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为研究应变率对砾石土应力、应变、强度特性的影响和应变率效应产生机制,对砾石和黏土混合备制的饱和砾石土心墙料,在应变率0.028～0.690%/min范围内进行了不同围压下的固结不排水三轴压缩试验,定量地分析了三轴不排水抗剪强度的应变率效应。试验结果表明,不同的应变率下砾石土应力-应变曲线具有相似性;应变率增大10倍,不排水抗剪强度增大7.4%～29.9%;砾石土的应变率效应是剪切产生的孔隙水压力和土料本身黏滞性共同作用的结果,在不同的围压下二者发挥的程度不同。
In order to study the effect of strain rate on the stress, strain and strength characteristics of gravel soil and the mechanism of strain rate effect, the gravel and clay prepared core material of saturated gravel soil was used in the strain rate range of 0.028-0.690% / min Under undrained triaxial compression tests under different confining pressures, the strain rate effect of undrained triaxial shear strength was quantitatively analyzed. The test results show that the stress-strain curves of gravel soil are similar under different strain rates. The strain rate increases 10 times and the undrained shear strength increases 7.4% -29.9%. The strain rate effect of gravel soil is shear The effect of pore water pressure and soil material viscosity is different, under different confining pressures.