长江漫滩区超深地连墙成槽土体变形研究  

Research of Soil Deformation Induced by Slurry Trenching of Ultra-deep Diaphragm Wall in Yangtze River Floodplain

作　　者：孟娟 颜庭成 陈晓飞[1] 孙彦晓 MENG Juan;YAN Tingcheng;CHEN Xiaofei;SUN Yanxiao(Jiangsu Huadong Geological Construction Group Co.,Ltd,Nanjing Jiangsu 210000 China;Institute of Geotechnical Engineering,Southeast University,Nanjing Jiangsu 211189 China)

机构地区：[1]江苏华东地质建设集团有限公司,江苏南京210000 [2]东南大学岩土工程研究所,江苏南京211189

出　　处：《江苏建筑》2024年第2期101-105,125,共6页Jiangsu Construction

基　　金：国家自然科学基金(41972269,52178384)。

摘　　要：现阶段工程设计中往往忽略成槽引起的土体变形,但当工程对环境变形较为敏感时,该部分土体变形值得受到进一步关注。文章针对长江漫滩区超深地下连续墙成槽引起的土体变形问题,依托南京江北新区地下空间一期工程,建立了超深地连墙成槽有限元模型,计算了成槽引起的地表沉降及土体侧移,分析了土体变形发展规律及槽壁加固、超载等因素的影响。结果表明,超深地连墙成槽引起的地表沉降和加固范围内的土体侧移主要发生在成槽前期,深层抓槽对浅层土体影响程度有限。地表沉降主要由超载引起,而水平位移受超载影响程度较小,影响深度约13 m。当超载为50 kPa时,槽壁加固可使最大地表沉降降低37.3%,可使加固范围内的最大土体侧移降低61.3%。Currently the soil deformations induced by slurry trenching are typically neglected in the engineering design.When the surrounding environment is sensitive,the deformations deserve further attention.Focusing on the soil deformation induced by slurry trenching of ultra-deep diaphragm wall in Yangtze River floodplain,finite element model of slurry trenching was built,based on the first-stage project of underground space in Jiangbei New Area,Nanjing.The induced ground settlement and lateral displacement of soil during slurry trenching were computed,with the development patterns of soil deformations,the effects of slurry trench reinforcement and overload analyzed.The results indicate that the ground settlement and lateral displacement of soil within the range of reinforcement mainly develop in the early stages of slurry trenching.Trenching in the relatively higher depth has limited effects on the soil in the lower depth.The overload is the main cause of the ground settlement,whereas it slightly affects the lateral displacement of soil above the depth of 13 m.When the overload is 50 kPa,the maximum ground settlement and lateral displacement of soil within the range of reinforcement can be reduced by 37.3%and 61.3%respectively under the effects of the slurry trench reinforcement.

关 键 词：地下连续墙 有限元 地表沉降 土体侧移 超载 槽壁加固 

分 类 号：TU476.3[建筑科学—结构工程]