动压对底板巷道围岩变形破坏规律研究

Research on deformation and failure law of surrounding rock in floor roadway under dynamic pressure

为了研究动压对底板巷道围岩变形破坏规律,以动压影响底板巷道为对象,采用理论分析和数值模拟相结合的方法,开展了动压条件下巷道围岩弹塑性力学分析和底板巷道围岩变形破坏规律研究。研究得出,动压条件下塑性区的范围比静压条件下大1.2倍,巷道表面位移量比静压条件下增大2.4倍;随着工作面的推进,巷道围岩等效应力峰值逐渐增大,并且远离巷道表面,塑性区和破裂区呈非对称性、极不均匀,底板、左拱部和右拱部产生了“三角形”裂隙分布,围岩变形破坏呈现“倒花盆”型。研究为沿空动压巷道支护方式的确定提供了依据。

In order to study the law of deformation and failure of surrounding rock of floor roadway under dynamic pressure,taking the influence of dynamic pressure on the floor roadway as the object,the elastic-plastic mechanics analysis of surrounding rock of floor roadway under dynamic pressure and the law of deformation and failure of surrounding rock of floor roadway were studied by combining theoretical analysis with numerical simulation.It is found that the plastic zone under dynamic pressure is 1.2 times larger than that under static pressure,and the surface displacement of roadway is 2.4 times larger than that under static pressure;with the advancement of the work surface,the peak value of the equivalent stress of the roadway surrounding rock gradually increases,and it is far from the surface of the roadway,the plastic and fracture areas are asymmetric and extremely uneven,the bottom plate,the left arch and the right arch produce a "triangular" fracture distribution,the deformation and destruction of the surrounding rock presents an "inverted flowerpot" type.The research provides a basis for the determination of the support method of the roadway along the pneumatic pressure.