(1. Institute of Geotechnical Engineering，Zhejiang University of Technology，Hangzhou，Zhejiang 310023，China；
2. Dongtong Geotechnical Technology Co.，Ltd.，Hangzhou，Zhejiang 310000，China；
3. Institute of Transportation Engineering，Zhejiang University，Hangzhou，Zhejiang 310058，China)
Abstract：In order to study the effect of isolation pile on controlling the displacement and deformation of the tunnel with adjacent excavation，laboratory 1 g model tests were carried out in dry sand. Three groups of experiments including no isolation pile，isolation pile with embedment depth and isolation pile without embedment depth were designed and conducted. The horizontal displacement of retaining structure and the displacement and circumferential bending moment of tunnel were monitored and studied. The results showed that， without isolation pile，the horizontal displacement of retaining structure，the horizontal and vertical displacements and circumferential bending moment of tunnel all increased with excavation process(an increase of the ratio of excavation depth to the tunnel depth). In the case of isolation pile with embedment depth，compared to the case without isolation pile，the horizontal displacement of retaining structure，the horizontal and vertical displacements of tunnel，and the positive and negative circumferential bending moments of tunnel were all well controlled. In the case of isolation pile without embedment depth，compared to the case without isolation pile，the horizontal displacement of retaining structure，and the positive and negative circumferential bending moments of tunnel decreased. However，the horizontal and vertical displacements of tunnel increased by 32.0% and 123.8%，respectively. It was found that，the tunnel was mainly influenced by the isolation and drag effects of the isolation pile.
徐晓兵1，胡 琦1，2，曾理彬1，王金昌3，王 哲1. 隔离桩对干砂地基中基坑侧方隧道影响的模型试验研究[J]. 岩石力学与工程学报, 2020, 39(S1): 3015-3022.
XU Xiaobing1，HU Qi1，2，ZENG Libin1，WANG Jinchang3，WANG Zhe1. Model tests on the effect of isolation pile on existing tunnel with adjacent excavation in dry sand. , 2020, 39(S1): 3015-3022.
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2020, Vol. 39 
