海陆交互相软土固结抗剪强度指标变化规律研究  

Research on the Variation of Shear Strength Index of Marine-continental Facies Soft Soil after Consolidation

作　　者：刘红军[1] 何程铃 陈锋 周志军[1] 杨超 LIU Hongjun;HE Chengling;CHEN Feng;ZHOU Zhijun;YANG Chao(School of Civil Engineering and Architecture,Wuyi University,Jiangmen 529020,China)

机构地区：[1]五邑大学土木建筑学院,广东江门529020

出　　处：《森林工程》2024年第4期218-224,共7页Forest Engineering

基　　金：国家自然科学基金青年项目(41702323);广东省普通高校特色创新项目(2020KTSCX152);江门市基础与理论科学研究类科技计划项目(2020JC01023)。

摘　　要：以珠三角地区海陆交互相淤泥质软土为研究对象,通过室内直剪试验探究不同固结压力和固结度下抗剪强度及抗剪强度指标的变化规律,提出抗剪强度及对应指标-固结度-固结压力三维Logistic数学模型。研究结果表明,当固结压力P≥200 kPa、固结度U≥40%时,软土黏聚力(c)和内摩擦角(φ)增长较为明显;当U=100%时,各级固结压力作用下的软土抗剪强度(τ)相较于初始状态分别提高了7.89、12.73、13.50、18.20、22.38 kPa;所给出的三维数学模型可直接计算出某一固结压力和固结度下的抗剪强度指标c、φ、τ。研究成果能够更为准确地评价该地区软土地基逐级加载过程中的整体稳定性。Taking the marine-continental facies soft silty soil in the Pearl River Delta region as the research object,the changing rules of shear strength and shear strength indexes under different consolidation pressures and degrees of consolidation were investigated through indoor straight shear tests,and a three-dimensional logistic mathematical model of shear strength and corresponding indexes-degree of consolidation-consolidation pressure was proposed.The results showed that:when P≥200 kPa,U≥40%,the growth of soft soil cohesion(c)and internal friction angle(φ)was more obvious;when U=100%,campared to the initial state,the soft soil shear strength(τ)under the action of all levels of consolidation pressure increased by 7.89,12.73,13.50,18.20,22.38 kPa,respectively;the given three-dimensional mathematical model can directly calculate the shear strength index and shear strength under a certain consolidation pressure and consolidation degree;the research results can more accurately evaluate the overall stability of the soft soil foundation in this area during the step-by-step loading process.

关 键 词：海陆交互相软土 分级加载 抗剪强度指标 固结度 固结压力 

分 类 号：TU411.7[建筑科学—岩土工程]