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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。
In operation, the subway tunnel with soft soil is affected by various internal and external factors, and the tunnel will have a large longitudinal uneven settlement, resulting in varying degrees of open joints between the rings, deteriorating waterproof performance. The fourth-order B-spline interpolation curve fitting settlement monitoring data and calculate the longitudinal additional curvature can accurately reflect the degree of uneven settlement. Considering tunnel longitudinal additional curvature radius, liner geometry and longitudinal compression ratio along the tunnel, taking into account the uncertainty of understanding and stochastic uncertainty, the Monte Carlo sampling simulation of inter-band joints Failure probability interval. The upper bound of failure probability can be directly evaluated by 4 levels to directly reflect the performance of the joint between tunnels and verify the evaluation result with the on-site inspection. The consistency between the two is good. It shows that this method can provide the basis for the decision-making of subway tunnel operation and maintenance.