摘要
为了研究红粘土的地域性特征及红粘土抗剪强度的水敏性,以广梧高速云浮段红粘土为试样,进行一系列基础试验,并绕过量测基质吸力,采用考虑不同含水率的变化研究其抗剪强度水敏性。试验结果表明,该红粘土具有高含水率、高液限、高塑性、缩胀性、裂隙性、高孔隙比、低压缩性和"假粉性"等特点;红粘土应力-应变曲线为强化型曲线,高含水率和低含水率的抗剪强度相差较大,抗剪强度随着含水率的增加而减小,其中粘聚力随含水率的增加,呈一阶指数衰减,内摩擦角随含水率的增加呈现分段函数的特征;通过水敏性试验的结果提出了"临界含水率抗剪强度面"的概念,在已知上覆压力和干湿状态的情况下可以通过一套识别流程判别土体是否达到抗剪强度,可为实际工程应用提供参考依据。
To research the regional characteristic and the water-sensitive shear strength of red clay,a series experiments which were based on the sample of the red clay located in the Guangdong Yunfu region were done,and the rule of the water-sensitive shear strength was discovered by considering the change of moisture content directly without measuring the matric suction.The results showed that the red clay has high moisture content,high liquid limit,high plasticity,contraction dilation,fracture property,high porosity ratio,low compression,and＂pseudo-powder＂.Red clay stress-strain curve is the enhanced curve,and there is a large difference between high and low moisture content at shear strength.The shear strength increases with the decrease of moisture content.Cohesion increases with the increase in moisture content,showing a first-order exponential decay,while internal friction angle showing the characteristics of sub-functions.The concept of＂shear strength surface on critical moisture content＂was put forward through the water sensitivity test results,and it can be determined that whether the soil reaches the shear strength through a recognition process based on known overlying pressure and wet-dry state of the clay,and this can provide a reference for practical engineering.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2011年第1期17-22,共6页
Journal of Sichuan University (Engineering Science Edition)
基金
广东省交通厅科技项目(2009-03-005)
关键词
红粘土
工程特性
抗剪强度
水敏性
red clay
engineering properties
shear strength
water sensitivity
