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浅埋近距离上覆遗留煤柱应力集中灾害压裂治理技术研究

Research on fracturing treatment technology of concentrated stress disaster by the overlying coal pillar in close distance shallow seam

  • 摘要: 针对浅埋近距离上覆遗留煤柱造成的动力灾害问题,基于“垮落填充体+上覆煤柱”支撑理念,结合定向长钻孔精准成孔技术,提出了顶板分段压裂超前弱化治理技术。综合采用理论分析、技术开发、工程实践等方法,研究了顶板分段压裂超前弱化治理机理,并在典型矿井开展了工程应用。结果表明:分段压裂施工过程最高注水压力为21.20 MPa,最大破裂压降为7.60 MPa,出现3.00 MPa以上压力降50余次;压裂后顶板来压步距、动载系数、最高压力较未压裂段分别降低了13.58%、13.77%、25.49%,验证了压裂技术的有效性。该治理技术可有效控制由上覆遗留煤柱引起的动力灾害。

     

    Abstract: In view of the problem that the dynamic disaster caused by the overlying coal pillar in close distance shallow seam, based on the supporting concept of "caving fillings+overlying coal pillar", the technology of advanced weakening and treatment of roof staged fracturing was put forward combined with the technology of directional long borehole precise hole formation. Combined with the theoretical analysis, technology development, engineering practice and other methods,the principle of advanced weakening and treatment of roof stage fracturing was explored, and the engineering application was carried out in typical mine. The results show that in the stage fracturing construction process, the maximum injection pressure is 21.20 MPa, the maximum fracture pressure drop is 7.60 MPa, the pressure drop above 3.00 MPa occurres more than 50 times; compared with the unfractured sections, the periodic pressure step, dynamic load coefficient and maximum pressure are reduced by 13.58%, 13.77% and 25.49% respectively after fracturing, the effectiveness of fracturing technology is verified. The treatment technology can effectively control the dynamic disaster caused by overlying coal pillars.

     

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