丽龙高速公路马岭头隧道工程病害分析与整治措施研究

发布时间：2018-04-05 12:51

本文选题：公路隧道　切入点：膨胀性围岩　出处：《长安大学》2016年硕士论文

【摘要】：为适应经济发展的要求,近30年来,我国修建了大量公路隧道。随着在役隧道服务时间的增加,很多隧道出现了不同程度的病害现象。病害隧道中,穿过膨胀性围岩地带的隧道的病害尤为显著。据统计,膨胀岩对各种结构工程具有极大危害,全世界每年因膨胀岩造成的经济损失高达数亿美元。我国是膨胀性岩土体分布较为广泛的国家,分布在陕西等近20省份,膨胀性岩土介质导致结构病害较为普遍,它的特殊性质给我国的工程建设造成了严重的经济损失和生态环境破坏。本文以丽龙高速公路马岭头隧道工程为依托,通过资料收集,对该隧道原有设计及其变更情况进行分析,同时结合该隧道病害发生的历史及其治理措施进行详细梳理。在此基础上,结合该隧道病害现有状况,对该隧道的病害程度进行了专项检测。检测内容主要包括:隧道衬砌厚度、衬砌混凝土强度及衬砌和路面裂缝等。通过专项检测数据,对衬砌厚度等三个方面的结果进行了分析,进步明确了该隧道衬砌结构与现有病害实际状态。为了揭示隧道病害产生的根本原因,对隧道周边围岩与地质状况进行补充调查与勘探,经补充调查与勘探后发现:马岭头隧道所在山体存在断层破碎带,断层破碎带的岩性为泥岩、泥质粉砂岩,具体成分主要为蒙脱石、伊利石、绿泥石等黏土矿物,具有膨胀性,且断层破碎带位于马岭头隧道左右洞之间,且该断层走向与隧道轴向间角度较小,揭示了病害产生的原因,也为该隧道病害整治奠定了基础。结合隧道病害,本文对隧道支护结构的安全性进行了数值分析,经分析发现:支护结构安全系数不能满足规范的要求,隧道结构安全存在潜在风险。最后,结合马岭头隧道工程病害实际,提出了相应的工程治理方案,依据各治理方案在具体实施过程中的可行性与效果的好坏,进行方案比选,确定了最终治理方案,体现为该方案整治措施为主动防水与被动加固相结合的方法,采用重新施作二次衬砌的加固方案,把注浆帷幕技术引进本隧道膨胀岩病害整治中,通过治理后该隧道使用效果来看,达到了最初的目的。
[Abstract]:In order to meet the requirements of economic development, a large number of highway tunnels have been built in China in the past 30 years.With the increase of service time in service tunnels, many tunnels appear different degrees of disease phenomenon.In the diseased tunnel, the disease of the tunnel passing through the expansive surrounding rock zone is especially significant.According to statistics, expansive rock has great harm to all kinds of structural engineering. The economic loss caused by expansive rock in the world is hundreds of millions of dollars every year.China is a country with extensive distribution of expansive rock and soil mass, which is distributed in nearly 20 provinces of Shaanxi and other provinces.Its special nature has caused serious economic loss and ecological environment damage to the engineering construction of our country.Based on the Malingtou Tunnel Project of Lilong Expressway, this paper analyzes the original design of the tunnel and its changes through data collection, and combs in detail the history of the tunnel disease and its treatment measures.On this basis, combined with the existing condition of the tunnel disease, the disease degree of the tunnel was detected.The main contents include: tunnel lining thickness, lining concrete strength, lining and pavement cracks.Based on the special test data, the results of three aspects, such as lining thickness, are analyzed, and the actual condition of the tunnel lining structure and existing diseases is clarified.In order to reveal the root cause of tunnel disease, supplementary investigation and exploration on surrounding rock and geological condition of tunnel are carried out. After supplementary investigation and exploration, it is found that there is a fault fracture zone in the mountain body of Malingtou Tunnel.The lithology of the fault fracture zone is mudstone, argillaceous siltstone, and the concrete composition is mainly montmorillonite, Illite, chlorite and other clay minerals, and the fault fracture zone is located between the left and right cavities of the Malingtou Tunnel.The angle between the fault strike and the tunnel axis is small, which reveals the cause of the disease and lays a foundation for the tunnel disease treatment.Combined with tunnel diseases, the safety of tunnel support structure is numerically analyzed in this paper. It is found that the safety factor of supporting structure can not meet the requirements of the code, and there are potential risks to the safety of tunnel structure.Finally, combining with the actual condition of the malingtou tunnel project, the corresponding project treatment scheme is put forward. According to the feasibility and effect of each treatment plan in the concrete implementation process, the scheme is compared and selected, and the final treatment plan is determined.This scheme is reflected in the combination of active waterproofing and passive reinforcement. The grouting curtain technology is introduced into the treatment of the expansive rock disease in this tunnel by means of the reinforcement scheme which is reapplied as the secondary lining.Through the treatment of the tunnel after the use of effect, to achieve the initial purpose.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U457.2

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