节理岩体强度参数损伤张量模型多维估算

Multi-dimensional Estimation of Strength Parameters of Jointed Rock Based on Damage Tensor Model

Hoek-Brown强度准则因可较好实现对节理岩体稳定性分析及参数估算,正逐渐被广泛应用于岩体工程评价中。在对其进行力学参数估算时,采用一维损伤因子D将岩体视为各向同性损伤材料进行分析,而实际上,节理岩体损伤呈现为多维度特征,对其整体损伤效应予以准确把握有赖于建立多维度损伤表示方法。本文基于Hoek-Brown强度准则实现对岩体强度参数估算,充分考虑损伤效应的多维度特征,建立损伤张量表示模型,并结合节理裂隙空间分布参数,实现对损伤张量因子确定化表示;基于节理岩体损伤张量表示结果,结合某露天铜矿边坡节理岩体统计窗测试结果,实现了对强度参数系统估算。损伤张量模型具有表示节理岩体空间损伤特征,可较好用于对节理岩体强度参数的多维度估算。

Hoek-Brown strength criterion can be widely applied to the evaluation of rock mass engineering because of its good stability analysis and parameter estimation. During the estimation of mechanics parameters,the rock mass was commonly considered to be an isotropic damage material by expressed a one-dimensional damage factor D. In fact, the damage of jointed rock mass presented a multi-dimensional characteristic, and the accurate understanding of its damage effect depended on the establishment of multi-dimensional damage representation method.The strength parameters of the rock mass was estimated based on the Hoek-Brown strength criterion,and the damage tensor representation model was established considering the multi-dimensional characteristics of damage effect. Based on the results of damage tensor of jointed rock mass,a statistical window test results of joint rock mass of an opencast copper mine slope was carried out detailed,and then the strength parameter system estimation was realized. Overall,the damage tensor model has the characteristics of space damage in jointed rock mass and should be suggested to estimate the strength parameters of jointed rock mass.