1. College of Mining and Safety Engineering,Shandong University of Science and Technology,Qingdao　 266590,China; 2. College of Foreign Languages, Shandong University of Science and Technology,Qingdao　 266590,China; 3. China Construction Seventh Engineering Dividion Corp. ,Ltd. ,Zhengzhou　450004,China

为研究倾斜煤层底板破坏主控因素对底板破坏深度的敏感性,根据弹性力学中的半无限体理论建立了沿煤层倾斜方向底板破坏深度求解力学模型,计算了倾斜煤层底板采动最大破坏深度。以阳城煤矿的采场条件为工程背景,基于FLAC3D数值仿真软件,按照正交试验设计方案对3306工作面底板破坏特征进行数值模拟。运用矩阵分析法以及方差分析法对模拟结果进行分析计算,确定各主控因素对底板破坏深度的敏感性。研究表明:(1)随着工作面推进距离的增大,底板最小主应力值与承压水压值越来越接近,且最小水平主应力与底板承压水压相等的区域不断扩大,底板突水危险性增加。(2)各主控因素对底板破坏深度影响的主次顺序为:工作面斜长>采深>黏聚力>采厚>煤层倾角>水压>内摩擦角,方差分析结果显示,各主控因素中工作面斜长对底板破坏深度的敏感度为高度显著;采深较为显著;黏聚力显著;采厚、煤层倾角、水压以及内摩擦角不显著。(3)运用矩阵分析法确定了正交模拟试验的最优方案,即按照此方案实施后底板破坏深度最小,可有效降低矿井底板突水的危险性。

In order to study the sensibility of coal seam floor damage depth from the main factors of the inclined coal seam floor,based on the semi-infinite body theory in elastic mechanics,a mechanical model was established to model the floor damage depth along the inclined direction of coal seam,and the maximum floor mining damaged depth of in- clined coal seam was calculated. Under the project background of stope conditions of Yangcheng Coal Mine,based on the FLAC3D numerical simulation software,and in the way of orthogonal test,a numerical simulation was made to simu- late the characteristics of coal seam floor damage in 3306 working face. Furthermore,this paper made a calculation to the simulated result in the way of matrix analysis and variance components method to identify the sensibility of each factor influencing the depth of coal seam floor damage. Research shows:① with the increase of the propulsive distance of working face,the minimum principal stress value of the floor is more similar to the confined water pressure value,and the equal areas between the minimum horizontal principal stress value and floor confined water pressure value are in continuous expansion and the danger of floor water inrush increases;② the order of each factor that influences floor damage depth as follows:stope width,mining depth,cohesive force,mining thick,coal seam dip angle,hydraulic pres- sure,and internal friction angle. And the variance analysis results show that the order of sensibility of each factor that influences floor damage depth as follows:the apparent factors are stope width,mining depth,and cohesive force. How- ever,the unapparent factors are mining thick,coal seam dip angle,hydraulic pressure,and internal friction angle;③ the optimal scheme of orthogonal simulation experiment test is determined by matrix analysis method,which can effec- tively reduce the danger of floor water inrush with the minimum floor failure depth.

国家自然科学基金资助项目(51274135)；国家“863”高技术研究发展计划资助项目(2015AA016404-4)；

Liu Weitao,Mu Dianrui,Yang Li,et al. Calculation method and main factor sensitivity analysis of inclined coal floor damage depth[ J]. Journal of China Coal Society,2017,42(4):849-859.