考虑多次扰动影响的盾构隧道结构韧性评估方法及其应用

doi:10.11779/CJGE202204001

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摘要科学合理地评估盾构隧道结构状态对保障列车安全运维至关重要。针对目前评估方法无法较好定量评估隧道结构的现状,基于韧性理论,提出了多次扰动下盾构隧道结构韧性评估方法。首先,通过构建多阶段隧道结构韧性分析模型,获得了隧道结构韧性指标计算方法。其次,根据隧道结构在加载和卸载工况下的不同响应,提出了相应工况的结构性能分析指标。在此基础上,定义了隧道结构韧性等级划分标准。然后,探讨了隧道结构性能恢复程度和加固决策时间对结构韧性程度的影响。最后,将该方法应用到新建平行隧道下穿既有隧道工程中。结果表明：采用不同结构性能指标获得的韧性指标差异明显。对于下穿隧道工程而言,仅以收敛变形作为隧道结构性能指标,会导致计算结果偏高,即高估结构的韧性,由下穿案例可知,隧道沉降和轨道板的差异沉降应该更需要关注,尤其是轨道板的差异沉降。研究成果将为盾构隧道结构安全评估及受损结构性能恢复提供重要参考。

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关键词 ：盾构隧道, 韧性评估, 性能指标, 韧性指标

Abstract：It is essential that the shield tunnel lining is evaluated scientifically and reasonably for ensuring the safe operation of the train. In view of the fact that the current evaluation methods cannot quantitatively evaluate the tunnel lining well, an evaluation method is proposed for the resilience of shield tunnel linings considering multiple disturbances based on the resilience theory. First, the method for the resilience indices of the tunnel linings is obtained by establishing a multi-stage resilience analysis model. Secondly, according to different responses of the tunnel linings under the loading and unloading conditions, the performance indices of tunnel linings for the corresponding conditions are proposed. On this basis, the classification standard for the resilience of the tunnel linings is defined. Then, the effects of the performance recovery degree of the linings and reinforcement decision-making time on the tunnel resilience are discussed. Finally, the proposed method is applied to the case of the new parallel tunnels under-crossing existing tunnels. The results show that the resilience indices obtained by using different lining performance indices are obviously different. For the tunnel projects under-crossing existing tunnels, only taking the convergence deformation as the performance indices of the tunnel structure will cause the calculated results to be high, that is, the lining resilience is overestimated. From the case, it is seen that more attention should be paid to the tunnel settlement and the differential settlement of the track slab should be paid more attention to, especially the differential settlement of the track slab. The research results may provide important references for the safety assessment of shield tunnels.

Key words： shield tunnel resilience evaluation performance index resilience index

收稿日期: 2021-06-17

ZTFLH:

TU435

基金资助:国家自然科学基金项目（52090081,52090084,51938008, 52008263）; 博士后创新人才支持计划项目（BX2021196）; 中国工程院战略咨询重点项目（2021-XZ-37）

通讯作者: *（E-mail: sudong@szu.edu.cn）

作者简介: 林星涛(1990— ),男,博士（后）,主要从事地下结构韧性评估与盾构掘进土拱效应及土压力计算等方面的研究。E-mail: xtlin@szu.edu.cn。

引用本文:

林星涛, 陈湘生, 苏栋, 朱旻, 韩凯航, 陈仁朋. 考虑多次扰动影响的盾构隧道结构韧性评估方法及其应用[J]. 岩土工程学报, 2022, 44(4): 591-601. LIN Xing-tao, CHEN Xiang-sheng, SU Dong, ZHU Min, HAN Kai-hang, CHEN Ren-peng. Evaluation method for resilience of shield tunnel linings considering multiple disturbances and its application. Chinese J. Geot. Eng., 2022, 44(4): 591-601.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE202204001 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2022/V44/I4/591

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