基于岩石物理力学参数的岩层强度指数计算方法及分类标准  

Calculation method and classification standard of rock stratum strength index based on petrophysical and mechanical parameters

作　　者：李回贵 王军 李化敏[3] 刘凯[2] 贠庆龙[2] LI Huigui;WANG Jun;LI Huamin;LIU Kai;YUN Qinglong(College of Mining Engineering,Guizhou University of Engineering Science,Bijie 551700,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]贵州工程应用技术学院矿业工程学院,贵州毕节551700 [2]中国矿业大学(北京)能源与矿业学院,北京100083 [3]河南理工大学能源科学与工程学院,河南焦作454000

出　　处：《中国矿业》2023年第5期169-175,共7页China Mining Magazine

基　　金：贵州省科技计划项目资助(编号:黔科合基础-ZK[2023]一般124);贵州省科技支撑项目资助(编号:黔科合支撑[2019]2876号);贵州省教育厅自然科学基金资助(编号:黔教合KY字[2019]166);毕节市自然科学基金资助(编号:毕科联合字G[2019]5号)。

摘　　要：围岩稳定性分类是井工煤矿进行支护设计的关键依据,而岩石的物理力学参数是围岩强度分类分级的重要指标。为此,在研究神东矿区煤系地层岩石物理力学性质的基础上,通过理论分析与现场实测的方法研究了岩石的物理力学参数与岩层强度之间的关系,提出了一种基于岩石物理力学参数的岩层(岩体)强度指标计算公式及岩性序列分类方法,将岩层稳定性以岩层强度指数分为极软弱岩层、软弱岩层、中等坚硬岩层、坚硬岩层、极坚硬岩层五类;揭示了岩层强度与岩石力学性能之间的关系,建立了岩石物理力学性质与岩层(岩体)之间的联系,并根据岩层(岩体)强度指标计算公式计算了神东矿区大柳塔5-2煤层上覆岩层的强度指数,并对其强度指数进行了分类,得出5-2煤层直接顶岩层属于Ⅱ类坚硬岩层,基本顶属于Ⅰ类极坚硬岩层;探讨了5-2煤层上覆岩层的强度指数与矿压显现及岩层运动的关系,揭示了大柳塔煤矿初次来压步距大与地表下层速度快的内因。The classification of surrounding rock stability is the key basis for supporting design in underground coal mines,and the physical and mechanical parameters of rock are important indicators of the classification and classification of surrounding rock strength.Therefore,on the basis of studying the physical and mechanical properties of the coal measure strata in Shendong Mining Area,this paper studies the relationship between the physical and mechanical parameters of the rock and the strength of the rock formation by means of theoretical analysis and field measurement.The calculation formula of the strength index of the rock layer(rock mass)of the mechanical parameters and the classification method of the lithological sequence,the stability of the rock layer is divided into five categories which very soft rock layer,soft rock layer,medium hard rock layer,hard rock layer,and extremely hard rock layer according to the rock stratum strength index.The relationship between the strength of the rock formation and the mechanical properties of the rock is revealed,the connection between the physical and mechanical properties of the rock and the rock formation(rock mass)is established.The strength index of the overlying strata of the coal is classified and the strength index is classified,and it is concluded that the 5-2 coal direct roof strata belonged to theⅡhard rock strata,and the basic top belonged to theⅠextremely hard rock stratum.The relationship between the strength index of the overlying strata of 5-2 coal,the appearance of rock pressure and the movement of strata is discussed.The internal causes of the large first-time pressure step and the fast subsurface velocity of the Daliuta Coal Mine are revealed.

关 键 词：神东矿区 岩层强度指数 物理力学性质 矿压显现 

分 类 号：TD713[矿业工程—矿井通风与安全]