长江科学院院报2018，Vol.35Issue(1)：123-127,5.DOI:10.11988/ckyyb.20160924
Hoek-Brown强度准则在深部岩体力学参数估算中的应用研究
Study on the Application of Hoek-Brown Strength Criterion in Estimating Mechanics Parameters of Deep Rock Mass
於汝山 1杨宜 2许冬丽1
作者信息
- 1. 长江勘测设计研究院长江岩土工程总公司(武汉),武汉430010
- 2. 长江科学院水利部岩土力学与工程重点实验室,武汉430010
- 折叠
摘要
Abstract
The estimation method of rock mechanic parameters based on Hoek-Brown strength criterion could well reflect the nonlinear failure characteristics by taking into account multiple factors such as rock structure,rock block strength,rock mass stress state,etc.With the deep marbles at Jinping project as a research case,the intactness coefficient Kv of rock mass is introduced to improving the determination of GSI (geological strength index) value of deep rock mass,and the applicability of this estimation method to deep rock mass is analyzed in detail.Results indicate that the Hoek-Brown strength criterion is feasible in estimating the mechanics parameters of deep rock mass as the four parameters in Hoek-Brown strength criterion are independent and have no correlation with confining pressure state.The intactness coefficient Kv of rock mass enhances the objectivity of determining GSI value as it reflects the discontinuities development in rock mass and the excavation disturbance.It is appropriate to calculate parameter σrci and mi according to indoor triaxial test results.The envelope curves of Jinping marbles obtained by the method are apparently nonlinear.Under high confining pressure state (15 MPa＜σ3＜40 MPa),internal friction angle of Jinping marbles decreases by 32％,while cohesion is 3 times that under low confining pressure state.关键词
深部岩体/H-B强度准则/地质强度指标/岩体完整性系数/力学参数Key words
deep rock mass/Hoek-Brown strength criterion/GSI/intactness of rock mass/mechanics parameters分类
建筑与水利引用本文复制引用
於汝山,杨宜,许冬丽..Hoek-Brown强度准则在深部岩体力学参数估算中的应用研究[J].长江科学院院报,2018,35(1):123-127,5.
