潞安矿区井下地应力测量及分布规律研究

在山西潞安矿区的13个煤矿采用小孔径水压致裂地应力测量装置，完成了60个测点的原岩应力测量工作。实测数据表明：潞安矿区55%的测点最大水平主应力大于垂直主应力，由于受埋藏深度与地质构造影响，矿区内各矿地应力值差别较大，但地应力大小总体上属于中等地应力值；潞安矿区最大水平主应力方向从南到北变化较大，构造应力场呈现出多变的形态。在实测数据的基础上，绘制了潞安矿区地应力分布图；分析了地应力随埋藏深度的变化规律、平均水平主应力与垂直主应力的比值与埋藏深度的关系。煤矿井下地应力测量为井田开拓、巷道布置与支护设计等工程实践提供了可靠的基础参数，提高了工程设计的科学性、合理性与可靠性。

In-situ stress measurements and distribution laws in Lu’an underground coal mines

60 points of in-situ rock stresses have been measured in 13 coal mines of Lu’an coal mine area by means of hydrofracturing stress measurement rig with small borehole. The stress measurement data point out that: the maximum horizontal principal stresses on 55% of the total measuring points are greater than the vertical stresses in Lu’an coal mine area; and the in-situ stress values exist great differences in various mines because of different buried depths and geological structures. However, the magnitude of the stresses is generally moderate value. The orientations of the maximum horizontal principal stresses change greatly from southern part to northern part, the tectonic stress fields present changeable state. Based on the field data, the stress distribution map of Lu’an coal mine area was drawn up; the stress variation with buried depth, and the relation between the specific value of the mean horizontal principal stresses to the vertical stresses and buried depth were analysed. The stress measurement results provide reliable fundamental parameters for engineering practices, such as mine field development, roadway layout and support design, and improve the scientific degree, rationality and reliability of engineering designs.