水泥加固黏土强度及应力-应变全曲线特征研究  

Research on the Properties of Strength and Stress-Strain Curve of Cement Clay

作　　者：张文涛 程新俊 梁海安[1] 胡光阳[1] 许翔 程雅芳 ZHANG Wentao;CHENG Xinjun;LIANG Haian;HU Guangyang;XU Xiang;CHENG Yafang(School of Civil and Architectural Engineering,East China University of Technology,Nanchang 330013,Jiangxi,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

出　　处：《水力发电》2023年第1期100-105,共6页Water Power

基　　金：国家自然科学基金资助项目(52008081,51808259);中国地震局地震工程与工程振动重点实验室开放研究专项(2020D24)。

摘　　要：以南昌地区典型粉质黏土为研究对象,通过正交试验和极差分析,探究水泥掺量、土样含水率和养护龄期对水泥土强度的影响,分析不同配比水泥土的破坏模式。结果表明,水泥掺量由2%增至8%时,水泥土分别为塑性破坏和双剪压破坏,水泥掺量超过11%时,水泥土呈明显的脆性破坏;水泥加固黏土时存在界限含水率,试样含水率高于界限含水率时,明显弱化水泥掺量对水泥土的抗压强度及应力-应变曲线的影响。根据水泥土应力-应变曲线的演变特征,提出水泥土的单轴应力-应变全曲线方程,通过理论值与试验结果对比,验证了其可靠性。Taking the typical silty clay in Nanchang area as research object, the orthogonal experiments and extreme difference analysis are used to explore the effects of cement dosage, soil moisture content and conservation age on cement soil strength. The results indicate that,(a) when the cement content increased from 2% to 8%, the failure of cement clay samples are plastic failure and double shear failure respectively, while when the cement content exceeded 11%, the obviously brittle failure of the sample is appeared;and(b) there is a boundary water content in the soil sample, and when the water content of the sample is higher than the boundary water content, it could obviously weaken the influence of cement content on the compressive strength and stress-strain curve of cement soil. According to the evolution characteristics of the stress-strain curve of cement soil, the uniaxial stress-strain full curve equation of cement-soil is proposed, and its reliability is verified by comparing the theoretical values with the test results.

关 键 词：水泥土 单轴抗压强度 应力-应变全曲线 水泥掺量 含水率 养护龄期 本构模型 

分 类 号：TU411[建筑科学—岩土工程]