杂填土中角砾含量对其力学性质影响的试验研究  

Experimental study on the mechanical properties of miscellaneous fill with different gravel content

作　　者：陈雷[1,2] 陈宇 刘峥嵘[3,4] 安彦勇 李治朋 CHEN Lei;CHEN Yu;LIU Zheng-rong;AN Yan-yong;LI Zhi-peng(Tianjin Research Institute for Water Transport Engineering,M.O.T.,Tianjin 300456,China;Tianjin Survey and Design Institute for Water Transport Engineering Co.Ltd.,Tianjin 300456,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;Research Institute of Geotechnical Engineering,Hohai University,Nanjing 210024,China)

机构地区：[1]交通运输部天津水运工程科学研究所,天津300456 [2]天津水运工程勘察设计院有限公司,天津300456 [3]河海大学岩土力学与堤坝工程教育部重点实验室,南京210024 [4]河海大学岩土工程科学研究所,南京210024

出　　处：《水道港口》2023年第1期112-117,共6页Journal of Waterway and Harbor

基　　金：国家自然科学基金资助项目(51778211)。

摘　　要：以南京吉山矿区堆放场的杂填土为研究对象,采用中型三轴仪,研究杂填土中角砾含量对其力学性质的影响。试验结果表明:相同围压下,随着角砾含量的增加,试样剪切破坏时的主应力差逐渐增加,相同角砾含量下,随着围压的增加,试样剪切破坏时的主应力差逐渐变大。不同角砾含量下的混合土试样的强度指标为线性,服从莫尔-库伦强度准则,试样粘聚力和内摩擦角与角砾含量关系曲线可用线性函数拟合。在相同围压作用下,随着角砾含量的增加,填土试样的泊松比有小幅度波动,在相同角砾含量,随着围压的增大,试样的泊松比总体上呈减小趋势。相关研究成果可为杂填土地基处理及资源化利用提供理论指导。The miscellaneous fill in the dumping yard of Jishan mining area in Nanjing was took as the research object,and a medium-sized triaxial instrument was used to study the influence of the gravel stone content in miscellaneous fill on its mechanical properties.The test results show that:under the same confining pressure,with the increase of the gravel stone content,the principal stress difference of the sample at shear failure is increased gradually;under the same gravel stone content,with the increase of confining pressure,the principal stress difference of the sample during shear failure is increased gradually.The strength index of the miscellaneous fill samples with different gravel stone contents is linear and obeys the Mohr-Coulomb strength criterion.The relationship between the sample cohesion and the internal friction angle and the gravel stone content can be fitted by linear function.Under the same confining pressure,with the increase of gravel stone content,the Poisson′s ratio of the fill sample is fluctuated slightly.At the same gravel stone content,with the increase of the confining pressure,the Poisson′s ratio of the sample is generally decreased trend.The relevant research results can provide theoretical guidance for the treatment and resource utilization of miscellaneous landfills.

关 键 词：填土 角砾含量 应力-应变-强度特性 试验研究 

分 类 号：U616[交通运输工程—船舶及航道工程]