Hoek-Brown准则奇异屈服面的圆化方法及其强度折减技术与应用.docVIP

基于非参数统计的Hoek-Brown准则的参数敏感性分析 尤 涛1，戴自航1 (1.福州大学 土木工程学院，福建 福州 350108) 摘 要：Hoek-Brown强度准则能正确反映岩体强度，描述岩体非线性破坏特征，目前作为岩体强度准则影响最为深远、应用最广泛，但其参数获取存在人为因素，数据离散，不利于理论分析和数值计算。基于此，在对不规则Hoek-Brown屈服面处理并数值实现的基础上，提出用非参数统计方法研究Hoek-Brown参数敏感度，用Matlab实现拉丁抽样，借助一巷道模型，研究了参数对其围岩变形的敏感性，得到各参数的敏感度大小顺序，说明围岩塑性区和弹性区的变形受控因素不同，围岩塑性区的变形与GSI值的相关性最大。 作者简介：尤涛，男，1992年生，硕士研究生，建筑与土木工程专业，岩土与地下工程方向，主要从事岩石力学方面的研究，E-mail: fzutyou@126.com。 通讯作者：戴自航，男，博士，教授，博士生导师，岩土工程专业，长期从事岩土与地质工程方面的研究工作，E-mail: dzhang@。 关键词：Hoek-Brown准则；非参数统计；围岩变形；参数敏感性；GIS值 中图分类号：TU452 文献标识码：A Parameter Sensitivity Analysis of Hoek-Brown Criterion Based on Nonparametric Statistics YOU Tao1, DAI Zi-hang1 (1. School of Civil Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China) Abstract: The Hoek-Brown strength criterion can be adjusted to provide an estimate of the decreased strength of the rock mass and reflect the intrinsic nonlinear strength criterion of rock and rock-mass failure characteristics, which up to now is a criterion with the most significant influence and the broadest application. But for estimating material parameters, there are subjective factors and data discretization, which are not conducive to the theoretical analysis and numerical calculation. As a result, on the basis of yield surface treatment on irregular Hoek-Brown and numerical realization, this paper proposed using nonparametric statistical method to study Hoek-Brown parameters sensitivity. Latin sampling was applied with the aid of Matlab software. The sensitivity of parameters to the deformation of surrounding rock was studied by tanking a tunnel as an example. The order of the sensitivity of parameters was deduced as well. The study illustrated the controlled factors to the deformation of surrounding rock were different for plastic zone and elastic region, and the correlation of the deformation to the GSI value was higher for plastic zone. Key words: Hoek-Brown criterion; nonparametric statistics; surrounding rock deformation; parameter sensitiv