晋城矿区地应力场研究及应用

 随着矿井开采深度与强度的不断增加，地应力对围岩变形与破坏的影响更加突出，在煤矿矿区进行地应力测量，并分析地应力场分布特征具有重要意义。在晋城矿区，采用小孔径水压致裂地应力测量装置，进行10个煤矿、62个测点的二维与三维地应力测量。实测数据表明：晋城矿区原岩应力以水平应力为主，构造应力占绝对优势，属于典型的构造应力场类型；地应力值属于中等水平；矿区东部与西部水平主应力方向变化较大，主要原因是受晋获褶断带的影响。基于实测数据，绘制晋城矿区地应力分布图；采用回归方法分析地应力随埋藏深度的变化规律；论述水平主应力与垂直主应力的比值同埋藏深度的关系，并与霍克–布朗包线进行比较。选择典型矿井，将地应力测量结果应用于巷道布置与支护设计，根据地应力场分布特征提出合理的巷道轴线布置方向，并在井下应用中得到验证。井下地应力测量为晋城矿区提供了可靠的基础数据，对指导矿区井田开拓、巷道布置与支护设计、采煤方法的选择等工程实践具有重要参考价值。

RESEARCH ON IN-SITU STRESS FIELD IN JINCHENG MINING AREA AND ITS APPLICATION

With the increases of coal mining depth and intensity，the in-situ stresses play more important roles in the displacement and damage of surrounding rock. It is very important to take in-situ stress measurements and analyze the distribution characteristics of the in-situ stress fields in coal mining area. 62 points of stress measurements(including plane and three-dimensional tests) have been conducted in 10 coal mines of Jincheng coal mining area by means of the hydraulic fracturing stress measurement rig with small borehole. The stress measurement data indicate that：the in-situ stress field in Jincheng coal mining area，in which the tectonic stress takes absolute predominance，is dominated by horizontal stress and belongs to typical tectonic stress field. The magnitudes of the stresses are moderate values. The orientations of the maximum horizontal principal stresses change greatly from eastern part to western part because of the effect of Jincheng—Huolu folded and faulted zone. Based on the field data，the stress distribution map on Jincheng coal mining area is drawn up. The stress variation law with buried depth is analyzed；and the relation between the ratio of the horizontal principal stresses to the vertical stresses and buried depth is discussed in contrast to Hoek-Brown envelope curve. The measured stress results have been applied to roadway layout and support design in typical mines；and the rational axis orientations of roadways have been determined according to the stress field distribution，which has been verified by underground application. The underground stress measurements provide reliable basic data for Jincheng coal mining area，and important consulting value for guiding mining engineering practices，such as mine field development，roadway layout，support design，and selection of mining methods，etc.. ；application