浅埋大断面小净距隧道支护受力特性实测与模拟研究
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The Measurement and Simulation on Stress Characteristics of Shallow Buried Tunnel with Large Section and Small Clear Distance
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    摘要:

    浅埋大断面小净距隧道围岩稳定性差,加上相邻隧道间相互扰动频繁,支护结构受力复杂,极易引发隧道塌方与地表变形等问题,严重威胁隧道施工安全。以重庆海天堡隧道为背景,采用现场监测与数值模拟相结合的方法,对浅埋大断面小净距隧道围岩压力与复合式衬砌内力的施工响应规律进行研究。结果表明:相邻隧道施工相互扰动明显,后行隧道核心土开挖对先行隧道围岩压力释放影响最为显著;先行隧道支护可通过加固围岩实现小净距隧道压力拱水平减跨,进而提高后行隧道围岩承载力;针对浅埋大断面小净距隧道开挖,双侧壁导坑法可有效控制围岩变形及压力释放。基于该隧道开挖方法的围岩压力及支护受力施工响应规律可为施工方案的优化提供借鉴与参考。

    Abstract:

    The surrounding rock stability of shallow buried tunnel with large section and small clear distance is poor, and the mutual disturbance between tunnels is frequent, which is very easy to cause disasters such as chamber collapse and surface collapse. Therefore, the stress state of tunnel surrounding rock and the stress characteristics of support are very important for tunnel stability control. Taking the tunnel under construction as the background, the construction response law of surrounding rock pressure and internal force of composite lining of shallow buried tunnel with large section and small clear distance is analyzed by using the method of field monitoring and numerical simulation. The results show that the former tunnel support can reduce the horizontal span of the soil arch of the tunnel with small clear distance by strengthening the surrounding rock, so as to improve the bearing capacity of the surrounding rock of the later tunnel. The construction of adjacent tunnels disturbs each other obviously, and the excavation of the core soil of the later tunnel has the most significant impact on the pressure release of the surrounding rock of the former tunnel. In addition, for the excavation of shallow buried large section and small clear distance tunnel, the double sides heading method can effectively control the surrounding rock deformation and pressure release, and the surrounding rock pressure and support stress construction response law based on the tunnel excavation method can provide reference for the optimization of construction scheme.

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李晓军,杨正旭,黄锋,王程平,刘星辰.浅埋大断面小净距隧道支护受力特性实测与模拟研究[J].科技与产业,2022,22(08):309-314

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  • 在线发布日期: 2022-08-23