Study on Construction Design and Excavation Stability of Mountain Tunnel
Aiming at the problem of unfavorable geological treatment and excavation stability in the construction of expressway mountain tunnel project,this paper takes the Yangjiashan Tunnel on the main line of Keyan Interchange in Shaoxing as an example to illustrate the treatment measures for unfavorable geological conditions in the mountain tunnel project,and establishes a two-dimensional finite element model midas GTS NX according to the actual engineering situation,analyzes the stability of the tunnel during the excavation process,and gives the stress and deformation nephogram of each construction stage.The results show that the construction of Yangjias-han Tunnel has little influence on the deformation of surrounding rock and the internal force of tunnel lining structure after adopting ap-propriate construction organization design;For the unsymmetrical pressure tunnel,the deformation and internal force of the tunnel struc-ture at the unsymmetrical pressure side have increased to a certain extent,which requires special attention;In view of potential collapse hazards,timely construction of advance support and lining and strengthening of geological advance warning can greatly improve the safety of excavation.
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