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Anisotropy of crack initiation strength and damage strength of coal reservoirs

         

摘要

The crack volume strain method and acoustic emission(AE)method are used to analyze the anisotropy of the crack initiation strength,damage strength,the failure mode and the AE characteristics of coal reservoir.The results show that coal reservoirs show obvious anisotropic characteristics in compressive strength,cracking initiation strength and damage strength.The compressive strength of coal reservoirs decreases with the increase of bedding angle,but the reservoirs with bedding angles of 450 and 900 differ little in compressive strength.The crack initiation strength and damage strength decrease first and then increase with the increase of bedding angle.The crack initiation strength and damage strength are the highest,at the bedding angle of 0°,moderate at the bedding angle of 90°,and lowest at the bedding angle of 45°.When the bedding angle is 0°,the failure of the coal reservoirs is mainly steady propagation of large-scale fractures.When the bedding angle is 45°,one type of failure is caused by steady propagation of small-scale fractures,and the other type of failure is due to a sudden instability of large-scale fractures.When the bedding angle is 90°,the failure is mainly demonstrated by a sudden-instability of small-scale fractures.Compared with the cumulative count method of the AE,the cumulative energy method is more suitable for determining crack initiation strength and damage strength of coal reservoirs.

著录项

  • 来源
    《石油勘探与开发》 |2021年第1期|243-255|共13页
  • 作者单位

    State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology(Beijing) Beijing 100083 China;

    Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining and Technology(Beijing) Beijing 100083 China;

    State Key Laboratory of Water Resource Protection and Utilization in Coal Mining Beijing 100083 China;

    Key Laboratory of Safety and High-efficiency Coal Mining Ministry of Education(Anhui University of Science and Technology) Huainan 232001 China;

    State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology(Beijing) Beijing 100083 China;

    Key Laboratory of Safety and High-efficiency Coal Mining Ministry of Education(Anhui University of Science and Technology) Huainan 232001 China;

    State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and Tech-nology Huainan 232001 China;

    PetroChina Research Institute of Petroleum Exploration & Development Beijing 100083 China;

    State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology(Beijing) Beijing 100083 China;

    College of Engineering Peking University Beijing 100083 China;

    CAS Key Laboratory of Mechanical Behaviour and Design of Materials University of Science and Technology of China Hefei 230026 China;

    State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology(Beijing) Beijing 100083 China;

    State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology(Beijing) Beijing 100083 China;

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