南昌重塑红黏土强度特性试验研究  

Experimental Study on Strength Characteristics of Remolded Red Clay in Nanchang

作　　者：谢荣 扈胜霞 李勇 林森 张涵超 XIE Rong;HU Shengxia;LI Yong;LIN Sen;ZHANG Hanchao(School of Civil and Architectural Engineering,East China University of Technology,Nanchang 330013,Jiangxi,China;CRRC Intelligent Transportation Engineering Technology Co.,Ltd.,Beijing 100078,China)

机构地区：[1]东华理工大学土木与建筑工程学院,江西南昌330013 [2]中车智能交通工程技术有限公司,北京100078

出　　处：《水力发电》2025年第3期119-124,共6页Water Power

基　　金：东华理工大学博士科研启动基金项目(DHBK2019-239)。

摘　　要：为研究南昌重塑红黏土的抗剪强度特性,开展了控制不同含水率、干密度及干湿循环次数的室内直剪试验,对南昌重塑红黏土的强度变化规律及强度参数影响因素进行研究,并推导了黏聚力与干密度之间的函数关系。结果表明:随着含水率的上升,重塑红黏土的抗剪强度和强度参数呈现下降趋势,其中黏聚力受含水率的影响更为显著,而对内摩擦角的影响相对较小;重塑红黏土的干密度越大,抗剪强度随法向应力而提高的梯度越大;建立的红黏土黏聚力与干密度之间的函数关系,可用于分析土体黏聚力随干密度的变化规律;重塑红黏土的抗剪强度在干湿循环作用下呈现指数衰减规律,前3次干湿循环衰减显著,之后衰减速度减缓并趋于稳定。In order to study the shear strength characteristics of remolded red clay in Nanchang,the laboratory direct shear tests are carried out with controlling different water content,dry density and dry wet cycle times to study the variation of strength and the influencing factors of strength parameters of remodeled red clay in Nanchang,and the functional relationship between cohesion and dry density is derived.The results show that,(a)with the increase of water content,the shear strength and strength parameters of remolded red clay show a decreasing trend,and the influence of water content on cohesion is more significant,while the influence of internal friction angle is relatively smaller;(b)the higher the dry density of remolded red clay,the greater the gradient of shear strength increase with normal stress,and the derived functional relationship between cohesion and dry density of red clay can be used to analyze the variation of soil cohesion with dry density;and(c)the remolded red clay demonstrates an exponential reduction in shear strength as a consequence of dry and wet cycles,and the shear strength reduce significantly within the first three cycles,and then the degradation speed slowed down and tended to be stable.

关 键 词：重塑红黏土 室内直剪试验 抗剪强度 含水率 干密度 干湿循环 

分 类 号：TU446[建筑科学—岩土工程]