边坡反错变形成因探究及模拟分析

发布时间：2018-07-02 14:52

本文选题：矿山边坡 + 反错变形　；参考：《长安大学》2015年硕士论文

【摘要】：露天矿开采是我国金属矿山开采的主要形式之一,在露天矿的开采过程中会形成多级台阶状的边坡。这些已经成型的台阶状边坡在应力重分布、卸荷回弹和地下水的作用下易发生多种类型的变形破坏。常见的边坡破坏类型有平面破坏、楔体破坏、弧形破坏和倾倒破坏,而本文所讨论的反错变形是一种新的边坡破坏类型,它是根据金堆城钼矿矿区北帮边坡的实际变形情况提出来的。2014年中旬,金堆城矿区1号与4号公路之间的北帮通行、观光道路1250平台出现多条临空面侧高于边坡内侧的台阶状错动,给矿区安全生产带来严重威胁。文本的研究分两部分:第一部分为了探究边坡反错变形的形成原因,提出“转动滑坡”、“结构面控制”、“空洞的影响”及“差异沉降”这四种构想,然后利用有限元软件geo-studio对这四种构想进行验证性模拟;第二部分根据金堆城北帮边坡的工程地质条件,运用geo-studio软件选取两个剖面进行模拟分析,并讨论案例边坡发生反错变形的主要原因。基于以上讨论得出本文主要结论:(1)边坡反错变形是通过对案例边坡—金堆城露天钼矿北帮边坡的研究而提出来的,露天矿边坡开挖后形成的多级台阶平台为反错变形提供了几何条件。(2)金堆城北帮边坡出现反错变形地段的物质组成为断裂带内的张性角砾岩,其特有的物理力学特征为其变形趋势创造了物质条件。(3)根据模拟成果得出泊松比ν,内摩擦角υ,粘聚力C均对边坡平台的变形趋势有影响,但其影响程度不足以使边坡发生反错变形。(4)基于四种反错变形成因构想,分别使用软件对其进行仿真模拟,研究表明在某些参数组合下四种构想在均能使模型边坡在中间平台处发生明显的反错变形。(5)研究区边坡处于燕门凹断裂带上,已经查明有两条较大断层通过,并且发育多条小规模的次级断层,断层面倾角较大。研究区边坡发生反错变形主要受岩性差异及其内部高倾角结构面的影响。
[Abstract]:Open-pit mining is one of the main forms of metal mining in China. Many types of deformation and failure are likely to occur under the stress redistribution, unloading rebound and groundwater action of these formed stepped slopes. The common types of slope failure include plane failure, wedge failure, arc failure and toppling failure. The reverse fault deformation discussed in this paper is a new type of slope failure. It was proposed on the basis of the actual deformation of the northern slope in Jinduicheng molybdenum mine area. In mid-2014, the north side of Jinduicheng mining area between Highway 1 and Road 4 passed through. On the 1250 platform of the sightseeing road, there are many stair staggered surfaces above the inner side of the slope, which pose a serious threat to the safety of production in the mining area. The research of the text is divided into two parts: the first part, in order to probe into the forming reason of the reverse fault deformation of the slope, put forward the four ideas of "rotational landslide", "structural plane control", "the influence of cavity" and "differential settlement". Then using finite element software geo-studio to verify the four ideas. The second part according to the engineering geological conditions of the north slope of Jinduicheng, using geo-studio software to select two sections for simulation analysis. The main causes of the reverse fault deformation of the slope are discussed. Based on the above discussion, the main conclusions of this paper are as follows: (1) the anti-fault deformation of the slope is put forward through the study of the north slope of Jinduicheng opencast molybdenum mine. The multi-step platform formed after the excavation of open-pit slope provides geometric conditions for anti-fault deformation. (2) the material composition of the slope in the north slope of Jinduicheng is tensional breccia in the fault zone. Its unique physical and mechanical characteristics create material conditions for the deformation trend. (3) according to the simulation results, Poisson's ratio, internal friction angle, cohesion C have influence on the deformation trend of slope platform. But its influence degree is not enough to make the slope reverse fault deformation. (4) based on four kinds of anti-fault deformation cause conception, the software is used to simulate the slope. The results show that the four ideas under some parameter combinations can cause obvious anti-fault deformation of the model slope in the middle platform. (5) the slope in the study area is located on the Yanmen concave fault zone, and two large faults have been found to pass through. And many minor secondary faults are developed, and the dip of fault plane is larger. The reverse fault deformation of the slope in the study area is mainly affected by the difference of lithology and the internal high dip structural plane.
【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】：TD854.6

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