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71 / 2023-06-01 19:44:28
Macro-micro mechanical behavior research on gas hydrate bearing coal based on parallel bonding model
gas hydrate bearing coal
4. Deep mine safety
摘要录用
Xia Gao / Heilongjiang university of science and tech
Nannan Wang / heilongjiang university of science and technology
To study the effects of confining pressure and saturation on the macro and meso mechanical properties of gas hydrate bearing coal (GHBC), discrete element simulation of triaxial compression test was carried out. Firstly, the numerical model of GHBC was constructed by particle flow program PFC3D. By comparing with the results of the indoor triaxial test, the detailed parameters can reflect the mechanical characteristics. On this basis, the macro and meso - mechanical characteristics were analyzed from the stress - strain curve, velocity field, contact force chain, coordination number and porosity. The results show that the discrete element simulation results agree well with the indoor test results, and can simulate the strain hardening characteristics of the sample generally well. The velocity field reveals the macroscopic change of the sample volume during compression. Dilatancy degree of the sample is higher under low saturation and shrinkage degree the sample is higher under high confining pressure. With the increase of confining pressure and saturation, the contact force increases and the number of contact force chains increases, which enhances the strength of the sample. The coordination number on the whole increases, while the porosity on the whole decreases. Finally, it is found that the friction is an important factor to maintain the stability of the micromechanical system of the sample and the coordination number increases and the porosity decreases, there is certain correspondence between the two, but not one - to - one correspondence.

 
重要日期

  • 会议日期

    08月18日

    2023

    至

    08月20日

    2023

  • 07月07日 2023

    初稿截稿日期

  • 08月20日 2023

    注册截止日期

主办单位
International Committee of Mine Safety Science and Engineering
承办单位
Heilongjiang University of Science and Technology
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