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为了选择落石威胁下的严重偏压地形地段的合理工程方案,满足工程美学和环保要求,通过各种方案比选,提出一种新型结构形式—Z形刚架半棚式明洞。针对落石冲击荷载进行计算分析,分析结果表明:在各种冲击角度下,冲击荷载小于1800 k N时,各部位第一主应力均小于混凝土抗拉极限强度;Z形刚架半棚式明洞具有较强的抗落石冲击能力,具有较好的安全性。Z形刚架半棚式明洞具有开挖小,能承受落石荷载较大,受力特性较好,结构美观,对沿途景观和植被破坏小,施工较为方便等优点,具有较好的应用前景,可给隧道设计、施工和研究提供有益的借鉴和参考。
In order to select the reasonable engineering scheme of the severely biased terrain under the threat of falling rocks and meet the requirements of engineering aesthetics and environmental protection, a new type of structural form-Z-shaped rigid frame half-shank Myung-dong was proposed through various schemes and comparison. According to the calculation and analysis of impact load of rockfall, the analysis results show that the first principal stress of each part is less than the ultimate tensile strength of concrete under various impact angles when the impact load is less than 1800 kN; Has strong resistance to rockfall impact, with good safety. The Z-shaped rigid frame half-roofed Myeong-dong has the advantages of small excavation, large load of falling rock, good stress characteristics, beautiful structure, small damage to the landscape and vegetation along the way, and convenient construction, which has a good prospect of application , Which can provide useful reference and reference for tunnel design, construction and research.