Study of Surrounding Rock´s Stability Based on Monitoring Measurement of Highway Tunnel

In allusion to some highway tunnels, which have many characters such as complex geologic environment, developed crack and joint of terrane, high degree of weathering, water-rich, large deformation of surrounding rock, and short self-stability time etc.. During construction stage of highway tunnels, based on varied monitoring measures which include perimeteral convergence, crown displacement, stress along bolt, ground subsidence, internal and eternal force of parapet grille, inner displacement of surrounding rock, internal and eternal force of secondary lining etc, and the ground penetrating radar advance forecasting, work out its deformation orderliness, acquire exact criterion of stability of surrounding rock, as well as alter design, adjust supporting parameters and construction technique in time, so insure the tunnel construction´s safety and economy. Aiming at the sandstone and flowing carbonaceous mudstone, gives the surrounding rock´s deformation and internal force of parapet grille characters, stable condition and critical criterion on condition that the preliminary supporting was done. The monitoring measurement results have referenced value to the similar tunnels.