- 摘 要
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（1 南通開放大學(xué)建筑工程學(xué)院， 南通 226000； 2 南通大學(xué)交通與土木工程學(xué)院， 南通 226018；3 上海申元巖土工程有限公司， 上海 200011）
［摘要］以上海某醫(yī)院基坑工程為例，對“兩墻合一”地下連續(xù)墻基坑的支護(hù)結(jié)構(gòu)變形、內(nèi)力以及周邊建筑物沉降的現(xiàn)場實測數(shù)據(jù)進(jìn)行全面系統(tǒng)的分析，研究不同施工工況下支護(hù)結(jié)構(gòu)內(nèi)力、變形變化規(guī)律，以及基坑開挖對坑外建筑沉降的影響。結(jié)果表明，基坑開挖時地下連續(xù)墻側(cè)向位移呈拋物線形狀，最大側(cè)向位移出現(xiàn)在開挖面下方1～2m處，隨著開挖深度的增大，地下連續(xù)墻側(cè)向位移逐漸增大； 支撐內(nèi)力的發(fā)展呈迅速增大、趨于穩(wěn)定兩個階段； 基坑開挖對建筑物的沉降有較大的影響，基坑北側(cè)建筑物沉降的發(fā)展經(jīng)歷四個階段：基本穩(wěn)定、開始增大\|緩慢回彈、加速增大、趨于穩(wěn)定； 由于坑外鄰近建筑的存在，2倍基坑開挖深度范圍以外坑外地表沉降實測值與經(jīng)驗預(yù)估值基本保持一致，而在2倍基坑開挖深度范圍以內(nèi)坑外地表沉降實測值與經(jīng)驗預(yù)估值有較大偏差。
［關(guān)鍵詞］基坑開挖； “兩墻合一”地下連續(xù)墻； 沉降； 現(xiàn)場監(jiān)測
中圖分類號：TU476+.3, TU753文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2020)20-0128-05
Analysis on deformation influence and field monitoring of adjacent building induced by foundation pit excavation using “one wall acted as two” for underground diaphragm wall
ZHANG Kefeng1, WU Changjiang2, YI Li3
(1 School of Architecture Engineering, Nantong Open University, Nantong 226000, China；2 School of Transportation and Civil Engineering, Nantong University, Nantong 226019, China； 3 Shanghai Shenyuan Geotechnical Engineering Co., Ltd., Shanghai 200011, China)
Abstract:A hospital foundation pit engineering in Shanghai was taken as an example, a comprehensive systematic analysis on field measured data was conducted on the supporting structure deformation and internal force of foundation pit excavation using “one wall acted as two” for underground diaphragm wall and surrounding buildings settlement, and the internal force and deformation laws of the supporting structure under different construction conditions were studied as well as the influence of foundation pit excavation on the settlement of buildings outside the pit. The results show that the lateral displacement of the underground diaphragm wall is parabolic, and the maximum lateral displacement occurs at 1～2m below the excavation surface. With the increase of the excavation depth, the lateral displacement of the underground diaphragm wall increases gradually. The development of the supporting internal force is two stages which rapidly increases and tends to be stable. The excavation of the foundation pit has a greater impact on the settlement of the building, and the development of the settlement of the building on the north side of the foundation pit has gone through four stages: basically stable, beginning to increase and rebounding slowly, acceleration increase, and tending to be stable; due to the existence of adjacent buildings outside the pit, the measured value of the surface settlement outside the pit is basically consistent with the empirical estimate outside the range of 2 times the excavation depth of the foundation pit, while the measured value of the surface settlement outside the pit within the range of 2 times the excavation depth of the pit has a large deviation from the empirical estimate value.
Keywords:foundation pit excavation; “one wall acted as two” for underground diaphragm wall; settlement; site monitoring
*江蘇省高校自然科學(xué)基金研究面上項目（17KJD560002），江蘇省自然科學(xué)基金青年項目（BK20180954）。
作者簡介：張珂峰，碩士，副教授，Email：zhangkefeng2210@163.com； 通信作者：吳昌將，博士，高級工程師，Email：15921360161@163.com。
