砚北煤矿地应力测量及其特征分析

MEASUREMENT AND CHARACTERISTICS ANALYSIS OF IN-SITU STRESSES OF YANBEI COAL MINE

为了弄清华亭矿区砚北煤矿矿井动力现象和巷道剧烈变形破坏的机制与特征,采用空心包体应力解除法,对砚北煤矿进行了地应力测量。结果表明,该区地应力以水平压应力为主,具有明显的构造应力特征,实测最大主应力为 14.49～16.88 MPa,方向与测点处构造形态基本一致,即基本与煤岩层走向垂直;从应力的绝对值看,该区地应力场属正常偏高情况,而不属于高应力区域,但最大与最小主应力的差值较大(差值为 9.85～10.51 MPa)。地应力场表现出明显的不均匀性,其大小和方向有较大差异,这是该地区地质环境及演化、地质构造特征和煤岩特征等共同影响的结果。

In order to reveal the mechanism and characteristics of the dynamic phenomena, large deformation and failure of the tunnel at Yanbei mine, Huating mining area, the in-situ stresses of Yanbei coal mine is measured by the hollow inclusion stress-relief method. The result shows that the horizontal in-situ stress is the major principal stress in this area, and the stress has obvious character of the tectonic stress. The major principal stress is between 14.1-16.88 MPa, and its direction is basically according with the tectonic conformation at the survey point, which is the direction basically normal to the strike of the coal seam and strata. The magnitude of in-situ stress is not high, but the difference between the major and minor principal stresses is great, which is 9.85-10.5 MPa. The in-situ stress field shows obvious inhomogeneity, which results from the affection of some factors, such as geological environment and its evolution, tectonic character, properties of coal and strata, and so on.