浸水时间对砂泥岩颗粒混合料抗剪强度的影响

Influence of Soaked Time on Shear Strength of Sandstone-mudstone Particle Mixture

为研究浸水时间对砂泥岩颗粒混合料抗剪强度的影响程度,通过直剪试验分析了浸水时间对砂泥岩颗粒混合料的剪应力、抗剪强度及剪胀效应的影响。结果表明,砂泥岩颗粒混合料浸水后剪切过程大致分为弹性阶段和稳定破坏阶段;砂泥岩颗粒混合料的粘聚力随浸水时间呈现"增大—回落—基本稳定"的变化趋势,混合料的内摩擦角在整个剪切过程中变化不大;浸水时间越长,砂泥岩颗粒混合料的剪胀性越小,减缩现象越明显。研究结果为以砂泥岩颗粒混合料为建筑填料的涉水工程建设提供了参考依据。

To study the influence of soaked time on shear strength of sandstone-mudstone particle mixture,the direct shear test was used to study the impact on shear stress,shear strength and shear contraction of a sandstone-mudstone particle mixture by soaked time.The results show that the shear failure process of the sandstone-mudstone particle mixture after soaked can be divided into elastic stage and stable damage stage;the cohesion of the sandstone-mudstone particle mixture shows a trend of＂increase-decline-stable＂with the soaking time increasing.While the trend of internal friction angle has no obvious change in the whole process;the shear contraction of the sandstone-mudstone particle mixture is smaller and its shear dilatation is more obvious.The research results can provide the reference for wading engineering construction with filling sandstone-mudstone particle mixture.