【作者】 刘智；

【导师】 余学义；

【作者基本信息】 西安科技大学 ， 采矿工程， 2008， 硕士

【摘要】 陕西彬长矿区开采煤层属于下侏罗统延安组含煤地层,地表覆盖有60～140m厚的黄土层,地表地形属于黄土残塬沟壑地貌,煤层上覆基岩综合岩性为中等坚硬岩层,特别是下白垩统洛河组(K1l)、下白垩统宜君组(K1y)、安定组6号层泥质砂岩岩层整体厚度大,岩层强度高、岩性坚硬,在一定开采范围条件下起着控制上覆岩体破坏的作用。因此,厚松散层厚坚硬岩层开采条件下地表的移动变形规律及上覆岩体的结构稳定性的研究对彬长矿区的安全生产具有重要的意义。本文以彬长矿区大佛寺40301首采工作面煤层开采地面建筑物保护可行性研究为依托,以现场调查和观测资料为基础,结合厚黄土层物理力学特性,分析了采动影响下厚松散层厚坚硬岩层内部的沉陷损害特征、地表裂缝的形成条件、影响地表裂缝破坏程度的主要因素。应用覆岩托板理论计算分析了厚松散层厚坚硬岩层条件下托板的破坏形态及强度、刚度破坏准则。依据煤层覆岩中坚硬岩层托板的结构稳定性条件及黄土变形破坏特性、硬岩对岩移参数的影响,结合相似材料模拟实验、数值计算分析及现场观测数据,分析给出了这种特殊条件下概率积分预计的修正模型。结合工程实例综合分析了厚松散层厚坚硬条件下地表沉陷特征,为矿区的安全生产提供了理论依据。更多还原

【Abstract】 Mining row in Shaanxi Binchang mine is the coal-bearing seam of the Lower Jurassic Yanan Formation. Its surface covers with 60 to 140m thick layer of loess and the topography is the broken loess plateau with gully landforms. The overlying strata integrated lithology of the row is the medium hard rock, especially the Lower Cretaceous Luohe Formation (K1l), the Lower Cretaceous Yijun Formation (K1y), clay sandstone formation of Anding Formation seam 6 is in great thickness, high strength and hard lithology. It plays a role in controlling overlying rock damage under the conditions of certain mining scope. Therefore, under the mining of thick alluvium and thick hard rock, the study on the movement and deformation of the surface and the structure stability of overlying rock is of great significance to the production safety of Shaanxi Binchang mine.Founded on the feasibility study for protection to ground building of row exploitation of first mining working face 40301 in Binchang mining-Great Buddhist Temple and based on spot investigation and observation data, this paper analyzes features of subsidence damage affected by mining action under the conditions of thick alluvium and hard solid rock, combining the characters of thick layer of loess in physical mechanics. After applying cover rock supporting plate theory, the damage patterns and intensity and stiffness damage criteria are calculated and analyzed under the condition of thick alluvium and hard solid rock. According to the structural stability of hard rock supporting plate in the overlying strata of the coal seams, characters of the loess deformation and damage and the influence of the hard rock on the rock movement parameters, expected correction model through probability integration is given under this special condition, combined with similar material simulation experiments, numerical analysis, and field observation data. Then the characteristics of surface subsidence under the condition of thick alluvium and thick hard rock are analyzed with engineering instances, which provide a theoretical basis for the production safety of the mine.更多还原