- 摘 要
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（上海市政工程設計研究總院（集團）有限公司, 上海 200092）
［摘要］以面積達12.2萬m2超大深基坑為工程背景，結合順作、逆作和中心島法的特點，提出了整體順逆結合設計方法，詳細介紹了其設計方案和施工工序，并著重討論了該設計方法的關鍵技術措施，包括地下兩層板代支撐、預留土坡、豎向支承系統(tǒng)。通過有限元數(shù)值模擬，對樓板剛度取值和洞口加固進行了分析，并與監(jiān)測結果進行了對比。結果表明，該設計方法在降低工程造價和施工風險的同時，保護了周邊環(huán)境，節(jié)約了一定工期，具有較好的經濟效益和社會效益，為軟土地區(qū)超大規(guī)模深基坑設計與施工提供了借鑒。
［關鍵詞］超大深基坑； 順逆結合法； 樓板代撐； 樓板大開洞； 軟土地區(qū)； 一柱一樁
中圖分類號：TU318文獻標識碼：A文章編號：1002-848X(2020)21-0121-05
Application of internal method combined bottom-up and top-down in super\|large deep foundation pit engineering in soft soil area
KONG Weiyao
（Shanghai Municipal Engineering Design Institute(Group) Co., Ltd., Shanghai 200092, China）
Abstract:Based on a super-large deep foundation pit engineering with an area of 122 000m2, the internal method combined bottom-up and top-down was put forward, combining the characteristics of bottomup, top-down and central part method. The design scheme and construction procedure of this method were introduced. The key technical measures were also focused, including underground two-story floor support, reserved soil slope and vertical support system. Through the finite element numerical simulation, the value of the slab stiffness and the reinforcement of the entrance were analyzed, and numerical simulation results and monitoring results were compared. The results show that this design method will not only reduce project cost and construction risk, but also protect surrounding environment and save a certain period of project time. On the account of the better economic and social benefits, this method can provide a reference for the design and construction of super-large deep foundation pit in soft soil area.
Keywords:super-large deep foundation pit ; method combined bottom-up and top-down; floor support; floor with large hole; soft soil area; single column over single pile
作者簡介：孔維耀，碩士，工程師，Email:kongweiyao@smedi.com。
