首山一矿深部地应力分布规律及影响因素  

Distribution pattern and influencing factors of in-situ stress for deep levels in Shoushan No.1 Coal Mine

作　　者：郭德勇[1] 揣筱升 张铁岗 郭明生 GUO Deyong;CHUAI Xiaosheng;ZHANG Tiegang;GUO Mingsheng(School of Emergency Management and Safety Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;China Pingmei Shenma Energy and Chemical Group Co.,Ltd.,Pingdingshan 467000,China)

机构地区：[1]中国矿业大学(北京)应急管理与安全工程学院,北京100083 [2]中国平煤神马能源化工集团有限责任公司,河南平顶山467000

出　　处：《煤炭学报》2024年第5期2360-2375,共16页Journal of China Coal Society

基　　金：国家自然科学基金重点资助项目(41430640);国家自然科学基金联合基金重点资助项目(U1704242)。

摘　　要：为探讨平顶山首山一矿深部地应力分布规律及其影响因素,基于矿井实测地应力数据,运用构造物理学、岩石力学和数值模拟方法,研究了测点地应力类型、大小和方向分布规律,反演了地应力场分布特征,分析了埋深、岩性和地质构造对地应力的影响,确定了影响地应力分布的主控因素。研究表明:多元回归反演分析法获得的地应力计算值与实测值吻合,相对误差小于20%,结果可靠。矿井煤岩体处于三维压应力状态,煤层主应力关系为S_(H)>S_(V)>S_(h),地应力由矿井北部向南部呈现先增大后减小再增大的变化趋势,地应力为28~44 MPa,属于高应力水平,地应力方向为NEE向。埋深影响地应力大小和类型,随埋深增加主应力增大,应力场类型向准静水压力场过渡;岩性与地应力密切相关,从泥岩到砂岩或灰岩,地应力增大,弹性模量越大地应力越大,地层岩性的差异造成地应力大小离散分布、应力方向偏转角不超过10°;矿井地应力与埋深、弹性模量的关系可表示为σ_(H)=0.0350H+0.4681E−8.5513。地质构造是影响首山一矿地应力分布的主控因素,褶皱形态控制地应力的水平应力分布,向斜内弧应力值大于背斜内弧,且褶皱弯曲程度越大,其内弧地应力越大,应力梯度越大;断层带内应力降低、断层尖灭端应力集中,地应力方向沿着断层走向偏转,与断层走向夹角越大,应力方向偏转角越大;断层切割复式褶皱时,断层与向斜构造组合区应力值大于断层与背斜构造组合区,且断褶构造组合造成地应力方向分布紊乱。To investigate the distribution pattern and influencing factors of in-situ stress for deep levels in the Shoushan No.1 Mine,according to the measured in-situ stress data of the mine,the tectonophysics and rock mechanics and numerical simulation methods were applied to study the type,magnitude and direction distribution pattern of in-situ stress.The distribution characteristics of in-situ stress field was simulated.The effect of buried depth,lithology and geological structure on the in-situ stress distribution was analyzed.The main factor of in-situ stress distribution was determined.The research shows that the in-situ stress values obtained by the multiple regression analysis of inversion method are consistent with the measured values.The relative error is less than 20%and the results are reliable.The coal and rock mass of mine is in a state of three-dimensional compressive stress.The principal stresses relation of coal seam is S_(H)>S_(V)>S_(h).The in-situ stress increases firstly,then decreases and finally increases from the north to the south of the mine.The magnitude of in-situ stress is 28−44 MPa and belongs to the high stress level.The in-situ stress direction is NEE.The buried depth controls the magnitude and type distribution of the in-situ stress.With the increase of buried depth,the principal stress is increas-ing and the stress field type has the changing tendency from the dynamic stress field to quasi-hydrostatic pressure field.The lithology has a closely relationship with the in-situ stress.From mudstone to sandstone or limestone,the in-situ stress is increasing.The larger the elasticity module is,the higher the in-situ stress is.The difference of stratum lithology causes the discrete distribution of in-situ stress and the deflection angle of in-situ stress direction is less than 10°.The relation between the in-situ stress and the buried depth and the elasticity modulus is expressed as σ_(H)=0.0350H+0.4681E−8.5513 in the mine.The geological structure is the main controlling factor of in-situ st

关 键 词：地应力测量 应力解除法 构造物理 首山一矿 

分 类 号：TD311[矿业工程—矿井建设]