软土地铁盾构隧道环间接头可靠度评价方法

王慧; 黄宏伟

软土地铁盾构隧道环间接头可靠度评价方法 English Version

王慧^1,2,
黄宏伟^1,2

1. 同济大学地下建筑与工程系，上海 200092 ; 2. 同济大学岩土及地下工程教育部重点实验室，上海 200092

基金项目: 国家自然科学基金项目 (50879058)

详细信息

作者简介:
王慧 (1986 – ) ，男，硕士研究生，从事隧道及地下工程风险管理与评估、软土隧道纵向稳定性与长期沉降研究工作。

中图分类号: TU45
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出版历程
- 收稿日期: 2011-04-26
- 发布日期: 2011-11-30

Reliability evaluation method for segment joints of metro shield tunnels in soft soils

WANG Hui^1,2,
HUANG Hong-wei^1,2

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

摘要

摘要: 运营中的软土地铁盾构隧道，受各种内外部因素影响，隧道产生较大的纵向不均匀沉降，进而产生不同程度的环间接头张开，防水性能恶化。利用 4 阶 B 样条插值曲线拟合沉降监测数据并计算纵向附加曲率，可准确反映不均匀沉降程度。综合考虑隧道纵向附加曲率半径、衬砌几何尺寸及沿隧道纵向抗压抗拉刚度比，同时考虑认识不确定性及随机不确定性，分不同显著性水平通过区间 Monte Carlo 抽样模拟计算环间接头的失效概率区间。对失效概率上界值用 4 级评判可直观反映运营隧道环间接头的性能状况，并将评价结果与现场巡检进行对照验证，两者一致性良好。表明该方法可为地铁隧道运营养护决策的制定提供依据。
- 软土地铁盾构隧道 /
- 环间接头 /
- 可靠度 /
- 蒙特卡罗
Abstract: When the metro is in operation, there are increasing longitudinal nonuniform settlements of shield tunnels due to various interior and exterior causes. Therefore, some expansion of shield tunnel segment joints develops in varying degree and the water resistance deteriorates. By using the 4th order B-spline interpolation curve to fit monitoring data and calculate additional longitudinal curvature, the degree of nonuniform settlements can be accurately reflected. Then considering the additional curvature radius, geometrical dimension of segment and longitudinal stiffness ratio, that means aleatory uncertainty and epistemic uncertainty are all considered, an interval Monte Carlo method at different levels of significance is developed to estimate the probability of shield tunnel segment joint failure. Grading the upper bound of the failure probability using four level assessments can directly reflect the operational performance of the segment joints. Inspection and evaluation results are compared and show good consistency. It is proved that the proposed method can provide guidance for the maintenance of shield tunnels in soft soils.
- shield driven tunnel in soft soil /
- segment joint /
- reliability /
- Monte Carlo method

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参考文献(15)

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