黄土滑坡运动特征及其铲刮作用研究

发布时间：2018-06-22 00:49

本文选题：黄土滑坡 + 运动过程　；参考：《长安大学》2015年硕士论文

【摘要】：滑坡作为黄土地区典型地质灾害广泛分布,对人类活动造成严重威胁,尤其是高速远程黄土滑坡,滑坡在运动的过程中推挤阶地地层,往往形成独特的内部结构。以往的研究注重黄土滑体的变形破裂,本文则分析黄土滑坡运动过程中对河流阶地地层的铲刮作用,利用物理模型试验和数值模拟方法来分析这一过程。首先以泾阳县内泾河南岸为研究区,通过野外工作和室内资料整理,对泾河南岸黄土滑坡进行了大量现场调查、勘探、观测和试验工作,对塬边黄土滑坡产生的条件、因素、动态规律有了一定的认识。总结研究区地质背景和典型黄土滑坡的形态,分析研究区黄土滑坡发育规律,为进一步的物理模型试验和数值模拟建立概念模型。建立阶地模型,通过物理模型实验,分析不同工况下,阶地地层的变形和破坏过程,划分变形破坏阶段,并分析各因素的影响规律。通过圆形离散单元来模拟颗粒介质的运动及其相互作用,由平动和转动运动方程来确定每一时刻颗粒的位置和速度。通过颗粒流数值模拟方法,模拟黄土塬边滑坡运动过程中对阶地的推挤作用,揭示阶地地层的变形破坏过程。使用颗粒流软件建立大尺寸黄土塬边阶地模型,标定颗粒细观参数,使模型与研究区阶地物质拥有相同的变形和破坏特征。通过设置模型参数,研究剪切面埋深和液化程度对阶地物质变形破坏的影响。通过以上分析,得出黄土滑坡运动过程中推挤阶地并形成阶地型内部结构的运动过程,分析影响这一过程的主要影响因素的影响规律,并定量分析形成这一独特内部结构的形成条件。
[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.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

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