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覆盖层厚度是水下隧道纵断面线路设计的主要参数之一,直接制约着工程的安全和造价。为了应对我国大规模建设的水下隧道的浪潮,必须给设计者提供确定覆盖层厚度的简便方法。对于不同的水深和开挖面积,编程求解了日本最小涌水量法的基本公式,并拟合出了经验公式。在介绍挪威经验曲线的基础上,对不同基岩纵波速度提出了相应的回归公式。根据大量数值计算的结果,利用最小位移法判据,分别针对Ⅱ～Ⅳ级围岩条件推导出了覆盖层厚度和开挖面积、水深之间的函数关系。最后,对各种方法的适用性进行了评价。
The thickness of overburden is one of the main parameters of underwater tunnel longitudinal section line design, which directly restricts the safety and cost of the project. In order to cope with the wave of underwater tunnel construction on a large scale in China, it is necessary to provide the designer with a convenient method for determining the thickness of the overburden. For different water depths and excavation area, the basic formula of Japan’s minimum water inflow method was solved programmatically, and the empirical formula was fitted. Based on the introduction of Norwegian experience curve, a corresponding regression formula is proposed for the longitudinal wave velocity of different bedrock. According to the results of a large number of numerical calculations, using the criterion of the minimum displacement method, the relationship between the thickness of cover layer, the area of excavation and the depth of water is deduced respectively according to the condition of Grade Ⅱ ~ Ⅳ surrounding rock. Finally, the applicability of various methods was evaluated.