棉花坑矿井地应力测量及其应力状态分析

Geostress Measurement and State Analysis of Mianhuakeng Mine

地应力测量是确定工程岩体力学属性,进行围岩稳定性分析,实现岩石工程开挖设计和决策科学化的前提条件。随着棉花坑矿井开采深度的不断增加,复杂构造应力对巷道和采场围岩稳定性产生的影响日趋显现。为了掌握该矿深部岩体地应力分布情况,提高井下工程设计的科学性、安全性和经济合理性,采用空心包体应力解除法对该矿开展地应力测量研究,分析其应力状态和分布规律。研究结果表明,在该矿区埋深615~715 m范围内,水平最大主应力为22.5~29.8 MPa,最大主应力与垂直应力分量之比为1.5~1.7;各主应力大小随深度增加呈线性增长;各测点水平最大主应力方向具有较强的一致性,介于91.2~110.3°,为北西西-南东东方向。

Geostress measurement is a necessary prerequisite for determining the attributes of engineering rock body mechanics,analyzing the stability of the surrounding rock,and realizing the scientific excavation design and decision-making of rock engineering.With the depth of mining of Mianhuakeng mine,the impact of complex structural stress on the stability of the lane roads and lying surrounding rocks has become increasingly apparent.In order to master the terrain distribution of the rock body in the deep part of the mine and improve the scientific,safety and economic rationality of the underground engineering design,the hollow inclusion stress relief method is used to carry out the stress measurement of the mine,and analyze its stress status and distribution rules.The results show that the maximum main stress is between 22.5 and 29.8 MPa and the ratio of the maximum main stress to vertical stress is 1.5~1.7 in the buried depth of 615~715 m.The main stress increases linearly with the depth and the maximum main stress direction of each measurement point level is in the direction of from 91.2 to 110.3°(North West West-South East East),which has a strong consistency.