- 摘 要
-
(1 華東建筑設(shè)計研究院有限公司上海地下空間與工程設(shè)計研究院， 上海 200002；2 上海基坑工程環(huán)境安全控制工程技術(shù)研究中心， 上海 200002)
［摘要］上海國際金融中心設(shè)置5層地下室，基坑總面積為48 860m2，周長約為950m，基坑普遍區(qū)域挖深為26.5m，以此超深大基坑為工程背景，分析了軟土層中順逆作分區(qū)交叉實施的基坑變形特性。結(jié)果表明：順作區(qū)和逆作區(qū)外圍地下連續(xù)墻各測點的側(cè)向位移規(guī)律相似，最終變形形態(tài)為“紡錘形”，且變形空間效應(yīng)顯著； 逆作區(qū)受順作區(qū)開挖卸荷及時間效應(yīng)的影響，側(cè)向位移增量較大，逆作區(qū)開挖對已完成地下結(jié)構(gòu)施工的順作區(qū)影響有限，中隔墻在逆作區(qū)開挖期間墻體產(chǎn)生側(cè)向位移回復(fù)趨勢； 順、逆作區(qū)墻后地表沉降分布形態(tài)相似，均呈現(xiàn)凹槽形，且無量綱化的地表沉降曲線均位于上海地區(qū)地表沉降統(tǒng)計的包絡(luò)線范圍內(nèi)； 在順作施工而逆作區(qū)處于暫停狀態(tài)期間，逆作區(qū)地表沉降發(fā)展顯著。
［關(guān)鍵詞］上海國際金融中心； 基坑工程； 順作法； 逆作法； 圍護墻變形； 地表沉降
中圖分類號：TU753文獻標識碼：A文章編號：1002-848X(2020)18-0126-10
Field measurement and analysis on deformation behavior of extreme deep and large foundation pit engineering of Shanghai International Financial Center
WANG Weidong1,2, XU Zhonghua1,2, ZONG Ludan1,2, CHEN Yongcai1,2
（1 Shanghai Underground Space Engineering Design & Research Institute, East China Architecture Design & Research Institute Co.， Ltd., Shanghai 200002, China; 2 Shanghai Engineering Research Center of Safety Control for Facilities Adjacent to Deep Excavations, Shanghai 200002, China）
Abstract:The Shanghai International Finance Center has five basements. The total area of the foundation pit is 48 860m2, the circumference is about 950m, and the general area of the foundation pit is 26.5m deep. Taking the extreme deep and large foundation pit as the engineering background, the deformation characteristics of foundation pit constructed by top-down and down-top method in soft soil were analyzed. The results show that the lateral deformation rules of the underground continuous retaining wall at the periphery of the bottom-up construction area and top-down construction area are similar, and the final deformation form is “spindle”, and the deformation space effect is significant. The lateral deformation increment is large in the top-down construction area which is affected by the excavation unloading and the time effect of the bottom-up construction area. The excavation of the top-down construction area has limited impact on the bottom-up construction area of the completed underground structure construction. The middle partition wall has a trend of lateral deformation recovery during the period of excavation in the top-down construction area. The distribution of surface settlement behind the wall in the bottom-up construction and top-down construction areas is similar, showing a groove shape, and the non-dimensional surface settlement curves are within the envelope of the surface settlement statistics in the Shanghai area. During the period of bottom-up construction when the top-down construction is suspended, the surface settlement of the top-down construction area has developed significantly.
Keywords:Shanghai International Financial Center; foundation pit engineering; bottom-up construction method; top-down construction method; retaining wall deformation; ground settlement
*上海市科學(xué)技術(shù)委員會科研計劃項目子課題（13231201006）。
作者簡介：王衛(wèi)東，博士，教授級高級工程師，一級注冊結(jié)構(gòu)工程師，Email：weidong_wang@arcplus.com.cn； 通信作者：宗露丹，碩士，工程師，Email: ludan_z@arcplus.com.cn。
