【摘要】：上海世博片區(qū)綠谷一期深大基坑工程緊鄰越江雙線盾構(gòu)隧道,基坑環(huán)境保護要求高,基坑采用分區(qū)方案實施。以PLAXIS3D有限元軟件建立基坑與鄰近隧道的三維有限元模型,土體采用HS-Small小應(yīng)變本構(gòu)模型,對基坑分區(qū)開挖的過程進行了動態(tài)模擬。計算結(jié)果與實測結(jié)果對比表明,采用HS-Small小應(yīng)變土體本構(gòu)模型的三維有限元分析能較好地模擬基坑的變形以及基坑開挖對鄰近隧道的影響;分區(qū)施工方案通過減小單個基坑的規(guī)模,充分利用了基坑的時空效應(yīng),起到了很好的變形控制作用。
[Abstract]:In Shanghai World Expo area, the first stage of the deep and large deep foundation pit project of Shanghai World Expo area is next to the double-line shield tunnel across the river. The environmental protection of the foundation pit is very high, and the foundation pit is implemented by zoning scheme. The three-dimensional finite element model of foundation pit and adjacent tunnel was established by PLAXIS3D finite element software, and the dynamic simulation of excavation process was carried out by using HS-Small small strain constitutive model. The comparison between the calculated results and the measured results shows that the three-dimensional finite element analysis based on HS-Small small strain soil constitutive model can well simulate the deformation of foundation pit and the influence of excavation on adjacent tunnels. By reducing the scale of a single foundation pit, the zoning construction scheme makes full use of the space-time effect of the foundation pit and plays a good role in deformation control.
【作者單位】： 同濟大學(xué)地下建筑與工程系;華東建筑設(shè)計研究院有限公司;上�；庸こ汰h(huán)境安全控制工程技術(shù)研究中心;
【基金】：上海市浦江人才計劃(15P51433500)
【分類號】：U456.3;TU753

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