• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
基于断层摩擦强度的地应力计算模型与应用
  • Title

    Calculation model of in-situ stress based on fault frictional strength and its application

  • 作者

    孟召平尹可章朋

  • Author

    MENG Zhaoping,YIN Ke,ZHANG Peng

  • 单位

    中国矿业大学(北京)地球科学与测绘工程学院山西晋城无烟煤矿业集团有限责任公司煤与煤层气共采国家重点实验室

  • Organization
    1.College of Geosciences and Surveying Engineering,China University of Mining and Technology (Beijing),Beijing ,China;2.State Key Laboratory of Coal and CBM Co-mining,Shanxi Jincheng Anthracite Mining Group Co.,Ltd.,Jincheng ,China
  • 摘要

    断层摩擦强度是煤岩层地应力的限定条件,如何评价断层摩擦强度是煤与煤层气开采值得考虑的问题,分析了断层摩擦强度和其对地应力的约束机制,建立了最大与最小主应力比值与断层摩擦强度的相关关系和地应力计算模型。研究结果表明:煤岩层中有效最大主应力与最小主应力比值受断层摩擦强度的限制,当其比值达到临界方向断层的摩擦强度极限时,断层就会发生滑动;根据Anderson断层分类,将原岩应力分为3种应力状态,在此基础上,建立了考虑断层摩擦强度的正断层、平移断层和逆断层地应力计算模型;分析了沁水盆地南部煤储层地应力特征,揭示了沁水盆地南部煤储层处于不同深度的2种不同应力机制中,当煤层埋藏深度小于650 m时,原岩应力表现为形成正断层应力机制;而当煤层埋藏深度大于650 m时,原岩应力可能属于形成平移断层的应力机制。

  • Abstract
    Fault frictional strength is limited condition of in-situ stress,how to evaluate it is a question worth considering in coal and CBM mining process,through the analysis of fault frictional strength and its control on the in-situ stress,the relationship between the ratio of maximum to minimum principal stress and fault frictional strength was established,then the in-situ stress calculation model was set up.Research results show that the ratio of maximum to minimum principal stress is constrained by fault frictional strength in coal seam,which comes to the ultimate of fault friction strength in critical direction,fault slip will occur.Based on the fault classification of Anderson,in-situ stress is divided into three stress states,in-situ stress calculation model of normal fault,parallel displacement fault and reverse fault considering frictional strength are established.The characteristics of in-situ stress for coal reservoirs in the Southern Qinshui Basin are analyzed.There are two different stress mechanisms in different depth of coal reservoir in the Southern Qinshui Basin,when the buried depth is less than 650 m,the original stress is in the normal fault stress mechanism;when the buried depth is more than 650 m,the original stress may be in the stress mechanism of parallel displacement fault.
  • 关键词

    断层摩擦强度地应力煤层气开采沁水盆地南部

  • KeyWords

    fault frictional strength;in-situ stress;CBM drainage;Southern Qinshui Basin

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主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会

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