不同地层组合下南宁盆地滑坡形成机理研究

发布时间：2018-04-26 00:21

本文选题：南宁盆地 + 第三系泥岩　；参考：《广西大学》2016年硕士论文

【摘要】：南宁盆地第三系泥岩广泛分布,且第三系泥岩具有软化性、崩解性、膨胀性等特点。由泥岩组成的滑坡遇到降雨极易滑坡,给工程建设带来极大的危害。因此研究不同地层组合下南宁盆地滑形成机理对于预测以及治理第三系泥岩滑坡灾害有重要意义。本文收集南宁市涉及第三系泥岩滑坡的勘查报告近百份,统计分析其中第三系泥岩的物理力学参数以及膨胀性参数,以此作为数值模拟的参数。同时根据勘察报告将南宁盆地涉及第三系泥岩的地层进行分析整理,简化地层组合模型,并以此为基础进行有限元数值模拟。模拟边坡在降雨后的情景,通过数值模拟找出不同坡度的边坡的临界高度,即边坡在此高度之下出于稳定状态,而高于此高度则在降雨后极易失稳。之后对不同坡度下对应的临界高度进行拟合。得出不同模型下坡度-临界坡高曲线。论文一方面总结了南宁盆地第三系泥岩的参数,可以为相关的工程建设提供参考。另一方面,论文绘制出不同模型下坡度-临界坡高曲线,可以为工程实践提供重要参考。
[Abstract]:Tertiary mudstone is widely distributed in Nanning Basin, and Tertiary mudstone is characterized by softening, disintegrating and swelling. Landslide composed of mudstone is easy to landslide when it comes to rainfall, which brings great harm to engineering construction. Therefore, it is of great significance to study the mechanism of slip formation in Nanning Basin under different stratigraphic assemblages for predicting and controlling the landslide hazard of Tertiary mudstone. In this paper, we collect nearly 100 reports on the exploration of Tertiary mudstone landslides in Nanning, and analyze the physical and mechanical parameters and swelling parameters of Tertiary mudstones, which are taken as the parameters of numerical simulation. At the same time, according to the survey report, the strata involved in Tertiary mudstone in Nanning Basin are analyzed and sorted, and the stratigraphic assemblage model is simplified, and the finite element numerical simulation is carried out on the basis of this model. In order to simulate the slope after rainfall, the critical height of slope with different slope degree is found by numerical simulation, that is, the slope is stable under this height, but the slope above this height is easy to lose stability after rainfall. Then the critical height corresponding to different slopes is fitted. The slope-critical slope height curves under different models are obtained. On the one hand, the paper summarizes the parameters of Tertiary mudstone in Nanning Basin, which can provide reference for related engineering construction. On the other hand, the paper draws the slope-critical slope height curve under different models, which can provide an important reference for engineering practice.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P642.22

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