基于相对结构度的水泥固化压实土力学与变形特性研究  

Study of mechanical and deformation characteristics of cement-solidified compacted soil based on relative structure degree

作　　者：李吴刚 李想 杨钢[2] 孙秀丽 刘文化 邵伯 LI Wugang;LI Xiang;YANG Gang;SUN Xiuli;LIU Wenhua;SHAO Bo(School of Mechanical Engineering,Jiangnan University,Wuxi 214122,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;China Construction Bureau No.2 Construction Engineering Co.LTD,Shenzhen 518000,China)

机构地区：[1]江南大学机械工程学院,江苏无锡214122 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [3]中建二局第二建筑工程有限公司,广东深圳518000

出　　处：《大连理工大学学报》2024年第1期64-73,共10页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(52009049)。

摘　　要：由于胶结作用和孔隙结构的影响,结构性土的力学与变形特性显著区别于重塑土.为了解结构性土的特性,采用人工制备水泥固化压实土,并通过固结试验和固结排水剪切试验对其相对结构度及其衰变规律展开研究.详细分析了胶结作用和初始孔隙比对水泥固化压实土压缩特性与剪切特性的影响,并根据压缩试验结果建立了适用于水泥固化压实土的相对结构度发展式,最后采用所提出的相对结构度发展式对水泥固化压实土的剪切特性进行分析.研究结果表明,相对结构度的衰变速率随着水泥掺量的增大而减小,但初始孔隙比并不影响水泥固化压实土变形过程中相对结构度随塑性体应变的衰变速率;水泥固化压实土的峰值应力与相对结构度有关,并随着相对结构度的降低而减小.The mechanical and deformation characteristics of structural soil are significantly different from those of remolded soil,which is mainly reflected in cementation and pore structure.To understand the characteristics of structural soil,the relative structure degree and its decay law are studied by the consolidation test and the consolidation drainage shear test through artificially manufactured cement-solidified compacted soil.The influences of cementation and initial porosity ratio on the compression and shear properties of the cement-solidified compacted soil are analyzed in detail.According to the results of the compression test,the relative structure degree development formula suitable for the cement-solidified compacted soil is proposed.Finally,the proposed relative structure degree development formula is used to analyze the shear properties of the cement-solidified compacted soil.The results show that the decay rate of the relative structure degree decreases with the increase of cement content,but the initial porosity ratio does not affect the decay rate of the relative structure degree with plastic bulk strain during the deformation of the cement-solidified compacted soil.The peak stress of the cement-solidified compacted soil is related to the relative structure degree and decreases with the decrease of the relative structure degree.

关 键 词：结构性土 水泥固化压实土 压缩曲线 应力应变与体应变曲线 衰变规律 相对结构度 

分 类 号：TU43[建筑科学—岩土工程]