孔隙结构对黏土持水性及抗剪强度的影响  

Effect of pore structure on water retention and shear strength of clays

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作  者:陈芸 颜荣涛[1] 张芹[1] 陈柏莹 蔡煜 陆地 CHEN Yun;YAN Rongtao;ZHANG Qin;CHEN Baiying;CAI Yu;LU Di(School of Civil Engineering,Guilin University of Technology,Guilin,Guangxi 541004,China)

机构地区:[1]桂林理工大学土木工程学院,广西桂林541004

出  处:《中国科技论文》2024年第5期557-565,共9页China Sciencepaper

基  金:国家自然科学基金资助项目(11962004);广西自然科学基金资助项目(2017GXNSFAA198215);广西高校中青年教师科研基础能力提升项目(2023KY0221)。

摘  要:为研究双峰孔隙结构对非饱和土力学特性的影响,以广西南宁和桂林2种典型双峰孔隙结构黏土为研究对象,分析了其在不同饱和度情况下的抗剪强度特性;辅以滤纸法及核磁共振(nuclear magnetic resonance,NMR)技术探究了2种土体在双峰孔隙结构情况下孔隙水分布状态对强度的影响机理。结果表明:饱和状态下,2种土体试样的T2分布曲线为双峰结构,且土样持水特性整体上均呈现双峰土水特征曲线;2种土体的应力-位移关系变化规律相似,抗剪强度与饱和度密切相关;在饱和度为40%前后土样黏聚力变化趋势发生改变,而内摩擦角则是在饱和度为80%时达到最小值。In order to study the influence of bimodal pore structure on the mechanical properties of unsaturated soil,two typical bimodal pore structure clays in Nanning and Guilin in Guangxi were selected as target materials and the shear strength characteristics under different saturation conditions were analyzed.The effect mechanism of pore water distribution status on the strength of two kinds of soils with bimodal pore structure was explored by filter paper method and nuclear magnetic resonance(NMR)technique.The results show that the T2 distribution curves of the two samples have bimodal structure under saturated condition.Moreover,on the whole,the water retention characteristics of soil samples show bimodal soil-water characteristic curve.The stress-displacement relationship of the two kinds of soil is similar and the shear strength is closely related to saturation.The change trend of soil sample cohesion changes when the saturation is 40%,while the internal friction angle reaches the minimum at a saturation of 80%.

关 键 词:双峰孔隙结构 饱和度 抗剪强度 滤纸法 核磁共振技术 

分 类 号:TU411[建筑科学—岩土工程]

 

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