Han Dynasty High-speed Qinling Ii Grew Up Tunnel Surrounding Rock Stability Study

This paper studied the Qinling Ⅱ tunnel in Xi'an-Hanzhong freeway. On the base of introducing the geology background of the Qinling Ⅱ tunnel, this paper analyzed the evolvement characteristic of the area crust, the deep structure characteristic and the earthquake movable characteristic in research area, then discussed movable characteristic of the area rupture, the characteristic of structure stress field joined with one study means: niton test. After analyzed the test data, we can conclude: the rupture movable is east stronger than west. Synthesized above five aspect characteristic, we can know it is lesser influence from rupture movable and more stability that is the Qinling Ⅱ tunnel, and the crust is basically stable.Combining locale study, we could know that the main destructive style of the Qinling Ⅱ tunnel is shear slid and flexible crack. Analyzed the factors which influence the stability of Qinling Ⅱ tunnel wall rock based on analyzed result of the area crust stability. Think that there are five kinds as follows: Hard degree of the rock one, main weak structure the integrality degree, initial stress of country rock, direction resisting and cutting the characteristic, function of the groundwater. Evaluated the stability of Qinling Ⅱ tunnel wall rock through two classification method of wall rock: wall rock judgment method and fuzzy synthesis method. Through compared the two methods and combined with the two methods' virtue, we could conclude the optimized wall rock classification method which was adapt to the Qinling Ⅱ tunnel. Finally, the appraisal result of country rock belongs to basic stability district.