公路连拱隧道土压力荷载的计算方法研究

Research on calculation metheods of earth pressure on muti-arch tunnel for highway

针对目前国内公路连拱隧道尚无比较成熟的土压力荷载计算公式的现状,根据连拱隧道的受力特点,基于普氏平衡拱理论,推导了深埋连拱隧道的土压力荷载计算公式,同时结合规范中关于隧道深浅埋分界高度的规定,给出了深浅埋连拱隧道的分界埋深及荷载计算公式,形成了完整的连拱隧道深浅埋情况下的荷载计算体系。通过大量的分析计算并与其他公式对比,验证了推导出的公式的合理性,并将公式应用于湖北沪蓉西高速公路连拱隧道及分岔隧道的设计中,取得了良好的效果。

IN light of the present situation without mature formulations to calculate the loading of multi-arch tunnel for highway in China, the formulation of the earth pressure is derived based on the loading feature of multi-arch tunnel and PU＇S equilibrium arch theories. Considering the division altitude of deep tunnel and shallow tunnel specified in the tunnel code, the division altitude and the loading formulation are proposed. Thus a fully calculation system is formed here. Lots of analyses and calculations validate that the formulation presented is reasonable by comparing with other formulations. Good effects are achieved when applying this formulation in the design of both multi-arch tunnel and bifurcation tunnel for the highway from Shanghai to Chengdu.