安山岩应力应变曲线水饱和度依存特性及强度预测方法

Water Saturation Dependence Behavior of Mechanical Properties of Andesite and a Strength Prediction Method

本研究探究了水饱和度对安山岩岩石强度和应力-应变曲线的影响。结果显示,水饱和度对卸载曲线斜率没有影响;提出了一种应力-应变曲线转换方法,用于预测不同水饱和度下的应力-应变曲线;在0<水饱和度≤100的范围内,指数函数能很好地描述水饱和度和强度之间的关系;建立了一种可预测不同水饱和度下单轴抗压强度的方法,预测值均方根误差(RMSE)为1.61,预测精度高。该研究成果为现场工程中不同水饱和度围岩的强度预测、支护设计和施工提供了新的方法。

This study investigated the impact of water saturation on the stress-strain curve and rock strength of andesite.The findings demonstrate that water saturation has little influence on the unloading curve's slope;a method for predicting the stress-strain curve under different water saturation is proposed;The relationship between water saturation and strength can be well described by an exponential function in the range of 0 to 100 water saturation.A method for predicting the uniaxial compressive strength under different water saturation is established.The prediction accuracy is high and the Root-mean-square deviation(RMSE)of the forecast value is 1.61.This study offers a novel technique for on-site engineering strength prediction,support design,and building in surrounding rocks with different water saturations.