高烈度地震区铁路隧道震害特征与整治研究

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摘要 研究目的:为明确震后隧道破坏特征,提出合理的高烈度地震区铁路隧道震害整治技术,依托兰新第二双线大梁隧道震后整治工程开展相关研究工作。现场调研探查大梁隧道震后灾害特征,根据物探、钻探情况及现场收集资料,综合评价震损破坏等级,针对隧道震害损坏情况提出针对性的整治技术措施,结合现场试验及实施情况,明确技术措施应用效果,为后续类似工程及隧道抗震设计提供借鉴。
研究结论:(1)隧道震后出口段地表裂缝以拉张或挤压特征呈羽状展布,裂缝有明显错台现象;(2)隧道结构破坏受断层影响呈明显空间依赖性,特征效应突出,进口和出口段结构分别向右上方和左下方偏移,断层核心区结构错动、变形破坏严重;(3)地面裂缝可采用分层夯填水泥改良土和灌注砂浆结合的方法处理,针对Ⅴ级、Ⅳ级和Ⅲ级及以下破坏段,分别提出“大刚度圆形衬砌+大预留变形量+减震消能层+节段设计”、“格栅钢架+C40模筑混凝土”和“裂缝封闭+基底注浆”的综合整治方案;(4)现场监测结果表明,隧道全段二衬位移稳定,初期支护和二次衬砌以非对称性受力为主要特点,但整体受力较小,证明了支护方案的有效性和合理性。

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	武世燕

关键词 ：高烈度地震区, 铁路隧道, 震后特征, 整治措施, 现场监测

Abstract：Research purposes: To clarify the damage characteristics of tunnel after earthquake and then propose reasonable earthquake damage treatment techniques for high-intensity earthquake area, the relevant research is carried out based on the post-earthquake renovation project for Daliang tunnel in Second Lanzhou-Urumchi double-line. The site investigation is carried out to clarify the disaster characteristics of the Daliang tunnel after the earthquake. Meanwhile, according to geophysical prospecting, drilling and on-site data collection, and based on the comprehensive evaluation of seismic damage, targeted treatment technical measures for the tunnel seismic damage is proposed. Furthermore, in combination with field tests, the application effect of the technical measures proposed in this paper are verified to provide references for similar anti-seismic design for tunnels.
Research conclusions:(1) The surface cracks at the exit section of the tunnel after earthquake are distributed in a feather shape with the characteristics of tension or compression, and the cracks are obviously staggered. (2) The damage of tunnel structure is affected by the fault in a space dependent manner, with prominent characteristic effect. The structure of the entrance and exit sections are shifted to the upper right and the lower left respectively, and the structure dislocation and deformation damage in the core area of the fault are serious. (3) The ground cracks shall be treated by combining layered tamping with cement improved soil and grouting mortar. The comprehensive treatment schemes of "large rigidity circular lining + large reserved deformation+shock absorption and energy dissipation layer+segment design", "grid steel frame + C40 molding concrete" and "crack sealing + base grouting" are proposed for classⅤ,Ⅳ,Ⅲ and below damages, respectively. (4) The field monitoring results show that displacement of secondary lining in whole tunnel is stable, and primary support and secondary lining are mainly characterized by asymmetric stress, but the overall stress is small, which proves effectiveness and rationality of the proposed support scheme.

Key words： high-intensity earthquake area high-speed railway tunnel damage characteristics countermeasures field monitoring

收稿日期: 2022-09-26

PACS:

U455

基金资助:兰新客专门源6.9级地震致灾机理及震后修复关键技术研究(2020KY56(ZDZX)-02)

作者简介: ** 武世燕,1979年出生,女,高级工程师。

引用本文:

武世燕. 高烈度地震区铁路隧道震害特征与整治研究[J]. 铁道工程学报, 2023, 40(1): 76-83.
WU Shiyan. Research on the Damage Characteristics and Countermeasures of Railway Tunnel in High-intensity Earthquake Area. Journal of Railway Engineering Society, 2023, 40(1): 76-83.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2023/V40/I1/76

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