承压水上断层活化突水采动效应及其影响因素研究

发布时间：2018-08-03 18:47

【摘要】：矿井水害严重威胁着煤矿的安全生产。随着开采深度、开采强度的增大,回采工作面受底板奥灰岩溶水的威胁日益严重,使得底板突水预测及防治问题更为突出。因此,有必要开展承压水上采动断层活化突水机理及其影响因素的研究,从而保证矿井安全带压开采。论文采用理论分析、数值模拟,结合现场物探的手段,对承压水上工作面内采动断层活化突水过程及其影响因素进行研究,获得以下主要成果:(1)依据矿山压力与岩层控制理论,建立承压水上采动断层活化突水力学模型,推导采动断层活化力学判据、活化临界倾角;并基于岩体极限平衡理论,推导承压水上采动断层活化突水临界水压计算公式,分析断层倾角、断层力学性质(断层内摩擦角、内聚力)、采空区悬顶距离、工作面至断层距离、底板岩层厚度(完整岩层带)等因素对断层活化突水临界水压的影响规律。(2)采用FLAC-3D数值模拟软件,建立承压水上含断层煤层开采的三维流固耦合数值模型,模拟分析不同倾角断层、不同落差断层、不同含水层水压断层在采动应力和含水层水压共同作用下,工作面回采过程中引起的断层围岩垂直应力、剪应力、塑性区以及孔隙压力渗流矢量的变化,获得断层倾角、断层落差、含水层水压等因素对承压水上采动断层活化突水的影响规律。(3)结合恒源煤矿现场水文地质资料,采用理论分析、数值模拟、现场物探等手段对回采工作面内采动断层活化突水的危险性进行分析,通过断层围岩提前注浆改造的办法,实现了承压水上含断层煤层的安全带压开采。
[Abstract]:Mine water damage is a serious threat to the safety of coal production. With the increase of mining depth and mining intensity, the mining face is threatened by Ordovician limestone karst water more and more seriously, which makes the prediction and prevention of floor water inrush more prominent. Therefore, it is necessary to study the mechanism of activated water inrush of mining fault on confined water and its influencing factors, so as to ensure the mining of mine seat belt pressure. In this paper, theoretical analysis, numerical simulation and field geophysical exploration are used to study the process of activated water inrush of mining fault and its influencing factors. The main results are as follows: (1) according to the theory of mine pressure and strata control, Based on the theory of rock mass limit equilibrium, the calculation formula of critical water pressure of activated water inrush of mining fault on confined water is derived based on the rock mass limit equilibrium theory, and the activation hydraulic model of mining fault on confined water is established, and the criterion of activation mechanics of mining fault and critical inclination angle of activation are derived. Analysis of fault dip angle, fault mechanical properties (internal friction angle, cohesive force), the distance between hanging roof in goaf, distance from face to fault, The influence of the thickness of floor rock layer (complete rock zone) on the critical water pressure of water inrush from fault activation is studied. (2) the three-dimensional fluid-solid coupling numerical model of coal seam mining with fault on confined water is established by FLAC-3D numerical simulation software. Under the action of mining stress and aquifer water pressure, the vertical stress and shear stress of surrounding rock caused by different dip fault, different drop fault and different aquifer hydraulic pressure are simulated and analyzed. The influence of factors such as fault dip angle, fault drop and aquifer water pressure on activated water inrush of mining fault on confined water is obtained by changing the seepage vector of plastic zone and pore pressure. (3) combined with hydrogeological data of Hengyuan coal mine, By means of theoretical analysis, numerical simulation and field geophysical exploration, the risk of activated water inrush of mining fault in mining face is analyzed, and the method of grouting ahead of time is adopted to reconstruct the surrounding rock of fault. The seatbelt pressure mining of coal seam with fault on confined water is realized.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD745

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