浅埋暗挖河底隧道的衬砌受力性状研究

发布时间：2018-05-26 10:09

本文选题：河底隧道 + 浅埋暗挖法　；参考：《公路》2017年02期

【摘要】：针对采用浅埋暗挖法修建的河底公路隧道,通过数值模拟、经验公式与现场实测,研究不同时期的衬砌受力性状。结果表明,在不同河水位下完成双洞的开挖与初衬,河水位越高,初衬拱顶的最大沉降也越大,但先行洞初衬拱顶最大沉降的增加幅度要大于后行洞初衬拱顶最大沉降的增加幅度;可采用折减系数法计算施作二衬前的初衬背后水压力,提出的折减系数的经验取值方法可供类似工程参考;在隧道长期运营后,相比接触密实的状态,仰拱衬砌与围岩之间接触松散使二衬的最大拉应力与最大压应力均增加;提出了隧道上方河水位的经验计算方法,可为研究衬砌的长期受力性状提供参考。
[Abstract]:In view of the highway tunnel built by shallow buried excavation method, through numerical simulation, empirical formula and field measurement, the mechanical behavior of lining in different periods is studied. The results show that the higher the river level is, the greater the maximum settlement of the initial arch is when the excavation and lining of the double holes are completed under different river levels. However, the maximum settlement of the first lining of the first tunnel is greater than that of the maximum settlement of the arch in the first line of the tunnel, and the water pressure behind the first lining can be calculated by using the method of reduction coefficient. The empirical calculation method of the reduction coefficient can be used as a reference for similar projects. After the tunnel is operated for a long time, the maximum tensile stress and the maximum compressive stress of the second lining are increased when the contact between the invert lining and the surrounding rock is loose compared with the contact dense state. The empirical calculation method of river water level over tunnel is put forward, which can be used as a reference for studying the long term mechanical behavior of lining.
【作者单位】：湖南科技大学土木工程学院;湖南科技大学岩土工程稳定控制与健康监测省重点实验室;
【基金】：国家自然科学基金项目,项目编号51408216 湖南省自然科学基金资助项目,项目编号2015JJ6038
【分类号】：U451.4;U459.5

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