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研究工作面前方煤岩体瓦斯渗透率分布对合理抽取瓦斯具有技术指导意义。通过简化孔隙、裂隙等效力学模型,建立标准圆柱煤岩体试件的等效力学模型,推导含单一裂隙的纯煤岩试样等效轴向、径向与体积应变,并推广应用到含多种裂隙的多种介质组合结构,通过试验验证理论力学模型具有较好的可靠性。以淮南张集矿11-2煤层工作面回采为原型,通过数值计算得到3种典型开采的支承压力峰值集中系数,并推导出支承压力与水平应力分布表达式,其能综合考虑开采条件、影响范围与采动卸压产生的体积膨胀变形。建立体积应变与渗透率之间的多项式关系式,并给出采动条件下不同开采方式下的体积应变分布曲线与渗透率分布曲线,根据其各阶段的特征差异划分为不同的阶段,为工作面抽采瓦斯提供了理论依据。
The gas permeability distribution of coal and rock mass in front of the research work surface has the technical guiding significance for the reasonable gas extraction. By simplifying the equivalent mechanical model of pores and fractures, the equivalent mechanical model of a standard cylindrical coal and rock mass specimen is established, and the equivalent axial, radial and volume strains of the pure coal rock sample with a single fracture are deduced. A variety of cracks in a variety of media composite structure, through the experimental verification of theoretical mechanics model has good reliability. Based on the mining of 11-2 coal seam in Zhangji Mine in Huainan, the support pressure peak concentration coefficient of three kinds of typical mining was obtained by numerical calculation, and the expression of support pressure and horizontal stress distribution was deduced. It can comprehensively consider the mining conditions and influence Range and mining pressure relief volume expansion deformation. Establish the polynomial relation between volumetric strain and permeability, and give the curve of volume strain distribution and permeability curve under different mining methods under mining conditions. According to the characteristic differences of each stage, it can be divided into different stages for work Surface gas extraction provides a theoretical basis.