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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。
Aimed at the riverbed tunnel constructed by shallow burying and undercutting method, the stress behavior of lining at different periods is studied by numerical simulation, empirical formula and field measurement. The results show that the excavation and initial lining of double holes are completed under different river water levels. The higher the water level is, the greater the settlement of the primary lining dome is. However, the maximum settlement of the primary lining of the primary cave increases more than that of the original one The increase of the maximum settlement of the initial lining of a cave can be calculated by the reduction factor method and the proposed value reduction method can be used for reference of similar projects. , The maximum tensile stress and the maximum compressive stress of the lining increase compared with that of the abutment lining and the surrounding rock when compared with the densely-grounded state. An empirical calculation method of the water level above the tunnel is proposed, which can be used to study the long- Force traits provide a reference.