ON-SITE SUPERVISION MEASURE AND THE STRUCTURAL FORCE ANALYSIS OF SHALLOW MULTI-ARCH TUNNEL UNDER COMPLICATED GEOLOGICAL CONDITIONS

According to the complexity in the construction of shallow-buried bias multi-arch tunnel and the actual situation of Dazhongshan1# tunnel, setting testing component in typical cross-sections, the tunnel's surrounding rock and supporting structure force are duly monitored.comparing with the result about software MIDAS analyzed force of the mid-board can be drawn the characteristics of force and deformation when the tunnel under unsymmetrical pressure. the result concluded that toreduce unbalanced force make a important role anduse twoanalytical methods can precisely analysis the stability of structure and effciently guide construction.