岩土工程学报2012，Vol.34Issue(7)：1241-1249,9.
开挖卸荷引起下卧已建盾构隧道的纵向变形研究
Longitudinal deflection of existing shield tunnels due to deep excavation
摘要
Abstract
In the area of infrastructure construction, increasing attention has been paid to the deflection of existing shield tunnels due to deep excavation unloading. The simple two-stage method is adopted to study this problem. The existing shield tunnel is simplified as an infinite beam on a Kerr-type three-parameter elastic foundation. Its governing differential equations are formulated and analytically solved. The parameters of the Kerr model from the simplified elastic continuum method are adjusted by comparing the results with those of finite element models, and comparisons are carried out among Winkler, Pastemak and Kerr models. To obtain more reasonable results, the effects of the lateral soil beside the tunnel are considered and the governing equations are modified and solved accordingly. A good agreement is achieved between the analytical results and finite element ones after considering the lateral effects. The study indicates the superiority of the Kerr foundation model. The effects from the lateral soil are remarkable and should be considered in the analysis.关键词
卸荷/弹性地基/盾构隧道/Kerr地基模型/纵向变形Key words
unloading/elastic foundation/shield tunnel/Kerr foundation model/longitudinal deflection分类
建筑与水利引用本文复制引用
黄栩,黄宏伟,张冬梅..开挖卸荷引起下卧已建盾构隧道的纵向变形研究[J].岩土工程学报,2012,34(7):1241-1249,9.基金项目
国家自然科学基金项目 （）
