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随着我国公路建设的不断发展,黄土隧道越来越多,在黄土隧道洞口段极易出现浅埋、偏压等情况,由此而引发隧道洞口段在施工及运营期的各种病害。桩承式复合套拱结构具有施工简便、结构整体稳定性较好等优点,因此可用于黄土隧道洞口段加固。本文以弓家沟隧道为依托工程,利用现场监测、数值模拟等手段对其加固效果进行全面评价。研究结果表明:桩承式复合套拱整体稳定性较好;在偏压地形情况下,应进一步提高预加固桩配筋率,提高其抵抗弯矩能力。
With the continuous development of highway construction in our country, there are more and more loess tunnels, which are prone to shallow burial and bias in the tunnel mouth section of loess tunnel, thus causing various diseases during the construction and operation of tunnel tunnel mouth section. Pile-supported composite arch structure has the advantages of simple construction, better overall structural stability, and therefore can be used for reinforcement of loess tunnel openings. In this paper, based on Gongjiagou tunnel project, the use of on-site monitoring, numerical simulation and other means to conduct a comprehensive evaluation of the reinforcement effect. The results show that the overall stability of pile-supported composite arch arches is good; under the condition of bias topography, the reinforcement ratio of pre-reinforced piles should be further increased to improve its ability to resist bending moment.