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(1 南通大學(xué)交通與土木工程學(xué)院， 南通 226019；2 中建三局第二建設(shè)工程有限責(zé)任公司浙江建筑設(shè)計(jì)院， 杭州 310003；3 上海申元巖土工程有限公司， 上海 200011)

［摘要］ 結(jié)合上海長興科技廠房基坑工程，采用數(shù)值計(jì)算和現(xiàn)場(chǎng)實(shí)測(cè)的方法，對(duì)基坑開挖引起陽角區(qū)域的變形性狀以及坑外鄰近建筑樁基的影響進(jìn)行了深入研究?，F(xiàn)場(chǎng)實(shí)測(cè)結(jié)果表明，基坑開挖時(shí)圍護(hù)樁側(cè)向變形均呈“鼓肚子”拋物線形狀，由于基坑開挖存在空間效應(yīng)，基坑側(cè)壁中部以及陽角區(qū)域的變形大于其他區(qū)域；陽角處坑外建筑樁基沉降經(jīng)歷了普遍發(fā)展—加速增大、緩慢回彈—繼續(xù)增大、緩慢回彈—趨于穩(wěn)定這四個(gè)階段。數(shù)值計(jì)算結(jié)果表明，坑陽角處與側(cè)壁中部的測(cè)斜位移明顯大于坑陰角處，坑陽角處及側(cè)壁中部的測(cè)點(diǎn)測(cè)斜位移呈現(xiàn)“鼓肚子”的形狀，陰角處的測(cè)斜位移基本呈直線狀；坑外樁基距離基坑開挖面越近，其水平位移越大；處于坑陽角區(qū)域的樁基受影響程度明顯大于坑陰角區(qū)域，且樁基的變形性狀也不盡相同?，F(xiàn)場(chǎng)實(shí)測(cè)與數(shù)值計(jì)算結(jié)果所反映的規(guī)律較一致。 

［關(guān)鍵詞］基坑開挖；坑角效應(yīng)；樁基；變形性狀；數(shù)值模擬；現(xiàn)場(chǎng)實(shí)測(cè) 

中圖分類號(hào)：TU473 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)18-0138-06

Analysis on deformation behavior at the positive angle region of deep foundation pit and influence of excavation on pile foundation outside the pit  

WU  Changjiang1,  ZHOU  Lei2,  YI  Li3,  CHEN  Meng3,  YU  Jun1,  LIU  Ziqiu1 

(1 School of Transportation and Civil Engineering, Nantong University, Nantong 226019， China；2 Zhejiang Architectural Design Institute of the Second Construction Co., Ltd. of China Construction Third Engineering Bureau, Hangzhou 310003，China；3 Shanghai Shenyuan Geotechnical Engineering Co., Ltd., Shanghai 200011， China) 

Abstract: Based on the foundation pit of Shanghai Changxing Technology Factory Project, the method of combining numerical calculation and field measurement was used to conduct in-depth research on the deformation behavior at the positive angle region induced by excavation of foundation pit and its influence on adjacent pile foundation of building outside the pit. The field monitoring results show that the lateral deformation of the retaining piles during the excavation of the foundation pit is the parabolic shape of "bulging belly"，the deformation of the middle sidewall and positive angle region of the foundation pit are larger than that of other region due to the spatial effect of the excavation of the foundation pit. The settlement of pile foundation of building outside the pit at positive angle region can be divided into four stages four stages of general development—accelerating increase, slowly rebounding—continuous increase, slowly rebounding—becoming stable. Numerical calculation results show that the inclinometer displacement at the middle sidewall and positive angle region of pit is obviously larger than that at negative angle region of pit, and the inclinometer displacement of the measuring point at the middle sidewall and positive angle region of pit presents the shape of "bulging belly", while the inclinometer lateral displacement behaves linearly at negative angle region of pit. The closer the pile foundation outside the pit are to the excavation surface of foundation pit, the larger its horizontal displacement is. The pile foundation at positive angle region of pit is affected significantly more than that of pile foundation at negative angle region of pit, and deformation behavior of pile foundation is also different. Laws reflected by field monitoring and numerical calculation results are the same basically.

Keywords:excavation of foundation pit； corner effect of pit； pile foundation； deformation behavior；numerical simulation； field monitoring

*江蘇省高校自然科學(xué)基金研究面上項(xiàng)目（17KJD560002），江蘇省自然科學(xué)基金青年項(xiàng)目（BK20180954），江蘇省高等學(xué)校大學(xué)生創(chuàng)新創(chuàng)業(yè)訓(xùn)練省級(jí)重點(diǎn)項(xiàng)目（202010304034）。

 作者簡介：吳昌將，博士，高級(jí)工程師，Email：15921360161@163.com。