致密砂岩抗剪参数与H-B参数间关系研究

以致密砂岩三轴测试为基础,建立Hoek-Brown(H-B)参数反算模型,应用4种基于不同假设H-B准则方法对岩石抗剪参数进行估值并修正,与Mohr-Coulomb(M-C)准则结果对比。结果表明,修正后两种准则估值结果极为接近。将该方法应用于Shirahama砂岩,评价结果与试验结果较为一致,表明基于反算法建立的H-B参数与岩体抗剪参数间定量关系可信。岩体声学参数与抗剪参数间关系的进一步探索对预测岩体破坏及采矿安全具参考价值。

Research on Relationship between Shear Strength Parameters and H-B Criterion Parameters of the Tight Sandstone

This paper is based on the triaxial test results of the tight sandstone, we created an inverse model to obtain the defining parameters in H-B criterion, using 4 other methods based on the H-B criterion to evaluate the values of sandstone’s cohesion and internal friction angle. A comparison was made with the results by conventional linear M-C criterion method, it shows that after giving a certain correction to the evaluation results, they would have a much more higher precision and application value. Finally, by applying these methods into Shirahama sandstone, the evaluation result is consistent with the real one. The results show that the method promoted in this paper is feasible. The further exploration of rock mass’s acoustic parameters and its shear parameters has a great reference value to prediction of rock damage and the safety of mining.