含水率对红砂岩粗粒土压实变形特征的影响

Experimental research on influence of different moisture content on static compaction deformation characteristics of red sandstone soil

为研究含水率对红砂岩粗粒土静力压实变形特征的影响,利用自制装置在电子万能试验机上进行静力压实试验,得到6种不同含水率红砂岩粗粒土压实试验的压力-位移关系,分析含水率对静力压实变形特征的影响。结果表明:红砂岩粗粒土在静力压实过程中的应力与应变符合指数关系;红砂岩粗粒土的压缩模量随对应应力范围终值的增大而增大,两者之间呈线性关系;红砂岩粗粒土的静力压实过程可分为3个阶段:压密阶段、破碎阶段和稳定阶段;在静力压实过程中,应变增长存在拐点;应变拐点的出现,标志着红砂岩粗粒土静力压实过程由压密阶段转向破碎阶段。

To research the influence of different moisture content on static compaction deformation characteristics of red sandstone soil,the static load compaction tests were conducted by using universal electronic testing machine.Compression-displacement relations of red sandstone under 6 different water contents were obtained and the effects of moisture content on static compaction deformation characteristics were analyzed.The results show that in the compaction process of red sandstone,the relationship between the stress and displacement is exponential.The compression modulus of red sandstone increases linearly with growth of corresponding stress terminal value.Three stages were found during the compaction process of coarse-grain red sandstone,namely compaction stage,broken stage and stable stage.In the process of static compaction,a turning point existed in the strain growth,indicating a transformation from compaction stage to broken stage.