盾构隧道接头渗水对其变形及内力的长期影响
发布时间：2018-12-18 21:11
【摘要】：以上海地铁盾构隧道为工程实例,采用有限元软件建立了盾构隧道接头局部渗水模型,计算分析了不同边界条件下盾构隧道接头渗水对隧道变形及内力的影响。计算结果表明:若渗流程度和边界条件不同,则渗流达到稳定状态的时间不同,且进一步导致隧道周围土体孔压的消散程度、地表沉降、隧道变形和管片内力均存在明显差异;地表沉降、隧道直径变化量和管片内力随孔压的发展规律几乎一致;接头渗流会导致管片接缝处孔压明显低于周围土体的孔压,且渗流越严重孔压相差越大。研究表明,在接头渗水严重且没有外部水源补给的极端情况下,孔压、地表沉降、隧道椭圆化变形及管片内力会持续改变且变化幅度较大,尤其是弯矩的改变量非常显著,此种情况下,隧道长期渗水带来的危害最为显著。
[Abstract]:Taking the shield tunnel of Shanghai Metro as an engineering example, the local seepage model of shield tunnel joint is established by using finite element software, and the influence of tunnel joint seepage on tunnel deformation and internal force under different boundary conditions is calculated and analyzed. The results show that if the seepage degree and boundary conditions are different, the time of seepage reaching the stable state is different, and it further leads to the dissipation degree of pore pressure of soil around the tunnel, surface settlement, tunnel deformation and segment internal force. The variation of tunnel diameter and the internal force of the segment are almost consistent with the development of pore pressure, and the seepage at the joint will cause the pore pressure at the joint to be significantly lower than that of the surrounding soil, and the more serious the seepage, the greater the pore pressure. The results show that in the extreme case of serious joint seepage and no external water supply, pore pressure, surface subsidence, elliptical deformation of tunnel and internal force of segment will continuously change and change greatly, especially the change of bending moment is very significant. In this case, the tunnel long-term seepage brings the most significant harm.
【作者单位】： 上海市建筑科学研究院集团;同济大学土木工程学院;
【基金】：国家重点基础研究发展“973”计划项目(2011CB013800)
【分类号】：U455.43
本文编号：2386504
[Abstract]:Taking the shield tunnel of Shanghai Metro as an engineering example, the local seepage model of shield tunnel joint is established by using finite element software, and the influence of tunnel joint seepage on tunnel deformation and internal force under different boundary conditions is calculated and analyzed. The results show that if the seepage degree and boundary conditions are different, the time of seepage reaching the stable state is different, and it further leads to the dissipation degree of pore pressure of soil around the tunnel, surface settlement, tunnel deformation and segment internal force. The variation of tunnel diameter and the internal force of the segment are almost consistent with the development of pore pressure, and the seepage at the joint will cause the pore pressure at the joint to be significantly lower than that of the surrounding soil, and the more serious the seepage, the greater the pore pressure. The results show that in the extreme case of serious joint seepage and no external water supply, pore pressure, surface subsidence, elliptical deformation of tunnel and internal force of segment will continuously change and change greatly, especially the change of bending moment is very significant. In this case, the tunnel long-term seepage brings the most significant harm.
【作者单位】： 上海市建筑科学研究院集团;同济大学土木工程学院;
【基金】：国家重点基础研究发展“973”计划项目(2011CB013800)
【分类号】：U455.43
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