童亭煤矿主副井破裂调查及其成因分析

在详细调查的基础上,通过对井壁破裂面特征的研究,显示出井壁的破坏荷载是水平作用力、并指出这二个井壁破裂的主要原因是在该煤矿开采后,由于矿井排出新生界底部含水层的水,在表土层底部及基岩风化带内产生较高的动水压力及渗透变形,使井筒遭受不均匀地压所致。

A Study on the Cause of Shaft Rupture in Tongting Coal Mine

Based on an in-depth investigation,the factors leading to the rupture of both the main and auxiliary shafts in Tongting Coal Mine are analyzed and described in this paper. As evidenced by the mechnical properties of the fractural surface, the driving force which led to the final rupture of shaft walls is external and horizontal in origin. The rupture was resulted from the penetration of walls through the unconformity contact between the base aquifer of the Ccnozoic overburden and the underlying weathering zone of bedrocks. The groundwater circulating through the unconformity contact zone was dramatically drawn down into the mine , leading to an increase in hydrodynamic force and seepage deformation and creating a non-homogeneous earth pressure in this zone of weakness, which caused the final rupture of the shafts in a predominantly shearing stress field.