连拱隧道设计荷载的确定方法

为了给连拱隧道的设计计算提供理论依据,并为以后扩大修建连拱隧道提供支持,提高中国的连拱隧道设计水平,尽可能地减少连拱隧道中隔墙设计的随意性,基于双塌落拱的假定,即认为隧道松动压力的计算值应在半结构宽度与整个开挖宽度相应的松动压力之间取值,并结合现场监测数据,提出了一种新的连拱隧道的荷载确定方法,建立了深、浅埋连拱隧道荷载模式。最后将该方法应用于云南思小高速公路连拱隧道设计中,取得了良好的经济和社会效益。

Defining Method for Designing Load of Multi-arch Tunnel

In order to provide the theoretical basis and supports for the designing calculation of multi-arch tunnel,enlarge the construction of multi-arch tunnel,improve the construction and design levels of multi-arch tunnel and reduce the random in the mid-board design of multi-arch tunnel,a new load defining method of multi-arch tunnel was put forward based on the two slumping arches assumption and field measured data,which meant that the loosening pressure was defined between the corresponding loosening pressure of half and whole span of multi-arch tunnel.The method contained load mode of shallow-seated and deep-seated multi-arch tunnel and it was applied in the design of multi-arch tunnel of Yunnan Sixiao Freeway,which achieved good economic and social benefit.