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(1 中冶成都勘察研究總院有限公司, 成都 610023; 2 西南交通大學(xué)土木工程學(xué)院, 成都 610031;3 四川能投節(jié)能環(huán)保投資有限公司, 成都 610023)

摘要: 以上海地區(qū)采用順作法施工開(kāi)挖深度為 20. 8m 的建筑基坑為研究對(duì)象,對(duì)五個(gè)施工階段的地下連續(xù)墻側(cè)向和豎向位移,立柱豎向位移和混凝土支撐軸力進(jìn)行監(jiān)測(cè),以圍護(hù)結(jié)構(gòu)的側(cè)向變形隨深度、位置和施工階段的差異分析基坑變形呈現(xiàn)的空間效應(yīng)與深度效應(yīng),以立柱和地下連續(xù)墻的豎向變形規(guī)律分析基坑回彈特征,以混凝土軸力隨時(shí)間變化規(guī)律分析支撐在各施工階段的關(guān)鍵作用. 分析結(jié)果表明:地下連續(xù)墻在遠(yuǎn)離坑角位置比靠近坑角位置側(cè)向位移更大,最大側(cè)移范圍為開(kāi)挖深度的 0. 12% ~ 0. 41%,其側(cè)向位移沿深度呈現(xiàn)“肚脹”形曲線,最大側(cè)向位移發(fā)生在開(kāi)挖深度以上 4m 到以下 2m 范圍內(nèi);地下連續(xù)墻和立柱豎向位移主要以隆起為主,地下連續(xù)墻最大隆起位移為 9. 14mm,立柱最大隆起位移為地下連續(xù)墻的 4 倍;混凝土支撐對(duì)于下一階段開(kāi)挖起著關(guān)鍵作用,但對(duì)更深處土層開(kāi)挖影響較小,混凝土支撐軸力最大值與地下連續(xù)墻的側(cè)向位移密切相關(guān).

關(guān)鍵詞: 基坑開(kāi)挖; 地下連續(xù)墻; 立柱; 側(cè)向變形; 隆起和沉降; 施工監(jiān)測(cè); 空間效應(yīng); 深度效應(yīng)

中圖分類(lèi)號(hào):TU753 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002?848X(2022)16?0116?09

DOI: 10. 19701 / j. jzjg. LS210165

Displacement and stress analysis of a Shanghai foundation pit at excavation stages

REN Dongxing1, HUANG Hai1, SHAO Kang2, LIU Huanhuan3, LUO Donglin1, XUE Peng1

(1 Chengdu Surveying Geotechnical Research Institute Co. , Ltd. of MCC, Chengdu 610023, China;2 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 3 Sichuan EnergySaving and Environmental Protection Investment Co. , Ltd. , Chengdu 610023, China)

Abstract: Taking a foundation pit with the construction excavation depth of 20. 8m in Shanghai as the research object, thelateral and vertical displacement of the underground diaphragm wall, the vertical displacement of the stand column and theaxial force of the concrete support in the five construction stages were monitored. The spatial effect and depth effect of thefoundation pit deformation were analyzed by the lateral deformation of the enclosure structure with the difference of depth,location and construction stage, and the springing back characteristics of the foundation pit were analyzed by the verticaldeformation law of the stand column and the underground diaphragm wall. The key role of support in each construction stagewas analyzed based on the law of force variation with time. The analysis results show that the lateral displacement of theunderground diaphragm wall is larger at the position far from the pit corner than near the pit corner, and the maximumlateral displacement range is 0. 12% ~ 0. 41% of the excavation depth; its lateral displacement presents a bulging curvealong the depth, and the maximum lateral displacement occurs in the range of 4m above the excavation depth to 2m below;the vertical displacement of the underground diaphragm wall and stand column is mainly uplift, the maximum upliftdisplacement of the underground diaphragm wall is 9. 14mm, and the maximum uplift displacement of the stand column is 4times that of the underground diaphragm wall; concrete support plays a key role in the next stage of excavation, but haslittle effect on the excavation of deeper soil layers, and the maximum axial force of concrete support is closely related to thelateral displacement of the underground diaphragm wall.

Keywords: foundation pit excavation; underground diaphragm wall; stand column; lateral deformation; uplift andsettlement; construction monitoring; spatial effect; depth effect

∗國(guó)家自然科學(xué)基金(51808458).

第一作者:任東興,碩士,高級(jí)工程師,主要從事巖土工程勘察設(shè)計(jì)、施工及研究工作,Email: rendx07@ 126. com.

[引用本文] 任東興,黃海,邵康,等. 上海地區(qū)某基坑開(kāi)挖階段的位移與受力分析[ J]. 建筑結(jié)構(gòu),2022,52(16):116?124. REN Dongxing,HUANG Hai,SHAO Kang,et al. Displacement and stress analysis of a Shanghai foundation pit atexcavation stages[J]. Building Structure,2022,52(16):116?124.