断层控制下采动边坡变形破坏研究

发布时间：2018-05-26 22:06

本文选题：采动边坡 + 断层　；参考：《太原理工大学》2016年硕士论文

【摘要】：边坡变形破坏,极易造成滑坡、崩塌、泥石流等地质灾害的发生,进而很大程度地影响周边人民群众的生命财产安全。边坡变形破坏通常由地形地貌、地层岩性、断层构造及地下开采等多种因素共同作用的结果。本文以断层控制下的采动边坡为研究对象,借助数值模拟方法,建立有无断层情况下的数值计算模型,对比分析断层造成采动边坡变形破坏特征及机理。同时结合风峁顶不稳定斜坡工程实例,综合分析断层对采动边坡变形破坏造成的影响。由本次模型分析可得如下结果:(1)煤层开采引起边坡内应力分布发生变化,导致边坡出现变形破坏,从而降低边坡体的稳定性。断层的存在,加快了坡体的变形破坏,造成边坡的稳定性进一步降低。(2)采空区位于断层下盘时对边坡变形破坏影响较大。计算模型中,断层面倾角(30°、45°、60°及75°)越大,边坡稳定性越低。采空区边缘与断面之间水平距离(20m、40m、60m及80m)越大,断层对采空区上覆岩体变形的影响效果越弱,模型中二者距离增加至80m时,影响效果基本消失。(3)通过对所建采动边坡地质模型的数值模拟,分析可得受断层上盘影响,坡顶产生负向垂直位移,坡脚岩体受断层下盘挤压,出现朝临空面的位移。与风峁顶实际调查的山顶地表下陷,山脚公路旁两侧压性地裂缝及地面隆起变形现象基本吻合,说明本次数值模拟具有较高的可靠性。
[Abstract]:Slope deformation and destruction are easy to cause landslide, collapse, debris flow and other geological disasters, and then to a large extent affect the safety of the lives and property of the surrounding people. Slope deformation and failure are usually caused by various factors, such as topography and geomorphology, stratigraphic lithology, fault structure and underground mining. In this paper, the mining slope under fault control is taken as the research object, and the numerical calculation model of mining slope caused by fault is established by means of numerical simulation method, and the characteristics and mechanism of deformation and failure of mining slope caused by fault are compared and analyzed. At the same time, the influence of fault on the deformation and failure of mining slope is analyzed synthetically with the example of unstable slope of Fengmao roof. According to the model analysis, the following results can be obtained: 1) the stress distribution in the slope is changed due to the mining of the coal seam, which leads to the deformation and failure of the slope, thus reducing the stability of the slope body. The existence of faults accelerates the deformation and failure of slope body and further reduces the stability of slope. In the calculation model, the larger the dip angle of fault plane is, the lower the slope stability is. The larger the horizontal distance between the edge of goaf and the section is 20m ~ 40m ~ 60m and 80m), the weaker the effect of fault on the deformation of overlying rock mass in goaf is, and when the distance between them increases to 80m in the model, the influence of fault on the deformation of overlying rock mass in goaf is weaker. Through the numerical simulation of the geological model of the mining slope, it can be analyzed that the slope top produces negative vertical displacement, and the rock mass at the foot of the slope is squeezed by the fault footwall, and the displacement towards the face of the empty face can be obtained by the numerical simulation of the geological model of the mining slope. It is in good agreement with the ground subsidence on the hilltop investigated by Fengmao roof, the compressive ground fissure and the ground uplift deformation on both sides of the mountain foot highway, which indicates that the numerical simulation has high reliability.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P642.2

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