摘要
【目的】为了研究不同黏粒含量及不同含水比对红黏土强度特性的影响,【方法】以桂林市红黏土为研究对象,根据净水沉降原理从所取红黏土中提取黏粒,以制备不同黏粒掺量的红黏土试样,进行固结不排水三轴试验,对不同黏粒含量及不同含水比红黏土强度指标、应力-应变关系进行分析。【结果】结果显示:随着黏粒掺量的增加,红黏土的黏聚力从30.57~37.71 kPa增加至43.36~59.66 kPa,而内摩擦角从18.0°~22.0°减少至14.5°~15.5°;随着含水比的增加,红黏土的黏聚力从37.71~59.66 kPa减少至30.57~43.36 kPa,而内摩擦角从14.5°~18.0°增加至15.5°~22.0°。【结论】结果表明:黏粒含量和含水比对红黏土的黏聚力和内摩擦角的影响明显,随着黏粒的不断添加,黏聚力会不断上升,内摩擦角会不断减小,但随着含水比的增大,黏聚力呈线性减小,内摩擦角呈线性增加,黏粒含量较含水比对黏聚力和内摩擦角的影响更为显著;黏粒含量和含水比对红黏土应力-应变关系曲线的影响基本属于硬化型,黏粒含量越大,硬化性越好,含水比越大,土体的主应力差越小,但土体的硬化性保存不变。可见,红黏土的抗剪强度指标受黏粒含量和含水比的影响明显。
[Objective]In order to study the influence of different clay content and different water content ratio on the strength characteristics of red clay.[Methods]Taking Guilin red clay as the research object,clay was extracted from the red clay according to the principle of water settlement to prepare red clay samples with different clay content,and the consolidated undrained triaxial test was carried out.The strength index and stress-strain relationship of red clay with different clay content and different water content ratio are analyzed.[Results]The test result show:With the addition of clay content,the cohesion of red clay increases from 30.57~37.71 kPa to 43.36~59.66 kPa,while the internal friction angle decreases from 18.0°~22.0°to 14.5°~15.5°.[Conclusion]The result show that the clay and water content ratio have a significant effect on the cohesion and internal friction angle of red clay.With the continuous addition of clay particles,the cohesion will continue to increase,and the internal friction angle will continue to decrease.However,as the water content increases,the cohesion decreases linearly and the internal friction angle increases linearly.The effect of clay content on cohesion and internal friction angle is more significant than that of water content.The stress-strain relation curve of clay content and water content ratio to red clay basically belongs to the hardening type.The larger the clay content,the better the hardening property.The larger the water content ratio,the smaller the principal stress difference of the soil,but the hardening property of the soil remains unchanged.It can be seen that the shear strength index of red clay is significantly affected by the clay content and water content ratio.
作者
刘宝臣
周浩风
杨柏
王小波
赵珊珊
王良玉
LIU Baochen;ZHOU Haofeng;YANG Bai;WANG Xiaobo;ZHAO Shanshan;WANG Liangyu(School of Architecture and Transportation Engineering,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China;School of Civil and Architectural Engineering,Guangxi University of Science and Technology,Liuzhou 545006,Guangxi,China;College of Construction Engineering,Jilin University,Changchun 130026,Jilin,China)
出处
《水利水电技术（中英文）》
北大核心
2024年第7期147-156,共10页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(42067044)
广西科技基地和人才专项(桂科AD20238063,桂科AD21220051)。
关键词
红黏土
黏粒含量
含水比
三轴模型试验
强度特性
影响因素
red clay
clay content
water content ratio
triaxial model tests
strength characteristics
influence factor
作者简介
刘宝臣(1968-),男,教授,博士,主要从事岩土工程教学、科研及原位测试研究。E-mail:bc0608@163.com;通信作者:杨柏(1989-),男,讲师,博士,研究方向为地基基础工程。E-mail:ayangbai@163.com。
