铁路隧道底部混凝土质量评定的研究与应用

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摘要研究目的:铁路隧道底部是列车运营的承载结构，其质量缺陷极易诱发运营隧道发生底鼓、翻浆冒泥、无砟轨道道床板开裂等病害,从而严重干扰运输,影响行车安全，经济损失很大。因此研究评定铁路隧道底部混凝土质量缺陷等级和处理方案十分必要。
研究结论:（1)隧道底部质量缺陷根本原因是现场管理薄弱，因此必须加强管理，加强检查与监督,避免隧道底部质量缺陷的发生;（2)采用缺陷面积比和缺陷厚度比评定铁路隧道底部结构质量缺陷等级,评定结果可分为轻微、较严重、严重、很严重、极严重5个级别；（3)针对不同的缺陷可对应采取注浆、注浆+锚杆、拆除重做的处理方案，采取拆换重做时,按小于衬砌台车长度3 m作为一次拆除长度单元，经有限元模拟计算和现场应用,对围岩、初期支护和二次衬砌影响不大，是安全的；（4)该研究成果可供铁路隧道底部混凝土质量缺陷等级评定和处理参考。

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	张民庆
	何志军
	游旭
	吴川
	高金喜

关键词 ：隧道, 混凝土, 质量缺陷, 等级评定, 处理

Abstract：Research purposes ： The bottom of railway tunnel is the bearing structure of train operation，quality defects easily induce operating tunnel floor heave，mud pumping，cracking and other diseases，thus seriously interfere with the transport，affect driving safety，economic loss is very large. So the evaluation of the hierarchy and treatment scheme of concrete quality defects at the bottom of railway tunnel is necessary.
Research conclusions ： (1) The root cause of quality defects at the bottom of tunnel is the weak site management，
therefore，must strengthen management， and strengthen inspection and supervision， to avoid thequality defects at the bottom of the tunnel. (2) The defect area ratio and the defect thickness ratio are used to evaluate structure defects at the bottom of railway tunnel，the results of the evaluation can be divided into five levels ： slight，more serious，serious，very serious and extremely serious. (3) According to different defect， the corresponding processing schemes such as grouting，grouting + anchor，dismantlement and redoing can be adopted. Taking the dismantlement and redoing，less than lining shutter length 3 m as a dismantled length unit， by the finite element numerical simulation and field application，has little influence on surrounding rock，initial support and secondary lining，and is safe. (4) The research results can be used for quality rating and processing of railway tunnel concrete.

Key words： tunnel concrete quality defects rating deal with

收稿日期: 2015-04-24

作者简介: 张民庆，１９７０年出生，男，教授级高级工程师。

引用本文:

张民庆,何志军,游旭,吴川,高金喜. 铁路隧道底部混凝土质量评定的研究与应用[J]. 铁道工程学报, 2015, 32(9): 85-91.
ZHANG Min -qing，HE Zhi - jun，YOU Xu，WU Chuan，GAO Jin -xi. Study and Application of Concrete Quality Evaluation at the Bottom of the Railway Tunnel. Journal of Railway Engineering Society, 2015, 32(9): 85-91.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2015/V32/I9/85

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