【作者】 张培森；

【导师】 张文泉；

【作者基本信息】 山东科技大学 ， 采矿工程， 2005， 硕士

【摘要】 本文研究了煤层底板岩体在采动条件下的应力场及变形破坏特征,为探讨煤层底板突水机理奠定了一定的理论基础。论文采用理论分析与数值计算模拟分析相结合的研究方式,首先根据弹塑性理论求解了底板岩体在采动条件下的应力场及最大破坏深度;进而采用FLAC3D进行数值模拟,对采场煤层底板的应力状态及岩层运动规律进行分析,获得了一些规律性认识。其次,分析了底板节理岩体的破坏形式及强度影响因素,采用遍节点模型对含有一定夹角的两个弱面的岩样进行模拟分析,得出了一些结论。再次,分析了地下水对岩体的影响、固液耦合模式的理论和数值计算方法,进而模拟研究分析了固液耦合与非固液耦合之间的差别及在固液耦合模式下水压变化对节理岩体中应力场的影响,得到了一些认识。最后,结合刘桥一矿的水文地质和采矿条件进行了工程分析。 本文研究表明,运用理论分析与数值模拟方法,可以全面地揭示采动条件下底板岩体的应力场、变形破坏特征与破坏范围、深度,有利于选择、优化设计方案,同时减少试验时间、节省项目经费,提高矿井的经济效益与社会效益。更多还原

【Abstract】 The paper researched the stress fields and the deformation and breakage characters of rock mass in coal seam floor under the condition of mining, which is in order to establish definite theory base to discuss inrushing water mechanism in coal seam floor. The paper adopted associative research method between theory analysis and numerical simulation analysis. At first, based on elastic and plastic theory, the stress fields and most destroying depth are divided, which are in coal seam floor under the condition of mining; in succession, which are simulated by FLAC3D, and some rule knowledge are arrived by analyzing stress states and terrane moving rules in coal seam floor. Second, the paper analyzed destroying models and factors affecting strength of joint rock mass in coal seam floor, adopted ubiquitous-joint model to simulate and analyze rock sample including two interfaces which stands some kinds of angles between them, and arrived some conclusions. Again, the paper analyzed the effect that ground water affects rock mass, the theory of solid and fluid coupling model and the simulation calculating method, simulated and analyzed the difference between solid and fluid coupling mode and solid and fluid non-coupling mode, and the effect that the change of water power affects stress field of joint rock mass under the condition of solid and fluid coupling mode, and then arrived some knowledge. At last, combined with the hydrology geological and mining conditions of LiuQiao No.1 coal mine, the engineering is analyzed.Some conclusions are made clear through the paper. Using the theory analysis and numerical simulation method can open out the stress fields, deformation and destroying characters, and destroying range and depth of rock mass in coal seam floor under the condition of mining, which is propitious to select and optimize design projects, reduce the testing time and economize the project outlays, and then improve the economy benefit and society benefit.更多还原