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Structural responses and treatments of shield tunnel due to leakage: A case study
Tunnelling and Underground Space Technology ( IF 6.9 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.tust.2020.103471
Dejun Liu , Fei Wang , Qunfang Hu , Hongwei Huang , Jianping Zuo , Cong Tian , Dongming Zhang

Abstract Structural performance of shield tunnels is of paramount concern during their long-time service. This work presents a case study describing the structural responses of a shield tunnel caused by unexpected leakage and the corresponding treatment measures. Firstly, the general information of the accident is introduced, and the structural responses of segmental lining are highlighted, e.g., longitudinal differential settlement, horizontal convergence, dislocation among rings, and concrete spalling. On this basis, the influence mechanism of leakage on the structural responses is preliminarily discussed. Finally, the treatment measures are proposed and their effectiveness is evaluated by field application. The research results show that the structural response caused by leakage is mainly differential settlement, but the horizontal deformation is not significant. The differential settlement further causes dislocation among rings and concrete spalling. The maximum settlement of the lower line tunnel and the upper one occurs at the special lining rings where the leakage occurs, and the maximum values are 580.4 mm and 301.3 mm, respectively. There is no dislocation among the special lining rings. However, severe dislocations of about 10 ordinary concrete segmental rings are observed on both sides of the special lining rings. The value of the dislocation increases first and then decreases when approaching closer to the special lining rings. Correspondingly, the concrete around the circumferential joints is also severely spalled. The greater the dislocation, the more severe the concrete spalling. The longitudinal differential settlement and dislocation among rings are effectively controlled by the proposed measures, mainly including polyurethane grouting and bonding steel plates by full-ring and across circumferential joints. The case presented can be used as a reference in similar conditions.

中文翻译:

盾构隧道渗漏引起的结构响应与处理:案例研究

摘要 盾构隧道在其长期服役过程中,其结构性能是最受关注的问题。这项工作提供了一个案例研究,描述了由意外泄漏引起的盾构隧道的结构响应和相应的处理措施。首先介绍了事故的一般情况,突出了管片衬砌的结构响应,如纵向不均匀沉降、水平收敛、环间错位、混凝土剥落等。在此基础上,初步探讨了渗漏对结构响应的影响机制。最后提出处理措施,并通过现场应用评价其有效性。研究结果表明,渗漏引起的结构响应主要是差异沉降,但横向变形不显着。不均匀沉降进一步引起环间错位和混凝土剥落。下线隧道和上线隧道的最大沉降发生在发生渗漏的特殊衬砌环处,最大值分别为580.4 mm和301.3 mm。特殊衬环之间无错位。然而,在特殊衬砌环的两侧观察到约10个普通混凝土管片环的严重错位。当接近特殊衬环时,位错值先增大后减小。相应地,圆周接缝周围的混凝土也严重剥落。错位越大,混凝土剥落越严重。环间纵向差异沉降和错位通过所提出的措施得到有效控制,主要包括聚氨酯灌浆和全环和跨圆周接头粘合钢板。所提供的案例可以作为类似条件下的参考。
更新日期:2020-09-01
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