岔角滩井田二采区采动对边坡稳定性影响及防治对策研究

发布时间：2018-12-19 08:20

【摘要】：在山区地表条件下开采容易引起地表坡体移动变形及应力重分布,诱发滑坡、崩塌、地表不均匀沉降等一系列不良地质灾害,破坏了生态环境,影响甚至威胁着矿区居民正常的生产生活。采动地表滑坡具有复杂性和多学科交叉的特点,涉及具体采矿条件及地质地形条件综合分析、坡体稳定性主要影响因素、覆岩移动变形及应力应变关系、坡体稳定性预测、防灾减灾措施科学合理等一系列问题。本文在分析井田地形地貌、地质构造、矿井生产技术条件基础上,应用理论分析与计算机数值模拟计算,确定了边坡安全系数,并提出了科学安全、经济合理的防灾减灾措施。主要研究结果如下:在分析地质采矿条件的基础上,构建了山区地表下的FLAC~(3D)数值模型,模拟计算分析了C25和C19煤层开采结束后,地表移动变形破坏情况,结果表明地表最大下沉值为2.15m,最大水平移动值为0.9m,覆岩裂缝带发育高度约为120m,开采影响范围内的居民住宅损害均达到IV级破坏程度;应用极限平衡理论分析了1号、2号坡体开采前后边坡稳定性,开采后坡体由稳定状态演变为非稳定状态,结合数值模拟分析结果,对比开采前后坡体稳定性参数变化,给出了采动影响下理论计算参数的确定方法,构建了适用于采动影响下的边坡稳定理论计算模型;应用构建的边坡稳定性计算模型和FLAC~(3D)数值模拟并结合经济分析,对比二采区全部开采和1号边坡集中居住区留设安全保护煤柱开采两种开采方法,确定了局部留煤柱保护开采方法,同时结合地面防护提出地表灾害防治对策。
[Abstract]:Mining in the mountain area will easily cause the movement deformation and stress redistribution of the surface slope, induce a series of bad geological disasters, such as landslide, collapse, uneven subsidence of the surface, and destroy the ecological environment. Affect even threaten the normal production and life of mining residents. The mining surface landslide has the characteristics of complexity and multi-disciplinary intersection, which involves the comprehensive analysis of specific mining conditions and geological and topographic conditions, the main influencing factors of slope stability, the relation of overlying rock movement and deformation and stress and strain, and the prediction of slope stability. Measures for disaster prevention and mitigation are scientific and reasonable. Based on the analysis of mine topography, geological structure and technical conditions of mine production, the safety factor of slope is determined by applying theoretical analysis and computer numerical simulation, and scientific, safe, economical and reasonable disaster prevention and mitigation measures are put forward in this paper. The main results are as follows: based on the analysis of the geological and mining conditions, the FLAC~ (3D) numerical model under the mountain surface is constructed, and the surface movement deformation and failure after the coal mining of C25 and C19 are simulated and analyzed. The results show that the maximum subsidence value is 2.15m, the maximum horizontal movement value is 0.9m, the development height of the overburden fracture zone is about 120m, and the damage to residential buildings in the area affected by mining reaches the level of IV damage. The slope stability of slope No. 1 and No. 2 before and after mining is analyzed by using the limit equilibrium theory, and the slope body evolves from stable state to non-stable state after mining. Combined with the results of numerical simulation, the stability parameters of slope body are compared before and after mining. The method of determining the theoretical calculation parameters under the influence of mining is given, and the theoretical calculation model of slope stability under the influence of mining is constructed. Based on the established slope stability calculation model and FLAC~ (3D) numerical simulation combined with economic analysis, this paper compares two mining methods: all mining in the second mining area and coal pillar mining with safety protection in the centralized residential area of slope No. 1. The mining method of partial retaining coal pillar protection is determined, and the countermeasures of surface disaster prevention are put forward in combination with surface protection.
【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】：TD325

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