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（奧雅納工程咨詢（上海）有限公司， 上海 200031）

［摘要］對(duì)于深大基坑工程，當(dāng)樁基礎(chǔ)在基坑開挖之前已經(jīng)施工完成時(shí)，在基坑開挖過程中，樁基礎(chǔ)將因土體卸荷松弛而導(dǎo)致承載力降低。另外，坑底以下土體隆起將在樁身產(chǎn)生附加拉力。從理論推導(dǎo)入手，提出一種既簡(jiǎn)便實(shí)用又能合理評(píng)估開挖卸荷對(duì)樁基基礎(chǔ)影響的簡(jiǎn)化算法，主要用于計(jì)算開挖卸荷引起的樁基礎(chǔ)承載力降低值和土體回彈引起的樁身附加拉力。并結(jié)合樁基礎(chǔ)開展參數(shù)分析，獲得了基坑開挖時(shí)樁基承載力和樁身附加拉力隨開挖深度和樁徑的變化規(guī)律，并提出幾點(diǎn)應(yīng)對(duì)建議，供工程技術(shù)人員參考。

［關(guān)鍵詞］開挖卸荷； 土體回彈； 樁基承載力損失； 樁身附加拉力

中圖分類號(hào)：TU473-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)22-0053-06

A simplified calculating method for calculating bearing capacity loss of pile foundation and additional tension force in piles caused by deep foundation pit excavation

Wang Mingmin, Sun Guangyu, Zhu Ligang, Zou Jinlin

(ARUP, Shanghai 200031, China)

Abstract:For deep and large foundation pit engineering, when pile foundation is completed before foundation pit excavation, the bearing capacity of pile foundation will reduce due to soil unloading procedure during foundation pit excavation. In addition, the soil swelling below the pit bottom will generate additional tension force in piles. Starting with theoretical derivation, a simplified calculating method was proposed which was simple, practical and could reasonably evaluate the impact of excavation unloading on pile foundation. This calculating method was mainly used to calculate the bearing capacity loss caused by excavation and the additional tension force in piles caused by soil swelling. Through parameter analysis of pile foundation, the variation law of   the bearing capacity of pile foundationa and additional tension force in pile with the excavation depth and the pile diameter  when the excavation of the foundation pit were obtained, and some suggestions for countermeasures were proposed for reference by engineers and technicians.

Keywords:unloading by excavation; soil swelling; bearing capacity loss of pile foundation; additional tension force in pile

作者簡(jiǎn)介：王明珉，博士，高級(jí)工程師，注冊(cè)土木工程師（巖土），Email:cquwmm@163.com。