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孟 瑜 ,張玉彬 ,金 蕾 ,嚴鵬華
(南京醫(yī)科大學(xué)第一附屬醫(yī)院 ,南京 210029)
摘 要 :為研究復(fù)雜條件下基坑開挖過程中基坑變形規(guī)律及周邊環(huán)境影響 ,以江蘇省南京市某醫(yī)院深基坑為工程背景 ,采用數(shù)值模擬基坑全過程開挖 ,對基坑周圍地表及地下管線、建筑物變形規(guī)律進行分析 ,并運用現(xiàn)場實測結(jié)果對數(shù)值模擬結(jié)果進行檢驗。結(jié)果表明:基坑開挖后 ,基坑外圍地表沉降形成不對稱沉降槽 ,坑底出現(xiàn)底鼓 ,坑底及鄰近裸露表面呈典型 “山 ” 字形變形輪廓;地表最大沉降位于距坑壁約 12. 1 m 處 ,最大下沉量達30. 05 mm;側(cè)向位移曲線呈 “弓形”,表現(xiàn)為 “兩端小、中段大”,峰值隨開挖加深向下遷移 ,最大水平位移位于距坑壁約 5 m 處 ,中部最大水平位移量為 6. 24 mm , 兩端小于 3 mm , 距壁面 20 m 處土體側(cè)向位移小于1 mm , 遠離坑壁建筑物沉降與隨距離增加呈現(xiàn)出衰減特征 ,基于監(jiān)測結(jié)果擬合得到地表影響半徑與開挖深度的經(jīng)驗公式。基于地表沉降與土體水平位移曲線發(fā)現(xiàn) ,遠處管線對地表下沉仍具有抑制作用 ,但對土體側(cè)向位移未產(chǎn)生影響。
關(guān)鍵詞:基坑開挖 ;地表變形 ;數(shù)值模擬 ;變形規(guī)律
中圖分類號:TU457 文獻標志碼:A 文章編號: 1005- 8249 (2026) 01- 0149- 07
DOI:10. 19860/j.cnki.issn1005 - 8249.2026.01 .026
MENG Yu , ZHANG Yubin , JIN Lei , YAN Penghua
(The First Affiliated Hospital of Nanjing Medical University , Nanjing 210029 , China)
Abstract : To study the deformation law of foundation pits and the influence on the surrounding environment under complex conditions during the excavation process , taking a deep foundation pit of a hospital in Nanjing , Jiangsu Province as the engineering background , numerical simulation was adopted to simulate the entire excavation process of the foundation pit. The deformation laws of the ground surface and underground pipelines and buildings around the foundation pit were analyzed , and the numerical simulation results were verified by the field measurement results . The research results show that after the foundation pit excavation , the ground surface settlement around the foundation pit forms an asymmetrical settlement trough , and the bottom of the foundation pit shows a bottom bulge . The deformation contour of the foundation pit bottom and the adjacent exposed surface is in a typical " mountain " shape . The maximum ground surface settlement is located about 12. 1 m away from the pit wall , with a maximum settlement of 30. 05 mm. The lateral displacement curve is in a " bow " shape , showing " small at both ends and large in the middle " . The peak value migrates downward with the deepening of the excavation. The maximum horizontal displacement is located about 5 m away from the pit wall , with a maximum horizontal displacement of 6. 24 mm in the middle , less than 3 mm at both ends , and less than 1 mm at 20 m away from the wall . The settlement of buildings far from the foundation pit shows a decay characteristic with the increase of distance . Based on the monitoring results , the empirical formula of the influence radius of the ground surface and the excavation depth was fitted . Based on the ground surface settlement and soil horizontal displacement curves , it is found that the pipelines far away still have an inhibitory effect on the ground surface settlement , but have no effect on the soil lateral displacement.
Key words : foundation pit excavation; ground surface deformation; numerical simulation; deformation law
作者簡介:孟 瑜 (1987—) , 男 ,碩士研究生 ,高級工程師 ,研究方向: 工程管理 、結(jié)構(gòu)工程。
通信作者:嚴鵬華 (1987—) , 男 ,碩士研究生 ,高級工程師 ,研究方向: 工程管理 、電氣工程及其自動化。
收稿日期:2025 - 1 1 - 10
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