活動造成嚴重威脅,尤其是高速遠程黃土滑坡,滑坡在運動的過程中推擠階地地層,往往形成獨特的內部結構。以往的研究注重黃土滑體的變形破裂,本文則分析黃土滑坡運動過程中對河流階地地層的鏟刮作用,利用物理模型試驗和數(shù)值模擬方法來分析這一過程。首先以涇陽縣內涇河南岸為研究區(qū),通過野外工作和室內資料整理,對涇河南岸黃土滑坡進行了大量現(xiàn)場調查、勘探、觀測和試驗工作,對塬邊黃土滑坡產生的條件、因素、動態(tài)規(guī)律有了一定的認識�？偨Y研究區(qū)地質背景和典型黃土滑坡的形態(tài),分析研究區(qū)黃土滑坡發(fā)育規(guī)律,為進一步的物理模型試驗和數(shù)值模擬建立概念模型。建立階地模型,通過物理模型實驗,分析不同工況下,階地地層的變形和破壞過程,劃分變形破壞階段,并分析各因素的影響規(guī)律。通過圓形離散單元來模擬顆粒介質的運動及其相互作用,由平動和轉動運動方程來確定每一時刻顆粒的位置和速度。通過顆粒流數(shù)值模擬方法,模擬黃土塬邊滑坡運動過程中對階地的推擠作用,揭示階地地層的變形破壞過程。使用顆粒流軟件建立大尺寸黃土塬邊階地模型,標定顆粒細觀參數(shù),使模型與研究區(qū)階地物質擁有相同的變形和破壞特征。通過設置模型參數(shù),研究剪切面埋深和液化程度對階地物質變形破壞的影響。通過以上分析,得出黃土滑坡運動過程中推擠階地并形成階地型內部結構的運動過程,分析影響這一過程的主要影響因素的影響規(guī)律,并定量分析形成這一獨特內部結構的形成條件。
[Abstract]:Landslide is widely distributed as a typical geological hazard in loess area, which poses a serious threat to human activities, especially the high-speed and remote loess landslide, which pushes the terraces in the process of movement, and often forms a unique internal structure. Previous studies have focused on the deformation and fracture of loess sliding body. In this paper, the shoveling effect of loess landslide on river terrace is analyzed, and the physical model test and numerical simulation method are used to analyze this process. Firstly, taking the south bank of Jingyang County as the research area, through field work and indoor data collation, a large number of on-site investigation, exploration, observation and test work were carried out on the loess landslide in the south bank of Jing River, and the conditions and factors of the loess landslide on the edge of the plateau were analyzed. Dynamic laws have a certain understanding. The geological background of the study area and the shape of typical loess landslide are summarized. The development law of loess landslide in the study area is analyzed and the conceptual model is established for further physical model test and numerical simulation. The terrace model is established and the deformation and failure process of terrace under different working conditions are analyzed through physical model experiments. The deformation-failure stages are divided and the influence laws of various factors are analyzed. The motion and interaction of granular media are simulated by circular discrete element, and the position and velocity of particles at each moment are determined by the equations of translational and rotational motion. Through the numerical simulation method of particle flow, the pushing and squeezing effect on the terrace during the landslide movement at the edge of the loess tableland is simulated, and the deformation and failure process of the terrace is revealed. The grain-flow software is used to set up the large-scale loess terrace model and to calibrate the particle meso-parameters, which makes the model have the same deformation and failure characteristics as the terrace material in the study area. The effects of shear surface depth and liquefaction degree on deformation and failure of terrace were studied by setting model parameters. Through the above analysis, the movement process of pushing and squeezing the terrace and forming the terrace internal structure in the process of loess landslide movement is obtained, and the influence law of the main influencing factors on this process is analyzed. And quantitative analysis of the formation of this unique internal structure of the formation conditions.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P642.22

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