花岗岩残积砂质黏性土的物理力学特性研究

Study on the Physical and Mechanical Properties of Sandy Clayey Soil with Granite Residues

以泉州市工商旅游职业中专学校花岗岩残积砂质黏性土为研究对象,运用室内三轴剪切试验的方法,研究试验在固结排水、固结不排水状态下的应力应变、体应变和超孔隙水压力变化特征。结果表明应力应变曲线呈轻微的应力软化特征;三轴固结不排水剪切时,超孔隙水压力呈现短暂线性增加,后非线性增加,达到峰值后呈现稳定非线性减小的趋势;花岗岩残积砂质黏土的有效应力路径变化规律大致相同,均逐步趋近于临界状态线,且剪切围压越小,趋近速率越大。

Taking the granite residual sandy cohesive soil of Quanzhou Industrial and Commercial Tourism Vocational Secondary School as the research object,the characteristics of stress strain,bulk strain and excess pore water pressure in the consolidated drainage and consolidation non-drainage conditions were studied by using the method of indoor triaxial shear test.The results show that the stress-strain curve shows a slight stress softening characteristic.During the triaxial consolidation of undrained shear,the excess pore water pressure increases briefly and increases nonlinearly,and then decreases steadily and nonlinearly after reaching the peak.The effective stress path of granite residual sandy clay is about the same,and all of them gradually approach the critical state line,and the smaller the shear confining pressure,the greater the approach rate.