岩土力学2023，Vol.44Issue(12)：3541-3550,10.DOI:10.16285/j.rsm.2023.0538
基于Hoek-Brown准则的层理岩石强度模型研究
Strength model of anisotropic rocks based on Hoek-Brown criterion
摘要
Abstract
In order to improve the applicability of Hoek-Brown failure criterion and reduce subjectivity in the determination of geological strength index(GSI)value for anisotropic rocks,a modified Hoek-Brown failure criterion is proposed,which considers the variation of the GSI value with the bedding angle of anisotropic rocks.Triaxial compression test data of anisotropic rocks with different bedding angles were first collected.The results show that the peak strength of anisotropic rocks exhibits a U-shaped relation with bedding angle β.Then,the rock specimen with the bedding angle β=0° is defined as the intact rock.The uniaxial compressive strength σc and material parameter mi of intact rocks are obtained from data fitting using Hoek-Brown failure criterion.The corresponding GSI values under different bedding angles are calculated.The relationship between GSI and bedding angle β is fitted using Gaussian function,and a new strength model of anisotropic rocks is established based on Hoek-Brown failure criterion.Finally,the proposed model is verified by comparing the peak strength obtained from the GSI-softening model.It is found that the modified Hoek-Brown failure criterion is suitable for predicting the strength of anisotropic rocks with different bedding angles and under various confining pressure.The physical meaning of the new parameters in the model is also discussed.关键词
层理岩石/层面倾角/Hoek-Brown准则/GSI-强度模型Key words
anisotropic rock/bedding angle/Hoek-Brown failure criterion/GSI-strength model分类
建筑与水利引用本文复制引用
李国枭,王航龙,彭俊,王林飞,代碧波..基于Hoek-Brown准则的层理岩石强度模型研究[J].岩土力学,2023,44(12):3541-3550,10.基金项目
国家重点研发计划青年科学家项目(No.2022YFC2905700) （No.2022YFC2905700）
国家自然科学基金重点项目(No.52130403) （No.52130403）
安徽省自然科学基金(No.2208085ME120) （No.2208085ME120）
安徽省重点研发计划(No.2022m07020001).This work was supported by the National Key Research and Development Plan for Young Scientists(2022YFC2905700),the Key Project of National Natural Science Foundation of China(52130403),the Natural Science Foundation of Anhui Province(2208085ME120)and the Key Research and Development Plan of Anhui Province(2022m07020001). （No.2022m07020001）
