基于岩体波速的Hoek-Brown模型GSI指标确定方法

Determination of GSI index in Hoek-Brown model based on rock wave velocity

常规的Hoek-Brown模型中地质强度指标GSI采用野外判别方法确定,但该方法受工程师经验影响较大。本文利用岩体波速、GSI与模量的关系,提出了一种采用岩体波速确定Hoek-Brown模型中GSI指标的定量计算方法,并提出了综合施工扰动影响的广义GSI指标。通过与常规方法对比,以及对长沙某项目的岩基载荷试验预测,验证了本文方法的可行性,对Hoek-Brown模型在工程中的广泛应用具有重要意义。

The geological strength index(GSI)for the conventional Hoek-Brown model is normally determined by field work,which is greatly affected by the experience of the engineers.Based on the relationship between wave velocity,GSI index and modulus,a quantitative method to calculate GSI index in the Hoek-Brown model is presented by using the wave velocity.The generalized GSI index with respect to the construction disturbance is also proposed in this paper.By the comparison with the normal methods,the proposed method shows the good performance.The prediction of the bearing capacity of slate rock in the Changsha project verifies the proposed method.The proposed method is meaningful for using Hoek-Brown model in engineering practice.