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鄰近地鐵深大基坑開(kāi)挖變形與控制措施研究
俞 強(qiáng)
摘 要

(福建省建筑設(shè)計(jì)研究院有限公司, 福州 350001)

摘要: 以鄰近運(yùn)營(yíng)地鐵隧道的福州正祥廣場(chǎng)深大基坑為實(shí)例,結(jié)合基坑開(kāi)挖過(guò)程中圍護(hù)結(jié)構(gòu)側(cè)向位移、周圍土體沉降和地鐵隧道水平及豎直位移的現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù),系統(tǒng)分析了不同施工階段基坑圍護(hù)結(jié)構(gòu)、周邊土體以及地鐵隧道的變形特性,討論了采用圍護(hù)結(jié)構(gòu)剛度優(yōu)化、支撐體系優(yōu)化以及開(kāi)挖工序優(yōu)化等變形控制措施的合理性。 結(jié)果表明:基坑淤泥層開(kāi)挖所引發(fā)的側(cè)向位移約占總側(cè)向位移的 50% ~ 60%;受開(kāi)挖方式和支護(hù)方式的影響,基坑?xùn)|側(cè)(鄰近地鐵隧道)與西側(cè)圍護(hù)結(jié)構(gòu)的最大側(cè)移位移平均值分別為 0?? 128%H 和 0?? 228%H(H 為基坑開(kāi)挖深度),最大側(cè)向位移所在深度約為 0?? 25H~H;地鐵隧道的位移曲線與基坑周圍土層、圍護(hù)結(jié)構(gòu)的位移曲線的發(fā)展趨勢(shì)具有良好的一致性,均表現(xiàn)出顯著的空間效應(yīng)。

關(guān)鍵詞: 深大基坑; 基坑開(kāi)挖; 運(yùn)營(yíng)地鐵隧道; 變形特性; 控制措施; 空間效應(yīng)

中圖分類號(hào):TU735,TV551?? 4+2 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002?848X(2022)12?0127?07

 

DOI:10. 19701 / j. jzjg. 20210667

 

Study on deformation characteristics and control measures of deep and largefoundation pit excavation neighboring metro

YU Qiang

(Fujian Provincial Institute of Architectural Design and Research Co., Ltd., Fuzhou 350001, China)

Abstract: Taking the deep and large foundation pit of Fuzhou Zhengxiang Square adjacent to the operating subway tunnel as an example, combined with the on?site measured data of the lateral displacement of the enclosure structure, the surrounding soil settlement and the horizontal and vertical displacement of the subway tunnel during the excavation process of the foundation pit, a systematic analysis was carried out on the deformation characteristics of the foundation pit envelope,surrounding soil and subway tunnels in different construction stages, and the rationality of the deformation control measures such as the optimization of the envelope structure stiffness, the optimization of the support system and the optimization of the excavation process were discussed. The results show that the lateral displacement caused by the excavation of the silt layer of the foundation pit accounts for about 50% ~ 60% of the total lateral displacement. The average maximum lateral displacement of the side enclosure structure is 0?? 128%H and 0?? 228%H respectively, which influenced by the excavation method and support method. (H is the excavation depth of the foundation pit), and the depth of the maximum lateral displacement is about 0?? 25H~H. The displacement curve of the subway tunnel has a good consistency with the development trend of the displacement curve of the soil layer around the foundation pit and the envelope structure, and both show significant spatial effects.

Keywords:deep and large foundation pit; foundation pit excavation; operating subway tunnel; deformation characteristic;control measure; spatial effect

∗福建省科技計(jì)劃引導(dǎo)性項(xiàng)目(2021H0032)。
第一作者:俞強(qiáng),學(xué)士,教授級(jí)高級(jí)工程師,注冊(cè)巖土工程師,主要從事巖土工程相關(guān)工作,Email:yu_qiang1967@ 126.com。
 
[引用本文] 俞強(qiáng). 鄰近地鐵深大基坑開(kāi)挖變形與控制措施研究[J]. 建筑結(jié)構(gòu),2022,52(12):127?133. YU Qiang.Study on deformation characteristics and control measures of deep and large foundation pit excavation neighboring metro[J].Building Structure,2022,52(12):127?133.
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