长期渗水诱发崔木煤矿工业广场滑坡形成机理及排水措施研究

发布时间：2018-04-30 21:25

本文选题：长期渗水滑坡 + 滑坡稳定性　；参考：《西安科技大学》2017年硕士论文

【摘要】：滑坡已成为地质灾害中最为严重、影响范围最大、人员伤亡最多的灾害。我国地形地质复杂,是世界上滑坡灾害比较严重的国家之一。以陕西省宝鸡市麟游县崔木煤矿工业广场滑坡为研究对象,通过对其地质条件、滑坡基本特征及变形机制、长期渗水作用机理等较为全面的系统探索,取得的主要成果包括:(1)崔木煤矿工业广场滑坡属深层、复合型、特大型滑坡。该滑坡可分为古滑坡、次级滑坡和新滑坡。古滑坡受特殊的地层条件形成;新滑坡为地表水长期下渗引起地下水位上升,从而诱发的古滑坡局部复活;次级滑坡主要受新滑坡的牵引作用形成。(2)建立水文地质模型,利用GEO Studio软件中的seep/w模块,进行了非饱和瞬态渗流数值模拟长期渗水诱发滑坡形成过程,得出不同时期坡体孔隙水压力云图。(3)基于非饱和抗剪强度的极限平衡法,考虑地下水位线变化与滑坡土体内基质吸力分布状态的关系,采用Morgenstern-Price法对滑坡地质模型进行了稳定性分析。稳定分析结果表明该类滑坡存在“稳定性突降期”,在此期间,坡体稳定性较之整个滑坡形成期降幅最快。(4)针对该类滑坡滑动面埋深较大,提出两套地下排水措施,即“井点抽水”和“排水盲洞”,利用数值模拟的方法,验证排水措施的有效性。研究结果表明,“井点抽水”和“排水盲洞”方案均能快速降低坡体内地下水位,能大幅降低孔隙水压力,以渗流模拟结果计算滑坡体稳定性,验证了两套地下排水措施的实效性。
[Abstract]:Landslide has become the most serious geological disaster, the largest impact range, the most casualties of disasters. China is one of the countries with serious landslide disasters because of its complicated topography and geology. Taking the Cuimu Coal Mine Industrial Square landslide in Linyou County, Baoji City, Shaanxi Province as the research object, this paper makes a comprehensive and systematic exploration on the geological conditions, the basic characteristics and deformation mechanism of the landslide, the mechanism of long-term seepage, and so on. The main results obtained include: 1) Cuimu Coal Mine Industrial Square landslide is deep, complex and super large landslide. The landslide can be divided into ancient landslides, secondary landslides and new landslides. The ancient landslide is formed by special formation conditions; the new landslide is caused by the underground water level rising due to the long-term infiltration of surface water, thus inducing the local revival of the ancient landslide; the secondary landslide is mainly towed by the new landslide to form a hydrogeological model. Using the seep/w module of GEO Studio software, the numerical simulation of the formation process of landslide induced by long term seepage with unsaturated transient seepage is carried out, and the pore water pressure cloud map of slope body in different periods is obtained, which is based on the limit equilibrium method of unsaturated shear strength. Considering the relationship between the variation of underground water level and the distribution of matrix suction in landslide soil, the stability of landslide geological model is analyzed by Morgenstern-Price method. The results of stability analysis show that there is a "period of sudden fall of stability" in this kind of landslide. During this period, the stability of slope body is decreased more rapidly than that of the whole landslide. (4) two sets of underground drainage measures are put forward in view of the large buried depth of sliding surface of this kind of landslide. Namely "well point pumping" and "drainage blind hole", using numerical simulation method to verify the effectiveness of drainage measures. The results show that both the "well point pumping" and "drainage blind hole" schemes can rapidly reduce the groundwater level in the slope and greatly reduce the pore water pressure. The stability of the landslide body is calculated by the seepage simulation results. The effectiveness of two sets of underground drainage measures is verified.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD74;P642.22

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