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地铁隧道正交穿越地裂缝的相互作用机制试验研究 被引量:19

TEST STUDY OF INTERACTION MECHANISM UNDER METRO TUNNEL ORTHOGONALLY CROSSING GROUND FISSURE
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摘要 以西安地铁隧道为工程背景,利用地铁隧道正交穿越地裂缝应力模型试验,分析在地裂缝活动环境下的地铁隧道与地裂缝的相互作用关系。在地裂缝上、下盘发生相对错动时,对模型结构的纵向应变、结构底部的相对位移以及结构外围土压力等进行监测。数据分析结果表明:地铁隧道穿越地裂缝时其荷载传递机制涉及结构的刚度效应、下卧土体的支承作用、隧道与土体之间的摩阻作用以及裂缝处上下盘的接触效应4个方面。根据隧道结构变形特征及应变变化规律,构建隧道与土体底部脱空状态下相互作用力学模型,为西安地铁穿越地裂缝的隧道结构设计提供参考。通过对不同断面隧道的应变及变形比较分析,提出地铁隧道正交穿越地裂缝带时宜采用马蹄形隧道断面,以提高结构的整体刚度;加强位于地裂缝下盘的隧道混凝土的裂缝控制,做好防水处理。 Based on the Xi'an metro tunnel passing through active ground fissure zones,the interaction between tunnel structure and soil under metro tunnel which orthogonally crossing the ground fissure belt is studied by a physical modeling experiment.When the upper and lower plate dislocate relatively,the longitudinal strains of structure,the relative displacement at the bottom of the tunnel and the peripheral soil pressure are analyzed.The test results indicate that the load transfer mechanism of the interaction between the tunnel structure crossing the ground fissure and soil contains four factors,specifically,the structure stiffness effects,supporting action of underlying layer,the friction force between tunnel structure and soil,and the effect of contact between the hanging wall and the footwall.According to the deformation behavior and the strain variation rule,the mechanical model for the interaction between tunnel and soil is created under the void state which is at the bottom of the tunnel.The research results may provide references for the structure design of the tunnel when the Xi'an metro tunnel crossing the ground fissure.Through the comparison of several different sections of tunnels,two points of views are come up.The first one is the horseshoe tunnel should be utilized in preference to other tunnels when the metro tunnel orthogonally crossing the ground fissure belt,which can improve the structure stiffness.The second one is controlling the crack of the concrete tunnel which located in the lower plate of the ground fissure at the same time,and coping with the waterproof treatment.
出处 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2011年第3期556-563,共8页 Chinese Journal of Rock Mechanics and Engineering
基金 国家自然科学基金资助项目(40772183 50908018) 中央高校基本科研业务费专项资助项目(CHD2010JC073)
关键词 隧道工程 相互作用 地裂缝 模型试验 正交穿越 tunnelling engineering interaction ground fissure model test orthogonally crossing
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