复采工作面通过条带式残采区覆岩稳定性特征研究

Study on overlying strata stability characteristics of re-mining face crossing roadway residual mining area

为了制定条带式残采区复采的合理开采方式,以西河煤矿3^#煤层条带式残采区为工程背景,采用三维相似模拟和数值模拟相结合的方法,研究复采工作面通过条带式残采区引起的覆岩运移变形特征和稳定性演化规律。模拟结果表明:当工作面与条带式残采区斜交角度在30°以上时,采场前方覆岩破坏形成的剪切破坏区域和拉伸破坏区域呈现出独立的变化特征,工作面前方煤柱和顶板会对上覆岩层形成有效的支撑作用;旧采残煤复采过程中顶板垮落以分段、分步、局部零星的多次垮落方式为主,工作面整体的矿压显现并不十分强烈。研究表明:复采工作面通过条带式残采区时工作面与巷道呈30°夹角布置是合理可行的。

In order to formulate a reasonable mining method for roadway residual mining area,taking the roadway residual mining area of 3^# coal seam in Xihe Coal Mine as the engineering background,the method of combining three-dimensional similarity simulation with numerical simulation was adopted,the characteristics of overburden movement and deformation,as well as the stability evolution law caused by re-mining face passing roadway residual mining area were studied.The simulation results show that when the oblique angle between the working face and the roadway residual mining area is above 30°,the shear failure zone and tensile failure zone formed by overburden failure in front of the stope show independent change characteristics,the coal pillar and roof in front of the working face will form an effective supporting effect on the overlying strata;roof caving in the re-mining process of old residual coal is mainly in the form of several caving in sections,step by step and scattered locally,and the overall strata pressure of the working face is not very strong.The results show that it is reasonable and feasible to arrange the working face and roadway at an angle of 30°when the re-mining face passes the roadway residual mining area.