Yangchangwan Coal Mine, Ningxia Coal Industry Co., Ltd.

羊场湾煤矿地质构造多断层,部分区域煤层倾角大,矿压显现明显。为掌握该矿区地应力场分布规律,采用空心包体应力计对13、14、15、31四个采区共12个测点进行地应力测量,结合现场测量数据、回归拟合等方法分析其地应力场的类型、水平主应力方向、地应力大小和地应力随埋深的变化关系以及侧压比等参量的变化规律。结果表明:水平应力方向性影响显著,属于典型的构造应力场类型(σH>σv>σh);该矿井中等地应力值占比最大,水平主应力方向均为NW向,埋藏深度越深,最大、最小水平主应力值越大,但有一定的离散性;侧压比范围在1.16~1.48,得到了平均侧压比k随埋深的变化关系式,与霍克-布朗提出的曲线形态类似。研究成果为羊场湾煤矿巷道合理布置、围岩控制提供数据参考。

The geological structure of Yangchangwan Coal Mine is characterized by multiple faults, with some areas having large coal seam inclination angles and obvious mine pressure behavior. In order to grasp the distribution law of the geostress field in this mining area, hollow package body stress gauge is used to measure the geostress at 12 measuring points in four mining areas, namely 13, 14, 15, and 31. Combined with the on-site measurement data, regression fitting and other methods, the type of their geostress fields, horizontal principal stress direction, magnitude of geostress, the variation relationship of geostress with burial depth, and the variation law of parameters such as lateral pressure ratio are analyzed. The results show that the directional influence of horizontal stress is significant, belonging to the typical type of tectonic stress field (σ>σ>σ). The proportion of medium geostress values in this mine is the largest, and the direction of horizontal principal stress is NW way. The deeper the burial depth, the larger the maximum and minimum horizontal principal stress values, but there is a certain degree of discreteness. The range of lateral pressure ratio is 1.16-1.48, and the variation relationship formula of the average lateral pressure ratio k with burial depth is obtained, which is similar to the curve shape proposed by Hooke-Brown. The research results provide data reference for the rational layout and surrounding rock control of Yangchangwan coal mine tunnels.