基于Drucker-Prager准则的含瓦斯水合物煤体强度准则研究
Study on strength criterion of gas hydrate-coal mixture based on Drucker - Prager criterion
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摘要: 为获得含瓦斯水合物煤体在高饱和度下强度准则的适用性，基于Drucker-Prager准则，结合高饱和度含瓦斯水合物煤体常规三轴压缩下的应力-应变曲线，探讨Drucker-Prager准则下其理论值与试验值的误差，分析Drucker-Prager准则的适用性，同时与Mohr-Coulomb准则进行对比。结果表明：含瓦斯水合物煤体的峰值强度在高饱和度和围压耦合作用下，其值随着围压和饱和度的增加而增加；Mohr-Coulomb准则与Drucker-Prager准则的强度预测绝对误差最大值分别为6.77%和3.66%，说明试验结果与预测模型的吻合度较高；然而Drucker-Prager准则强度预测绝对误差均在0.92%～3.66%，其误差波动范围较小，说明Drucker-Prager准则在高饱和度下更为适用。
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关键词:
- 含瓦斯水合物煤体 /
- 煤与瓦斯突出 /
- Drucker-Prager准则 /
- Mohr-Coulomb准则 /
- 煤体强度
Abstract: In order to obtain the applicability of the strength criterion of gas hydrate coal under high saturation, based on Drucker-Prager criterion and combined with the stress-strain curve of gas hydrate coal under conventional triaxial compression, the error between the theoretical value and the experimental value under Drucker-Prager criterion was discussed. The applicability of Drucker-Prager criterion was analyzed and compared with Mohr-Coulomb criterion. The results show that the peak strength of gas hydrate coal increases with the increase of confining pressure and saturation under the coupling effect of high saturation and confining pressure. The maximum absolute errors of strength prediction by Mohr-Coulomb criterion and Drucker-Prager criterion were 6.77% and 3.66%, respectively, indicating that the test results were in good agreement with the prediction model. However, the absolute errors of intensity prediction of Drucker-Prager criterion are in the range of 0.92%-3.66%, and the range of error fluctuation is small, indicating that Drucker-Prager criterion is more suitable for high saturation. -
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