江水位及插入比对临江超大基坑变形的影响  

Influence of water level and insertion ratio on the deformation of ultra-large foundation pit adjacent to river

作　　者：徐长节[1,2] 迟民良 杨开放 薛光桥[4] 孙峰[4] 冯国辉 Xu Changjie;Chi Minliang;Yang Kaifang;Xue Guangqiao;Sun Feng;Feng Guohui(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang 330013,China;School of Engineering,Hangzhou City University,Hangzhou 310015,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,杭州310058 [2]华东交通大学江西省岩土工程基础设施安全与控制重点实验室,南昌330013 [3]浙大城市学院工程学院,杭州310015 [4]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《东南大学学报（自然科学版）》2023年第6期1189-1198,共10页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52238009);国家自然科学基金-高铁联合基金资助项目(U1934208);江西省自然科学基金-揭榜挂帅资助项目(20223BBG71018)。

摘　　要：为研究江水位变动对临江超大基坑产生的不利影响,以杭州市秦望地下综合体超大基坑工程为研究背景,基于小应变土体硬化本构模型和霍克-布朗岩石本构模型,采用数值建模软件PLAXIS建立了数值模型,通过与工程实测结果对比,验证了数值模拟的准确性.基于上述计算模型,分析了不同施工阶段基坑变形规律,研究了江水位变动、不同地连墙插入比条件下临江超大基坑变形规律.研究结果表明:地连墙插入比对地连墙侧移变形影响显著,但对坑外地表沉降影响较弱,当地连墙插入比为1.6~2.0时,可同时对二者产生较好的控制效果;随着江水位升高,地连墙侧移和地表沉降均逐渐增大,悬挂式止水帷幕条件下,江水位变动对地连墙侧移值与地表沉降值的影响更为显著.To study the adverse effects of water level changes on the ultra-large foundation pit adjacent to river,taking the ultra-large foundation pit project of the Qinwang underground complex in Hangzhou City as the research background,based on the hardening-soil model with small-strain stiffness and Hooke-Brown rock constitutive model,a numerical model was established by using numerical modeling software PLAXIS.The accuracy of the numerical simulation was verified by comparing with the engineering measurement results.Based on the model,the deformation laws of foundation pit at different construction stages were analyzed,and the deformation laws of adjacent foundation pit at different water levels and different insertion depths of diaphragm wall were studied.The results show that the insertion ratio of diaphragm wall has a great influence on the lateral movement of diaphragm wall but has little effect on the surface settlement outside the pit.Both of them can be best controlled when the insertion ratio of diaphragm wall ranges from 1.6 to 2.0.With the increase of river water level,the lateral movement of diagram wall and surface settlement increase gradually.In the case of the suspended diagram wall,the influence of river water level on the lateral movement and surface settlement of the diagram wall can be more significant.

关 键 词：临江基坑 基坑变形 数值模拟 江水位 插入比 

分 类 号：TU433[建筑科学—岩土工程]