【作者】 蔚立元； 徐帮树； 李术才； 丁万涛；

【Author】 YU Li-yuan,XU Bang-shu,LI Shu-cai,DING Wan-tao (Research Center of Geotechnical and Structural Engineering,Shandong University,Jinan 250061,China )

【机构】 山东大学岩土与结构工程研究中心；

【摘要】 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。更多还原

【Abstract】 The overburden thickness of underwater tunnel is one of main issues in the longitudinal section design, and the engineering cost and safety are directly governed by the overburden thickness.In order to cope with the tide of underwater tunnel,convenient methods for deciding overburden thickness must be provided to designers. The basic equation of Japanese minimum leakage method is solved by programming under different water depths and excavation areas.According to these results,the empirical formula is fitted.Regression formulas are presented for several longitudinal wave velocities in bedrock after the Norwegian empirical curves are introduced.Based on lots of numerical calculation results and the minimum displacement criterion,functional relationships of overburden thickness,water depth and excavation area are derived forⅡ~Ⅳclassifications of surrounding rock. In the end,the applicabilities of all the empirical formulas are evaluated.更多还原