基于声波信息预测岩体力学参数的研究

Prediction of mechanical parameters of rock mass based on sound wave information

基于Hoek-Brown强度准则中运用地质强度指标GSI求取岩体力学参数的方法。通过改进构建起钻孔声波测试所得岩体纵波波速vmp,岩石单轴饱和抗压强度σc与GSI值之间的函数关系,并应用于Hoek-Brown强度准则预测了沙坨水电站大坝坝基岩体力学参数,结果显示预测值与实验测试值之间基本吻合。该方法为资料不足情况下探知岩体力学参数提供了一种参考方式。

In this study,we developed a method to calculate the mechanical parameters of rock mass using geological strength index（ GSI） based on Hoek-Brown strength criterion. We established the functional relation among the longitudinal wave velocity of the rock mass（ vmp）,the saturated uni-axial compression strength of the rock mass（ σc）and the GSI value. Then such functional relation was applied to Hoek-Brown strength criterion to predict the mechanical parameters of rock mass of the dam foundation of Shatuo hydropower station. The results showed that the predicted value basically match the test value. This method provides a reference for detecting the mechanical parameters of rock mass without enough information.