河道淤泥气泡混合轻质土动力特性及本构模型研究  

Research on the Dynamic Characteristics and Constitutive Model of Foamed Mixture Lightweight Soil Using River Sludge

作　　者：刘增祥[1] 陆勇 娄玥玥 黄卉 LIU Zeng-xiang;LU Yong;LOU Yue-yue;HUANG Hui(Capital Construction Division,Soochow University,Suzhou 215021,Jiangsu Province,China;School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,Jiangsu Province,China)

机构地区：[1]苏州大学基本建设处,江苏苏州215021 [2]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《中国农村水利水电》2024年第1期171-179,共9页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(51378327);江苏省高等学校基础科学(自然科学)研究项目(22KJB170020)。

摘　　要：河道淤泥气泡混合轻质土(FMLSS)是一种较新颖的疏浚淤泥在工程领域废物再利用方式。利用室内动三轴试验分析了不同的围压、含水率、水泥掺入量和气泡含量条件下FMLSS动应力应变骨干曲线的变化规律。结果表明,FMLSS动应力应变骨干曲线呈现先线性增加然后逐渐趋稳的规律,符合双曲线模型;相比围压、含水率和气泡含量的影响,水泥掺入量对FMLSS动应力应变关系的影响更显著。考虑到FMLSS力学性质的复杂性,对原有Hardin-Drnevich模型进行改进,提出修正系数k及其函数表达,再由拟合曲线反推求出k值并对其变化规律进行分析,发现k值随围压、水泥掺入量和气泡含量的增加而减小,随含水率的增加而增大。根据拟合结果对k值函数中的待定系数进一步优化,最后建立起符合FMLSS动力特性的修正Hardin-Drnevich模型,为其稳定分析、灾变预测及工程应用提供支撑。Foamed mixture lightweight soil using river sludge(FMLSS)is a novel method of dredged silt reuse in the engineering field.The variation law of dynamic stress strain backbone curve of FMLSS under different confining pressures,different water contents,different ce⁃ment contents and different air foam contents is analyzed by the indoor dynamic triaxial test.The results show that the dynamic stress strain backbone curve of FMLSS presents a law of linear increase at first and then gradually stabilize,which accords with the hyperbolic model.Compared with confining pressure,water content and air foam content,the influence of cement content on dynamic stress strain relationship of FMLSS is more significant.Considering the complexity of the mechanical properties of FMLSS,the original Hardin-Drnevich model is im⁃proved,the correction coefficient k and its function expression are proposed,then the coefficient k value is derived from the fitting curve and the change rule of coefficient k value is analyzed,and it is founded that the coefficient k value decreases with the increase in confining pres⁃sure,cement content and air foam content,increases with the increase in water content.According to the fitting results,the undetermined coefficients in the k value function are further optimized,and finally a modified Hardin-Drnevich model conforming to the dynamic character⁃istics of FMLSS is established,which provides support for the stability analysis,disaster prediction and engineering application of FMLSS.

关 键 词：河道淤泥气泡混合轻质土 动荷载 动剪切模量 动剪应变 动力本构模型 

分 类 号：TU411[建筑科学—岩土工程] X141[建筑科学—土工工程]