含水率对杂填土与软土互嵌致沉的影响研究  

Mutual Embedding Settlement Between Miscellaneous Fill and Soft Soil Influenced by Moisture Content

作　　者：张福海[1,2,3] 薛浩宇 刘峥嵘 王远航 徐嘉成 ZHANG Fuhai;XUE Haoyu;LIU Zhengrong;WANG Yuanhang;XU Jiacheng(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;Research Institute of Geotechnical Engineering,Hohai University,Nanjing 210098,China;Engineering Research Center of Dredging Technology,Ministry of Education,Hohai University,Changzhou 213022,Jiangsu China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学江苏省岩土工程技术工程研究中心,南京210098 [3]河海大学疏浚技术教育部工程研究中心,江苏常州213022

出　　处：《河南科学》2023年第2期199-206,共8页Henan Science

基　　金：国家自然科学基金资助项目(51778211);江苏省自然科学基金资助项目(BK20171434)。

摘　　要：上覆荷载作用下,杂填土地基下敷含水率高的淤泥软土会轻易挤入杂填土的孔隙中从而造成互嵌沉降,该部分沉降在传统地基沉降计算中未被考虑.以杂填土地基下敷的淤泥软土为研究对象,以液性指数为指标,选取六种不同含水率下的淤泥软土,利用自制的互嵌装置进行室内试验,揭示了杂填土与软土在含水率变化下的总沉降与互嵌沉降发展规律.试验结果表明:互嵌沉降与总沉降具有类似的发展规律,即加载初期发展较快,随着加载时间的增加,最后逐渐趋于稳定;当软土含水率变化时,互嵌沉降随着含水率的增大而增大,互嵌沉降占总沉降的比重也随着含水率的增大而增大;在液性指数IL≤1.0、IL≥1.25时,互嵌沉降与软土含水率呈线性正相关关系,且两者随含水率的增加呈相似的速率进行增长.The silty soft soil with high moisture content underneath the miscellaneous fill can easily squeeze into the pores of the miscellaneous fill under overlying loads,and resulting in mutual embedding settlement,which is not taken into account in traditional foundation settlement calculations. The research took the silty soft soil laid under the miscellaneous fill foundation as object,and the liquidity index as indicator,selected six kinds of silt soft soil with different moisture content,used self-made embedded instrument to investigate the development law of total settlement and mutual embedded settlement under the variation of moisture content by tests. The results indicate that mutual embedding settlement has similar development laws to total settlement,that is,the initial development of loading is relatively fast,but in the end,it gradually tends to stabilize with the increase of loading time. When the moisture content of soft soil changes,mutual embedded settlement increases with the increase of moisture content,and the proportion of mutual embedded settlement accounting for total sedimentation also increases with the increase of moisture content. When IL≤1.0 or IL≥1.25,the relationship between mutual embedded settlement and soft soil moisture content is linearly positively correlated,and both curves increase at similar rates with the increase of moisture content.

关 键 词：杂填土 淤泥软土 互嵌沉降 含水率 液性指数 

分 类 号：TU447[建筑科学—岩土工程]