高速公路隧道明洞合理回填坡率与厚度分析

摘要

结合某高速公路隧道工程实例，以隧道进出口拱形明洞为研究对象，分析了明洞各典型截面在不同回填坡率、不同回填厚度下的内力变化规律及差异，并以拱顶截面安全系数为标准分析总结了各回填坡率下最大回填土厚度，计算结果具有一定普遍性。无特殊构造要求的明洞结构，洞室形状尺寸与该工程类似的均可根据洞顶回填坡率确定最大回填土厚度。%Combining a highway tunnel and taking its arched opencut at the inlet and outlet as the re-search object,the paper analyzed internal force variation and differences of the typical cross-section in different backfilling slope rates and backfilling thickness.The maximum backfilling thickness in dif-ferent backfilling slope rates was summarized based on the vault safety and the calculation results have certain universality.The maximum backfilling thickness could be determined by the rate of the roof backfilling slope in the similar shape and size opencut tunnel which haven't special construction re-quirements.