天津软土地区盾构掘进对上方建筑物影响分析

发布时间：2018-04-18 22:24

本文选题：小应变本构 + 隧道施工　；参考：《岩土力学》2014年S2期

【摘要】：以天津地铁2号线下穿多层建筑物的盾构隧道为例,建立了盾构下穿空旷场地以及下穿建筑物的有限元模型,计算结果与现场实测数据进行了对比验证。在此基础上分析了在天津软土地区盾构隧道施工对地表沉降及多层砌体结构建筑物差异沉降的影响,并对采用小应变土体本构模型与硬化土本构模型的计算结果进行比较。结果表明,采用小应变本构模型的地表最大沉降和横向沉降槽宽度与实测数据吻合良好。盾构斜下穿砌体结构房屋时,建筑物有偏向隧道轴线方向的倾斜,采用小应变土体本构模型的计算结果可以更好地反映建筑物的倾斜斜率的变化。因此,研究软土地区盾构掘进对上方建筑物沉降影响的精细化分析时应考虑土体小应变的影响。
[Abstract]:The finite element model of the shield tunnel under the shield tunnel of Tianjin Metro Line 2 is established. The results are compared with the measured data.On this basis, the influence of shield tunnel construction on surface settlement and differential settlement of multi-story masonry structures in soft soil area of Tianjin is analyzed, and the calculation results using small strain soil constitutive model and hardening soil constitutive model are compared.The results show that the maximum settlement and transverse settlement trough width of the small strain constitutive model are in good agreement with the measured data.When the shield tunneling is inclined through the masonry structure, the building is inclined to the axis of the tunnel. The calculation results of the small strain soil constitutive model can better reflect the change of the slope of the building.Therefore, the influence of small strain of soil should be taken into account in the detailed analysis of the influence of shield tunneling on the settlement of buildings in soft soil area.
【作者单位】：天津大学滨海土木工程结构与安全教育部重点实验室;天津大学建筑工程学院;
【基金】：国家重点基础研究发展计划(973计划)资助项目(No.2010CB732106) 国家科技支撑计划自主项目(No.2012BAJ01B02-03)
【分类号】：U455.43

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