Research on the deformation and stability of weak surrounding rock mass in the Qingshanchong double-arch tunnel

Depending on the Qingshanchong double-arch tunnel in Huaixin expressway,the method of geological investigation,spot monitoring and the finite element analysis were used to explore the deformation and characteristic of the stresses variation where the double-arch tunnel construction process pass through the zone of weak surrounding rock mass.With the help of displacement measurement,stress and strain measurement and so on,a variety of information in the construction process of double-arch tunnel was back analyzed to validate the simulations,modify the design and instruct the construction according to the results of analysis.