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（浙江華展工程研究設(shè)計(jì)院有限公司， 寧波 315012）
［摘要］基于寧波軟土地區(qū)典型土層分布和經(jīng)工程反演的計(jì)算參數(shù)，通過MIDAS/GTS有限元分析軟件對不同開挖面積和開挖深度的18個三維基坑有限元模型進(jìn)行數(shù)值計(jì)算。根據(jù)數(shù)值模擬結(jié)果，提出了確定寧波地區(qū)地鐵隧道控制保護(hù)區(qū)范圍的修正方法。通過對工程實(shí)例的實(shí)測結(jié)果進(jìn)行分析，證明了該修正方法的可行性和必要性。進(jìn)一步對比分析了基坑的開挖面積與深度對鄰近隧道位移的影響；通過建立兩類不同分坑措施的基坑模型，比較了不同分坑措施在控制基坑和隧道位移方面上的效果。結(jié)果表明，隧道最大位移隨鄰近基坑開挖面積的增加呈非線性遞增；采用分隔墻與隧道垂直的分坑措施對隧道位移控制更為有利。研究成果可為寧波軟土地區(qū)地鐵隧道控制保護(hù)區(qū)內(nèi)的基坑設(shè)計(jì)提供參考。
［關(guān)鍵詞］隧道保護(hù)； 基坑工程； 空間效應(yīng)； 控制保護(hù)區(qū)； 數(shù)值模擬
中圖分類號：TU753文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2016)02-0091-05
Influence study of spatial effect of deep foundation pit excavation on around
soil and adjacent tunnel
Wu Caide, Zeng Jie, Cheng Yichong, Gong Dikuai
(Zhejiang Huazhan Institute of Engineering Research & Design Co., Ltd., Ningbo 315012, China)
Abstract:Based on the typical soil layer distribution and parameters by engineering back analyses in Ningbo soft soil area, 18 three-dimensional foundation pit finite element models with different excavation areas and depths were numerically calculated by finite element analysis software MIDAS/GTS. According to the numerical simulation results, a modified method was proposed for determining the control and protection area of the subway tunnel in Ningbo. The method′s feasibility and necessity was proved by analyzing field measured results of a practical project. The influences of the excavation area and depth of foundation pits on the displacement of the adjacent tunnel were analyzed. Two foundation pit models with different pit division measures were established to compare the different effects of pit division measures on the displacement control of the foundation pit and tunnel. Results show that maximum displacement of the tunnel increases nonlinearly along with the increase of excavation area adjacent to the tunnel, pit division measure of division walls being in vertical direction to the tunnel is more effective in displacement control of the tunnel. The research achievements can provide references for the foundation pit design in the control and protection area of the subway tunnel in Ningbo soft soil area.
Keywords:tunnel protection; foundation pit engineering; spatial effect; control and protection area; numerical simulation
作者簡介：吳才德，教授級高級工程師，注冊土木工程師（巖土），Email: 136288336@qq.com。
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