三轴条件下改进的Hoek-Brown准则的修正

发布时间：2018-04-28 04:11

本文选题：改进的HB准则 + 强度准则修正　；参考：《煤炭学报》2017年05期

【摘要】：改进的Hoek-Brown准则可以降低高围压下HB准则过高预测岩石三轴强度的偏差值。然而,该准则在实际应用中仍然存在局限:通过应用大量岩石三轴试验数据验证了该准则中岩石临界状态围压等于单轴抗压强度这个观点并不具有普适性,并得出该准则在围压高于岩石单轴抗压强度时对其预测的三轴强度与试验强度存在较大的偏差,而且该偏差随着围压的增大而增加。为克服改进的HB准则这个应用局限,通过应用岩石临界状态及岩石临界状态系数对该准则进行修正,提出了I-HB准则。应用大量岩石三轴试验数据对I-HB准则的适用性进行验证,结果显示该准则有效地解决了改进的HB准则的应用局限,并且该准则预测的岩石三轴强度与岩石试验强度更一致,证明I-HB准则优越于改进的HB准则。另外,通过与目前岩石力学界认为较好的指数型准则的比较,验证了I-HB准则对岩石三轴强度的预测具有更高的精度。
[Abstract]:The improved Hoek-Brown criterion can reduce the deviation value of high HB criterion in predicting the triaxial strength of rock under high confining pressure. However, there are still some limitations in the practical application of the criterion: the conclusion that the critical state confining pressure of rock is equal to uniaxial compressive strength in this criterion is verified by the application of a large number of triaxial rock test data. It is concluded that there is a large deviation between the predicted triaxial strength and the test strength when the confining pressure is higher than the uniaxial compressive strength of rock, and the deviation increases with the increase of confining pressure. In order to overcome the limitation of the improved HB criterion, the I-HB criterion is proposed by applying the rock critical state and the rock critical state coefficient. The applicability of the I-HB criterion is verified by a large number of rock triaxial test data. The results show that the improved HB criterion can effectively solve the application limitations of the improved HB criterion, and the predicted triaxial strength of rock is more consistent with the rock test strength. It is proved that the I-HB criterion is superior to the improved HB criterion. In addition, the I-HB criterion is proved to be more accurate in predicting the triaxial strength of rock by comparing with the exponential criterion which is considered to be better in rock mechanics at present.
【作者单位】：西南科技大学环境与资源学院;武汉科技大学资源与环境工程学院;
【基金】：国家自然科学基金资助项目(51074115) 四川省教育厅科研资助项目(16CZ0013) 西南科技大学博士研究基金资助项目(15zx7134)
【分类号】：TU458

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