阳泉矿区主采煤层地应力分布规律实测研究  

Field measurement research on in-situ stress distribution law of main coal seams in Yangquan miningarea

作　　者：何杰[1,2,3] 吴拥政 程蓬[1,2,3] 范军平 吴乐[1,2,3] 武龙云 HE Jie;WU Yongzheng;CHENG Peng g;FAN Junping;WU Le;WU Longyun(Coal Mining and Designing Branch,China Coal Research Institute,Beijing g100013,China;CCTEG Coal Mining Research Institute,Beijing 100013,China;Coal Mining and Design Department,Tiandi Science and Technology Co Ltd,Beijing g 100013,China;Intelligent Mine Department,Huayang New Material Technology Group Co Ltd,Yangquan,Shanxi 045000,China)

机构地区：[1]煤炭科学研究总院开采研究分院,北京100013 [2]中煤科工开采研究院有限公司,北京100013 [3]天地科技股份有限公司开采设计事业部,北京100013 [4]华阳新材料科技集团有限公司智能矿山事业部,山西阳泉045000

出　　处：《采矿与安全工程学报》2023年第6期1191-1200,共10页Journal of Mining & Safety Engineering

基　　金：天地科技股份有限公司科技创新创业专项项目(2021-TD-MS011);国家自然科学基金项目(52174080)。

摘　　要：阳泉矿区地质构造形态属于大型不规则单斜构造,以叠加褶皱为主。采用小孔径水压致裂地应力测量装置,开展8对煤矿4层煤层巷道36处测点原位测试及分布规律研究。研究结果表明:阳泉矿区原岩应力总体以水平应力为主,属于构造应力场类型(σH>σv>σh),埋深较大的9#煤和8#煤局部所在区域属于自重应力场类型(σv>σH>σh)。矿区主采3#煤、8#煤和9#煤所处区域地应力值属于中等应力值水平,15#煤所处区域属于中等偏高应力值水平,最大水平主应力值为25.12MPa。基于实测数据,绘制了阳泉矿区地应力分布图,最大水平主应力具有明显的方向性和区域性,66.67%的测点最大水平主应力集中在NNE方向且分布在矿区中西部,而矿区南部最大水平主应力集中在NNW方向,水平地应力方向在桃河向斜附近发生偏转,这由该区域强烈叠加褶皱发育及桃河弧形向斜造成。水平主应力差值随着埋深增加而增大,但相同埋深下不同煤层所处区域水平主应力差值差别大、离散性强,这与不同煤层区域受褶皱运动影响差异大有关;矿区水平主应力差比集中在0.5附近,水平主应力差值大导致井下煤体受较大剪应力,稳定性差。获得了平均水平主应力与垂直主应力的比值k随深度变化关系式,且k值落在霍克-布朗内外包络线之内。研究成果对于阳泉矿区煤矿巷道围岩控制具有重要的参考价值。The geological structure of Yangquan mining area is a large irregular monoclinal structure,mainly formed with superimposed fold structure. In this paper,a small aperture hydraulic fracturing insitu stress measuring device was adopted to carry out the field measurements in eight coal mines with36measuring points in total,so as to study the distribution law of in-situ stress. The results show that the original rock stress is mainly horizontal stress belonging to the type of structural stress field(σH> σv>σh),and the9# coal and8# coal with large buried depth belong to the type of self-weight stress field(σv> σH> σh). The in-situ stress values of main mining3# coal, 8# coal and9# coal belong to medium stress level, 15# coal belongs to medium high stress level,and the maximum horizontal principal stress value is25. 12MPa. Based on the measured data,the in-situ stress distribution map is depicted. The direction of the maximum horizontal principal stress has obvious directionality and regionality.66. 67% of the measured points have the maximum horizontal principal stress direction in the NNE direction,which concentrates in the middle and west of the mining area,but the south of the mining area is concentrated in the NNW direction. The horizontal stress direction deflects near the Taohe syncline,which is related to the development of strong superimposed folds and Taohe arc syncline folds in this area. The difference of horizontal principal stress increases with the buried depth,but the difference of principal stress in different coal seams under the same buried depth is large and discrete,which is caused by the variation of different coal seams affected by the fold horizontal tectonic movement;The difference ratio of the horizontal principal stress is concentrated near0. 5,and the large principal stress difference leads to large shear stress and poor stability of underground coal. A rational expression is explored to correlate the ratio(k)of average horizontal principal stress and vertical principal stress with the

关 键 词：阳泉矿区 多煤层 水压致裂 地应力 分布规律 

分 类 号：P618.11[天文地球—矿床学]