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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。
In order to study the influence degree of immersion time on the shear strength of sand-shale granule mixture, the influence of immersion time on the shear stress, shear strength and dilatancy effect of sand-shale granule mixture was analyzed by direct shear test. The results show that the shearing process of sand-shale granule mixture after soaking can be divided into elastic stage and steady destruction stage. The cohesive force of sand-shale granule mixture shows a trend of “increasing-falling-basically stable” with immersion time , The internal friction angle of the mixture did not change much during the whole shearing process. The longer the immersion time, the smaller the dilatancy of the sand-shale granule mixture and the more obvious the shrinkage phenomenon. The results provide a reference for the construction of wading project with sand-shale granule mixture as building filler.