双线平行盾构掘进对邻近浅基础建筑物影响理论分析

发布时间：2018-03-13 18:19

  本文选题：双线平行盾构隧道　切入点：框架建筑物　出处：《隧道建设》2017年04期 　论文类型：期刊论文

【摘要】：为解决双线平行盾构隧道施工对邻近浅基础建筑物的变形及弯矩变化的影响问题,并对实际掘进工况给出施工建议,利用Sagaseta纵向地表变形计算公式,推导出双线平行盾构掘进影响区内浅基础建筑物地基、基础和结构协同作用的力学模型,分析得到浅基础框架建筑物变形以及弯矩变化规律。研究结果表明:盾构隧道掘进区内,浅基础框架建筑物的弯矩大小随着开挖面的靠近逐渐增大,开挖面到达建筑物正下方附近时达到最大值,之后又逐渐减小;建筑物倾斜率越大,梁端弯矩和底层柱对基础的约束弯矩也越大;双线平行盾构先后掘进相比同时掘进引起的建筑物倾斜更小、沉降变化更加缓和,框架结构及基础梁的弯矩更小,且随着先后掘进开挖面距离的增大,弯矩变化曲线逐渐由V型转变成W型;建议双线平行盾构施工时尽量避免同时掘进,并进一步加强对建筑物首尾沉降差及倾斜率的监测。
[Abstract]:In order to solve the problem of the influence of the double-line parallel shield tunnel construction on the deformation and bending moment change of the adjacent shallow foundation building, and to give the construction suggestion for the actual tunneling condition, the calculation formula of Sagaseta longitudinal surface deformation is used. A mechanical model for the synergistic action of foundation, foundation and structure of shallow foundation in the area affected by double-line parallel shield tunneling is derived. The law of deformation and bending moment change of shallow foundation frame building is obtained. The results show that the moment of shallow foundation frame building increases gradually with the excavation surface approaching in shield tunneling area. When the excavated surface reaches the maximum value near the bottom of the building and then decreases gradually, the larger the slope ratio of the building, the greater the bending moment at the end of the beam and the restrained moment of the bottom column on the foundation. Compared with the parallel shield tunneling, the double-line parallel shield tunneling causes less inclined buildings, more gentle settlement changes, smaller bending moment of frame structure and foundation beam, and with the increase of excavating face distance, The curve of bending moment change gradually from V type to W type, it is suggested that double line parallel shield tunneling should be avoided at the same time, and the monitoring of the settlement difference and slope ratio of the building should be further strengthened.
【作者单位】： 浙江大学城市学院土木工程系;杭州杭港地铁有限公司;宏润建设集团股份有限公司;
【基金】：浙江省自然基金项目(LQ16E080008) 国家自然科学基金资助项目(51278463,51508506)
【分类号】：U455.43
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本文编号：1607601