基于Hoek-Brown准则的岩体力学参数确定方法

阐述了岩体力学参数研究的重要性,系统地介绍了Hoek-Brown强度准则确定岩体力学参数的原理及其方法。以湖北宜巴高速公路上的彭家湾软硬岩互层边坡岩体力学参数研究为例,并以试验得出的岩块物理力学参数、岩体完整性系数和波速为基础,采用Hoek-Brown强度准则对场区岩块物理力学参数进行工程折减弱化处理,其结果对比分析及其推荐值的工程应用结果表明:线性回归分析法和非线性拟合法求取岩体抗剪强度参数是合理的;数值模拟计算所得的结果与场区边坡岩体实际变形破坏特征基本一致。其成果能为其他类似工程求取岩体力学参数提供指导。

Methods of Obtaining Mechanics Parameters of Rock Mass Based on Hoek-Brown Criterion

Having elaborated the importance of study on rock mechanics parameters, we introduced the principles and methods of determining rock mechanics parameters by Hoek-Brown criterion. The mechanical parameters of soft-hard interbedded rock slope at Pengjiawan of Yichang-Badong expressway are taken as research example. On the basis of physico-mechanical parameters, rock integrity factor and wave velocity obtained from laboratory test, we reduced the physico-mechanical parameters by Hoek-Brown criterion. Comparative analysis on the results suggest that the shear strength parameters determined by linear regression analysis and non-linear fitting method are both logical; the numerical simulation result is consistent with the deformation and failure characteristics of actual rock. The results provide guidance for the determining of rock mechanics parameters in other similar projects.