松散含水层下开采对覆岩承载破坏规律的影响

The Influence of Mining Under Loose Aquifer on Bearing Damage Laws of Overlying Strata

采用数值模拟的实验方法,就松散含水层对覆岩破坏规律的影响进行了研究。研究结果表明:覆岩破坏后,可以划分为拉伸变形区、拉伸破裂区、剪切变形区和未变形区。在松散含水层的载荷传递作用下,作用在基岩顶界面的载荷较大,由于基岩较薄,采场覆岩易发生整体弯曲下沉,造成工作面覆岩破坏高度、工作面支承压力、采空区上部和侧向裂隙分布范围增大,与无松散含水层相比,工作面的压力明显增加。

Using the experimental method of the numerical simulation, the influence of loose aquifer on overburden failure laws is stud- ied. The results show that the overburden failure can be divided into tensile defbrmation zone, the tensile rupture and shear detbrmation zone and deformation zone. In the process of load transter of loose aquifer, the load in the top of the bedrock interface is larger, for the reason that the bedrock is thinner and mining overlayer strata is vulnerable to overall bending sinking, which causes the increase of damage height of overburden rock face, face supporting pressure and the upper and lateral fracture distribution range. Face pressure in- creases significantly compared with no loose aquifer.