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［摘要］組合支護(hù)體系由上部土釘墻和下部錨拉樁（墻）結(jié)構(gòu)聯(lián)合形成，北京城區(qū)超過(guò)15m深的基坑越來(lái)越多地采用這種支護(hù)體系。以開挖深度約22m的北京僑?；▓@廣場(chǎng)深基坑工程為例，分析了上部土釘墻在基坑開挖各階段的內(nèi)力變化規(guī)律，在開挖至土釘墻底時(shí)，土釘內(nèi)力增長(zhǎng)速率最快，當(dāng)基坑潛在滑裂面超過(guò)土釘墻末端時(shí)，進(jìn)一步的開挖對(duì)土釘內(nèi)力增長(zhǎng)影響有限；由于預(yù)應(yīng)力錨桿的存在，減小了基坑坡頂?shù)奈灰疲瑫r(shí)土釘內(nèi)力比設(shè)計(jì)值要小很多，今后類似工程設(shè)計(jì)可以減小土釘桿體直徑。
［關(guān)鍵詞］組合支護(hù)體系； 基坑； 土釘墻； 錨拉樁（墻）； 土釘內(nèi)力； 監(jiān)測(cè)
中圖分類號(hào)：TU753.1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2011)10-0105-02
Stress monitoring and analysis on upper soil nailing  of super deep foundation pit with composite retaining system
 Zhang Zhiping， Cheng Xuejun(China State Construction International Co., Beijing 100125, China)
Abstract:The composite retaining system is composed by soil nailing wall on the upper side and piles (or diaphragm walls) supported by anchor on the lower side. Nowadays, such system has been applied more and more in project excavated deeper than 15m in Beijing. Taking Qiaofu Plaza project with its excavation depth about 22m as an example, the soil nailing force on the upper side of this system was monitored and analyzed. The results show that the force grows fastest when excavated to the bottom of soil nailing wall. When the potential slide line is over the end of soil nailing wall, the force grows slowly to stable. Anchor with pre-stress reduces the horizontal displacement of the foundation pit, meanwhile, the force of soil nailing is little, so the diameter of steel bar in soil nailing wall can be reduced in similar engineering.
Keywords:composite retaining system; foundation pit;  soil nailing wall; piles(or diaphragm wall) supported by anchor; soil nailing stress; monitoring
通訊作者簡(jiǎn)介：程學(xué)軍，碩士，高級(jí)工程師，注冊(cè)巖土工程師，Email：cheng_xuejun@126.com。
參考文獻(xiàn)
［1］北京僑?；▓@廣場(chǎng)深基坑工程施工組織設(shè)計(jì)［R］. 北京：中建國(guó)際建設(shè)有限公司，2006