广义H-B准则中经验参数的改进取值方法  

Improved Method for Determining the Empirical Parameters in Generalized Hoek-Brown Empirical Strength Criterion

作　　者：袁文军[1] 阮怀宁[1] 孔不凡[1] 陈振振[1] 

机构地区：[1]河海大学岩土工程科学研究所,江苏南京210098

出　　处：《人民黄河》2013年第4期98-100,共3页Yellow River

基　　金：国家重点基础研究发展规划项目(2011CB013504);国家自然科学基金资助项目(41272329)

摘　　要：介绍了国内外几种岩体力学参数的确定方法,指出了广义Hoek-Brown强度准则和有关改进公式的不足,基于扰动参数D评估值的离散性,引入完整性系数Kv来表征岩体扰动程度,利用对数函数建立了扰动参数D与完整性系数Kv的关系,从而建立修正系数Km、Ks与完整性系数Kv之间的非线性关系,同时又考虑了Km—Kv、Ks—Kv曲线斜率的渐变性质,给出了改进的广义Hoek-Brown公式。以贵州瓮福磷矿岩体力学参数研究为例,分别用提出的改进公式和其他几种方法进行计算,结果表明:所提出的改进公式在确定扰动和未扰动之间的岩体力学参数时与实际更接近。The shortcomings of generalized Hock-Brown empirical strength criterion and its modified expressions are also pointed out. Based on the assessed of the perturbation parameter D discrete, the paper introduced to characterize the rock mass integrality coefficient Kv extent of the disturb- ances, through utilizing logarithmic function to embody the relations between the integrality coefficient Kv and the perturbation parameter D, and embody the nonlinear relations between Km ,Ks and Kv , while taking into account Km - Kv and KS - Kv curves of the slope gradient properties, giv- ing an modified generalized Hock-Brown expression. The calculation was carried out through the modified expressions and other methods respective- ly by taking the study on mechanical parameters of rock mass of Guizhon Wengfulin Mine as an example. The results show that the modified expres- sion in this paper is more suitable to determine the mechanical parameters of rock mass between disturbed and undisturbed.

关 键 词：广义Hoek-Brown经验强度准则 岩体力学参数 经验参数 改进公式 

分 类 号：TV541[水利工程—水利水电工程] TU452[建筑科学—岩土工程]