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(1 同濟(jì)大學(xué)地下建筑與工程系 上海  200092；2 中國海洋大學(xué)環(huán)境科學(xué)與工程學(xué)院 青島 266003)
［提要］ 為了減少基坑開挖引起地鐵隧道的位移，采用大面積深層攪拌樁進(jìn)行加固，但加固施工時也會引起地鐵隧道的隆起，需對其進(jìn)行嚴(yán)格的控制。結(jié)合上海東方路下立交工程，對在地鐵隧道上方大面積加固深層攪拌樁引起隧道的豎向位移進(jìn)行了理論分析。考慮深層攪拌樁施工卸荷、隧道等效剛度以及隧道上方部分加固土體對隧道回彈的抑制等因素，推導(dǎo)了基于彈性地基梁理論計(jì)算隧道豎向位移的預(yù)測方法。在研究的基礎(chǔ)上，提出了大面積深層攪拌樁施工對運(yùn)營地鐵隧道位移的控制方法，可以在相似工程中直接應(yīng)用。
［關(guān)鍵詞］ 深層攪拌樁 地鐵隧道 彈性地基梁 打樁順序

Research of Displacement of Tunnels Induced by Deep Mixing Piles Ground Treatment Method/Liu Tao1,Zheng Jianguo2，Jiang Fengping1

(1 Department of Geotechnical Eng., Tongji University, Shanghai 200092, China;2 Department of Environmental Science and Eng.,Ocean University of China, Qingdao 266003, China)

Abstract:
The East Road Underpass project in Shanghai  adopts deep mixing piles ground treatment method, for decreasing the lifting displacement of tunnels due to excavation. However,deep mixing piles driving would induce the lifting displacement of tunnels, so how to predict and control the displacement to protect tunnel is very important. Based on numerous data,theoretical analysis is conducted on the displacement of tunnels aroused by largescaledeepmixingpiles driving above the tunnels. At the same time, sheltering effects of rows of deep mixng piles on the tunnel displacement are involved. Practical method which can predict the deformation of tunnel is deduced, considering equivalent stiffness of tunnel and group piles effects. The method can be used in other
similar construction.
Keywords:deepmixingpile; largescale ground treatment; subway tunnel; displacement