Abstract:

In order to protect the slope and the natural environment alongside mountain in highway, three-centered circular arch with oblique slant steel pillars support system was constructed. Cut and cover method, tunneling method, arch protection and other excavation methods were taken according to different depths, so it can protect the ecological environment and maintain the stability of the  slopes. Numerical simulations analysis of plane strain at the most disadvantageous position indicated that  three-centered circular arch with oblique slant steel pillars support system with the principal tensile stress of 1.44 MPa, principal compressive stress of 3.24 MPa and displacement of 2.1 mm, was rational on the seasonal frozen region weather conditions, accorded with norm requirements in safety. The structural style of shed-tunnel and measures of waterproof and drainage was designed, which fit for the seasonal frozen region. It supplied experience for highway construction alongside mountain in the seasonal frozen region, fully embody building concepts of disaster prevention and environmental protection.

Key words: seasonal frozen region, shed tunnel structure, construction industry, numerical simulation