基于水作用下红黏土的承载力试验研究  

Experimental Study on the Bearing Capacity of Red Clay under Water Action

作　　者：陈道松 吴丽艳 崔玮 CHEN Daosong;WU Liyan;CUI Wei(Guangxi Hua'an Construction Engineering Quality Testing Co.Ltd.,Nanning 530001;Guangxi Hualan Geotechnical Engineering Co.Ltd.,Nanning 530001)

机构地区：[1]广西华安建设工程质量检测有限公司,南宁530021 [2]广西华蓝岩土工程有限公司,南宁530001

出　　处：《土工基础》2024年第3期547-551,共5页Soil Engineering and Foundation

摘　　要：以广西崇左地区红黏土为研究对象,开展水作用下承载力特性相关试验研究,结果表明:红黏土土体中水分蒸发迁移后,土体表面及土体产生裂隙,表面上的裂隙呈环状不规则形态,断面上的裂隙呈上宽下窄的形态。在遇水后,水沿裂隙渗入土体中,裂隙面土体崩解,裂隙中充满水,致使土体软化,承载力降低。对天然含水率状态及浸泡10 h状态下的红黏土,采用轻型动力触探和载荷试验研究其承载力的变化,发现以动力触探试验击数推定的承载力与载荷试验确定的承载力降低幅度基本一致。施工工程中如遇基槽遇水,可采用轻型动力触探试验判定其软化程度,对实际工程有很好参考价值。This paper presents the study results on the red clay in Chongzuo area.The results show that after the evaporation and the migration of water in the red clay soil samples,cracks appear on the surface of the soil and inside the soil mass.The cracks on the surface are in a circular and irregular shape,and the cracks on the cross-section are in a wide upper and a narrow lower shape.After encountering the water,the water seeps into the soil along the cracks,causing the soil on the crack surface to collapse and fill the cracks with the water,resulting in soil softening and reducing the bearing capacity,which affects the normal use of the building structures.By studying the changes in the bearing capacity of the red clay samples under the natural moisture content and the soaking for 1o hours using the lightweight dynamic penetration testing and the plate load tests,it was found that the estimated bearing capacity based on the number of dynamic penetration tests is basically consistent with the re-duction in the bearing capacity determined by the plates load tests.If the foundation excavation encounters the water during the construction,a light dynamic penetration test can be used to determine its degree of softening and to guide the construction,which has good reference value for the practical engineering.

关 键 词：红黏土 承载力 裂隙 轻型动力触探 载荷试验 水作用 

分 类 号：TU413[建筑科学—岩土工程]