堆土导致的地铁盾构隧道病害及处治对策分析

发布时间：2018-01-05 07:33

本文关键词：堆土导致的地铁盾构隧道病害及处治对策分析　出处：《中外公路》2017年01期 　论文类型：期刊论文

【摘要】：针对地铁隧道地表堆土的现象,开展洞内监测及病害调查工作,探明堆土影响下结构变形过程,并对管片结构裂缝、错台、渗漏水、道床脱空等病害特征进行分析、评价。基于结构病害现状,明确不同区段的损伤程度,制定相适应的修复方案及补强措施。针对粘钢加固措施,在确定施工工序的前提下,建立二维仿真计算模型,分析加固后结构受力分布特征及承载性能。研究表明:加固前偶数环最大正弯矩位置承载性能下降66%,最大负弯矩位置承载能力下降73%,加固后承载性能满足规范要求;加固前奇数环最大正弯矩承载性能下降34%,最大负弯矩位置承载性能下降25%,加固后承载性能均满足规范要求,加固方案合理,加固效果明显。
[Abstract]:In view of the phenomenon of underground tunnel surface heaps, the monitoring and disease investigation are carried out to find out the deformation process of the structure under the influence of pile soil, and to detect the cracks, staggered platforms and leakage water of the segment structure. Based on the present situation of structural diseases, the damage degree of different sections is determined, and appropriate repair schemes and reinforcement measures are formulated. Under the premise of determining the construction procedure, a two-dimensional simulation calculation model is established to analyze the stress distribution characteristics and bearing performance of the reinforced structure. The results show that the load bearing capacity of the maximum positive moment position of the even number ring before reinforcement is reduced by 66%. The bearing capacity of the maximum negative moment position is reduced by 73 parts, and the bearing capacity after reinforcement meets the requirements of the code. Before reinforcement, the bearing capacity of odd ring maximum positive moment decreases 34%, and the maximum negative moment position decreases 25%. After reinforcement, the loading performance meets the requirements of the code, the reinforcement scheme is reasonable, and the reinforcement effect is obvious.
【作者单位】：郑州市轨道交通有限公司;
【分类号】：U455.43;U231.3
【正文快照】： 地铁隧道投入运营后,其长期服役性能除受地下水侵蚀、材料劣化、列车振动等因素影响外,周边工程活动也是导致结构病害频发的一大主要因素,特别是违禁堆载、开挖等。堆载作用下,隧道结构原有承载体系改变,结构变形显著增大,接缝张开甚至出现裂损、错台等,导致结构承载力下降;同

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