变质量破碎泥岩渗透性的加速试验研究
发布时间：2018-07-17 04:41
【摘要】：含陷落柱煤层开采时，由于水的溶蚀、冲蚀和磨蚀作用，陷落柱的孔隙度和渗透性参量随时间变化，，常常发生水流形态的转变，引发突水灾害。变质量破碎岩体渗流研究成为陷落柱突水灾害防治的基础课题。陷落柱突水前，经历了长时间的质量流失，加速渗透试验是模拟陷落柱质量迁移和流失的有效手段。本文对质量流失过程中破碎岩体的渗透性进行加速试验研究，取得如下研究成果： （1）研制了能够体现溶蚀、冲蚀和磨蚀效应的变质量破碎岩石渗透试验系统，本系统由轴向加载及位移控制子系统、渗透子系统、数据采集与分析子系统和细小颗粒回收子系统构成，可满足泵站式和注射器式两种方式渗透试验的要求，两种渗透方式切换自如。 （2）分析了溶蚀、冲蚀、磨蚀作用下破碎岩石的质量变化过程，建立了质量流失率和表观毛密度变化率的表达式，解释了破碎岩石质量迁移和流失的机理。 （3）通过变质量破碎泥岩渗透加速试验，建立了质量流失率与孔隙度、时间的函数关系，并构造了函数形状参数的遗传算法；得到了Talbol幂指数和初始孔隙度对质量流失率的影响规律。 （4）通过变质量破碎泥岩渗透加速试验，构建了变质量破碎泥岩渗透性参量的遗传算法，得到不同Talbol幂指数和初始孔隙度下渗透率、非Darcy流β因子和加速度系数的变化规律。 （5）通过变质量破碎泥岩水流形态转变试验，得到了水流形态转变前质量流失时间、流失总质量与Talbol幂指数、初始孔隙度、压力梯度的关系，建立了水流形态转变条件，运用质量流失的观点解释了破碎泥岩渗流失稳机理。 （6）考虑了加速因子对质量流失率的影响，构建了变质量破碎岩体渗流系统动力学模型，设计了系统响应计算方法，模拟了任意Talbol幂指数、任意初始孔隙度和任意压力梯度下破碎岩石质量流失率、孔隙度、渗透率、非Darcy流β因子、加速度系数、压力和渗流速度的时变过程。
[Abstract]:In coal seam mining with subsided columns, the porosity and permeability parameters of collapse columns vary with time due to the erosion, erosion and erosion of water, which often result in the change of water flow form and cause water inrush disaster. Seepage analysis of broken rock mass with variable mass has become the basic subject of water inrush disaster prevention of collapse column. Before the collapse column inrush water, it has experienced a long time of mass loss, and accelerated permeation test is an effective means to simulate the mass migration and loss of the collapse column. In this paper, the permeability of broken rock mass in the process of mass loss is studied by accelerated test, and the following research results are obtained: (1) A permeability test system for fractured rock with variable mass, which can reflect the effects of dissolution, erosion and erosion, is developed. The system consists of axial loading and displacement control subsystem, penetration subsystem, data acquisition and analysis subsystem and fine particle recovery subsystem. (2) the mass change process of broken rock under the action of dissolution, erosion and abrasion is analyzed, and the expressions of mass loss rate and apparent wool density change rate are established. The mechanism of mass migration and loss of broken rock is explained. (3) through accelerated permeability test of broken mudstone with variable mass, the function relationship between mass loss rate and porosity and time is established, and the genetic algorithm of function shape parameter is constructed. The influence of Talbol power exponent and initial porosity on mass loss rate is obtained. (4) genetic algorithm for permeability parameters of variable mass broken mudstone is constructed by accelerated permeability test of fractured mudstone with variable mass. The variations of permeability, non-Darcy flow 尾 factor and acceleration coefficient under different Talbol exponents and initial porosity are obtained. (5) the mass loss time before the change of flow pattern is obtained through the flow pattern transformation test of broken mudstone with variable mass. The relationship between total mass loss and Talbol power exponent, initial porosity, pressure gradient, and the condition of flow pattern transformation are established. In this paper, the mechanism of seepage instability of broken mudstone is explained from the viewpoint of mass loss. (6) considering the influence of acceleration factor on mass loss rate, the dynamic model of seepage system of fractured rock mass with variable mass is constructed, and the calculation method of system response is designed. The time-varying processes of mass loss rate, porosity, permeability, non-Darcy flow 尾 factor, acceleration coefficient, pressure and seepage velocity of broken rock under arbitrary Talbol exponent, arbitrary initial porosity and arbitrary pressure gradient are simulated.
【学位授予单位】：中国矿业大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TD745
本文编号：2129051
[Abstract]:In coal seam mining with subsided columns, the porosity and permeability parameters of collapse columns vary with time due to the erosion, erosion and erosion of water, which often result in the change of water flow form and cause water inrush disaster. Seepage analysis of broken rock mass with variable mass has become the basic subject of water inrush disaster prevention of collapse column. Before the collapse column inrush water, it has experienced a long time of mass loss, and accelerated permeation test is an effective means to simulate the mass migration and loss of the collapse column. In this paper, the permeability of broken rock mass in the process of mass loss is studied by accelerated test, and the following research results are obtained: (1) A permeability test system for fractured rock with variable mass, which can reflect the effects of dissolution, erosion and erosion, is developed. The system consists of axial loading and displacement control subsystem, penetration subsystem, data acquisition and analysis subsystem and fine particle recovery subsystem. (2) the mass change process of broken rock under the action of dissolution, erosion and abrasion is analyzed, and the expressions of mass loss rate and apparent wool density change rate are established. The mechanism of mass migration and loss of broken rock is explained. (3) through accelerated permeability test of broken mudstone with variable mass, the function relationship between mass loss rate and porosity and time is established, and the genetic algorithm of function shape parameter is constructed. The influence of Talbol power exponent and initial porosity on mass loss rate is obtained. (4) genetic algorithm for permeability parameters of variable mass broken mudstone is constructed by accelerated permeability test of fractured mudstone with variable mass. The variations of permeability, non-Darcy flow 尾 factor and acceleration coefficient under different Talbol exponents and initial porosity are obtained. (5) the mass loss time before the change of flow pattern is obtained through the flow pattern transformation test of broken mudstone with variable mass. The relationship between total mass loss and Talbol power exponent, initial porosity, pressure gradient, and the condition of flow pattern transformation are established. In this paper, the mechanism of seepage instability of broken mudstone is explained from the viewpoint of mass loss. (6) considering the influence of acceleration factor on mass loss rate, the dynamic model of seepage system of fractured rock mass with variable mass is constructed, and the calculation method of system response is designed. The time-varying processes of mass loss rate, porosity, permeability, non-Darcy flow 尾 factor, acceleration coefficient, pressure and seepage velocity of broken rock under arbitrary Talbol exponent, arbitrary initial porosity and arbitrary pressure gradient are simulated.
【学位授予单位】：中国矿业大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TD745
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