干湿作用对边坡土体强度特性影响研究  

Study on Influence of Drying and Wetting of Strength Characteristics of Slope Soil

作　　者：姚廷涛 YAO Ting-tao(Shenzhen Guanghuiyuan Water Conservancy Construction Engineering Co.Ltd.,Shenzhen 518020,Guangdong,China)

机构地区：[1]深圳市广汇源水利建筑工程有限公司,广东深圳518020

出　　处：《水利科技与经济》2025年第2期62-66,共5页Water Conservancy Science and Technology and Economy

摘　　要：为了研究不同类型的干湿循环作用对土体物理力学特性的影响,基于室内土工试验,分析两种干湿循环对土体粒径、密度及抗剪强度指标等参数的影响。结果表明:①在干湿循环作用下,土体砂粒和黏粒含量增加,土体密度减小,且干湿作用下土体液限下降幅度大于塑限。②试样峰值抗剪强度、单轴抗压强度及土体的内聚力下降,而峰值强度对应的位移和内摩擦角增大;两种干湿作用下,内聚力减小9.3%和8.1%,内摩擦角显著增大25.1%和20.3%。③干湿作用导致土体孔隙率增大,颗粒均匀性变好,磨圆度变差。此外,降雨前后气温巨大差异性导致土体力学性质劣化,影响边坡稳定性。In order to study the effects of different dry-wet cycles on the physical and mechanical properties of soils,based on indoor geotechnical tests,the effects of two dry-wet cycles on soil particle size,density and shear strength index are analyzed.The results show that:①under the action of wetting-drying cycle,the content of sand and clay increases,the density of soil decreases,and the decrease of liquid limit of soil is greater than plastic limit.②the peak shear strength,uniaxial compressive strength and cohesion of soil decrease,while the displacement and internal friction angle corresponding to the peak strength increase.The cohesion decreased by 9.3%and 8.1%,and the internal friction angle increased by 25.1%and 20.3%,respectively.③dry-wet action lead to an increase in soil porosity,the uniformity of the particles has improved,the roundness has deteriorated.In addition,the large difference of temperature before and after rainfall leads to the deterioration of soil mechanical properties and affects the slope stability.

关 键 词：边坡工程 干湿循环 力学特性 土工试验 

分 类 号：TU473[建筑科学—结构工程]