震裂软岩隧道围岩-支护失稳机制和处治机理分析

发布时间：2018-05-15 07:29

本文选题：隧道工程 + 震裂软岩　；参考：《公路交通科技》2014年08期

【摘要】：以穿越5·12发震断裂带(龙门山断裂带)的广甘高速公路软岩隧道为工程依托,依据对施工现场频发的围岩-支护结构失稳破坏的统计,以及典型失稳案例的分析,探讨了震裂软岩隧道围岩-支护失稳机制及处治机理,并选取具有代表性的围岩-支护失稳段为试验段,对其处治机理及效果进行验证分析。研究结果表明:隧址区岩体受地震及新近地震的反复揉搓,致使山体内部岩体产生震裂损失、围岩稳定性不足、地下水的渗透性增强、围岩与支护结构不能密切接触,是造成软岩隧道围岩-支护失稳事故的直接诱因;通过掌子面反压回填、地下水引排、塌腔回填、加强超前支护、基底注浆加固、改善施工工法和加强支护参数等处治措施,可有效地稳定掌子面前方松动岩体、控制震裂松动围岩压力、增强围岩-支护体系的稳定性,且使支护体系具备一定的安全储备能力。
[Abstract]:Based on the soft rock tunnel of Guanggan Expressway which passes through the 512 seismogenic fault zone (Longmenshan fault zone), based on the statistics of the frequent failure of surrounding rock and support structure in the construction site and the analysis of typical unstable cases, This paper discusses the mechanism and treatment mechanism of surrounding rock support instability of soft rock tunnel, and selects the representative wall rock support instability section as test section, and verifies and analyzes its treatment mechanism and effect. The results show that the rock mass in the tunnel area is rubbed repeatedly by earthquakes and recent earthquakes, which results in the rock mass in the mountain body producing earthquake crack loss, the stability of surrounding rock is insufficient, the permeability of underground water is enhanced, and the surrounding rock and supporting structure can not be contacted closely. It is a direct inducement to the failure of surrounding rock and support in soft rock tunnel, through the counter pressure backfilling of the face, the drainage of groundwater, the backfilling of cavities, the strengthening of the advance support, the reinforcement of the foundation grouting, the improvement of the construction method and the strengthening of the supporting parameters, etc. It can effectively stabilize the loose rock mass in front of the face, control the pressure of the loosened rock mass, enhance the stability of the surrounding rock support system, and make the support system have certain safety reserve ability.
【作者单位】：西南交通大学土木工程学院;四川高速公路建设开发总公司;
【基金】：国家重点基础研究发展计划(九七三计划)项目(2010CB732105) 国家科技支撑计划课题项目(2012BAG05B03) 国家自然科学基金项目(51378434) 四川省交通科学技术项目(2008.1-1-1) 西南交通大学博士研究生创新基金项目(201302)
【分类号】：U455.7;U457

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