结构性软土中隧道对邻近桩基的长期影响数值分析  

Numerical analysis of long-term effects of tunnel excavation on adjacent pile foundation in structured soft soils

作　　者：冷建[1] 卞荣 刘燕平 叶冠林[1] 

机构地区：[1]上海交通大学土木工程系,上海200240 [2]浙江浙电经济技术研究院,浙江杭州310014

出　　处：《岩土工程学报》2013年第S2期352-356,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41002097)

摘　　要：为了掌握软土结构性对地层长期沉降和邻近桩基长期受力的影响规律,基于能考虑土体结构性的弹塑性本构模型,采用水土耦合有限元开展相关数值分析。有限元分析结果表明,在饱和结构性软土地层中,隧道施工期间将产生显著的超孔隙水压;是工后期间,超孔压逐渐消散,隧道周边土体的结构性也慢慢丧失,地层产生长期沉降,邻近桩基受力也需要长时间才能稳定;而且土结构性越强,地表长期沉降量和邻近桩基弯矩值也越大。In order to study the effect of natural soil structure on tunnel construction and the influence of water-soil coupling of finite element calculation, based on the elasto-plastic model, the soils with different initial structures are chosen, to analyze the interaction between the tunnel and the soils. The finite element analysis results show that in the saturated soft soil layer, after excavation, with gradual decrease of pore pressure, the structure of the soils surrounding the tunnel slowly disappears, the long-term deformation of soil strata is caused, and the stress of the adjacent pile foundation also needs long time to be stabilized. The larger the structured soils, the greater the surface subsidence and the larger bending moment of the adjacent piles will be caused.

关 键 词：饱和软土 结构性 隧道 桩基 水土耦合有限元 

分 类 号：U452.11[建筑科学—桥梁与隧道工程]