Road Double Arch Tunnel Excavation Method And Numerical Simulation Of The Construction Process

In this paper we dissertate the common structure cross forms and excavating methods of highway double-arc tunnel home and abroad at the first part, and study common simulation methods of tunnel construction afterwards. Based on the method of reversing and releasing the stress, and combined with the capacity of simulating continuous construction of ANSYS programme, we come up with the thought of using the method of applying virtual support force to release the stress step by step to realize the step-by-step release of initial stress during the tunnel construction simulation. With the help of design language of ANSYS, we develop a command to apply the virtual support force. Then we simulate the common excavating methods of double-arc tunnel respectively, analyze the stress and strain of wall rock and support structure of each method, and recommend the best excavating method to construct double-arc tunnel in wall rocks of II .Then we analyze the "three headings method" in detail, and also simulate the effect of construction factor, stress releasing coefficient and secondary lining. Then we carry out plane elastoplastic simulation of double-arc tunnel, and get the development regularity of plastic region. Finally we set up three-dimensional space model to simulate the space effect during tunnel construction, analyze the transaction between the left runnel and the right tunnel, and also analyze the deformation and stability of mid-partition.We get an ideal method to tunnel construction simulation through proper development of ANSYS programme in this paper. Combined with the experience of engineers, it can benefit and accelerate the design and construction of tunneling projects. The conclusions we draw can also play a directive role in highway double-arc tunnel construction.