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張建新1，周嘉賓2，吳東明3（1 天津城市建設(shè)學(xué)院，天津市軟土特性與工程環(huán)境重點(diǎn)實(shí)驗(yàn)室，天津 300384；2 河南省交通科學(xué)技術(shù)研究院有限公司，鄭州 450005；3 河南煤化集團(tuán)鶴煤公司設(shè)計(jì)處，鶴壁 458000）

［摘要］基于天津站交通樞紐基坑工程2標(biāo)段施工監(jiān)測(cè)資料，對(duì)超深逆作基坑開(kāi)挖過(guò)程中地下連續(xù)墻及墻后土體水平變形、豎向位移等進(jìn)行了分析。由分析結(jié)果可知，逆作基坑地連墻水平變形隨深度變化近似呈弓形分布，在坑口處有向坑外的變形；水平變形最大值出現(xiàn)在基坑開(kāi)挖面以上約1/3深度處，與順作法發(fā)生在基底開(kāi)挖面附近有顯著不同。墻后土體的水平變形與墻體變形趨勢(shì)大致相同，但變形值要小。在豎直方向上，隨開(kāi)挖深度的增加，地連墻不斷隆起，層板澆筑后隆起值變小，最終變形趨于穩(wěn)定。通過(guò)對(duì)逆作基坑開(kāi)挖的監(jiān)測(cè)分析，得出了有別于順作基坑圍護(hù)結(jié)構(gòu)變形的規(guī)律，體現(xiàn)了逆作法變形小、整體性強(qiáng)的特點(diǎn)。

［關(guān)鍵詞］深基坑；逆作法；地下連續(xù)墻；變形；監(jiān)測(cè)分析

中圖分類號(hào)：TU753.1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2012)04-0121-03

Analysis of retaining structure deformation in super-deep foundation pit by top-down construction method

Zhang Jianxin1，Zhou Jiabin2，Wu Dongming3(1 Tianjin Institute of Urban Construction, Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin 300384, China; 2 Henan Transportation Research Institute Co., Ltd., Zhengzhou 450005, China；3 Design Department, Hebi Coal Co., Henan Coal & Chemical Group, Hebi 458000, China)

Abstract:Based on the actual measurement data of foundation in Tianjin Transfer Junction Station, the horizontal deformation and vertical displacement of the diaphragm wall and the soil behind the wall were analyzed during the pit excavation by top-down construction method. Results indicate that the horizontal deformation of the wall is similar to “bow” shaped approximately, and deformation is developed out at the wall-top. The maximum of the horizontal deformation occurs at about one third depth of the pit away from the excavation surface, which is obviously different from at bottom of the excavation by normal construction method. The deformation of the soil behind the wall is similar to the wall, except that its value is lower. The diaphragm wall uplifts continuously with the excavation depth increasing. The uplift value becomes smaller and deformation gets stabilized after laminate board pouring. The different changing discipline between top-down construction and normal construction method concluded by monitoring analysis exemplifies the trait that the top-down construction causes slight displacement and has good integrity .

Keywords:deep foundation pit; top-down construction method; diaphragm wall; deformation; monitoring analysis

*天津市科技創(chuàng)新專項(xiàng)基金（07FD2DSF01200），天津高校雙五科技計(jì)劃項(xiàng)目（SW20080010）。

作者簡(jiǎn)介：張建新，博士，教授，Email：zh_jianxin@126.com。

參考文獻(xiàn)

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