Research On The Effect Of Support Measures On The Stability Of Loess Tunnel

In loess tunnel construction process, as a special kind of loess soil, the key is to ensure the stability of surrounding rocks in the process of tunnel excavation, the stability of surrounding rock mainly get through reinforcement measures in the construction to guarantee. Using different surrounding rock reinforcement measures will be the stability of surrounding rock to produce different effect and influence. Chooseing the right and effective of the surrounding rock reinforcement measures has important significance for the construction of the loess tunnel.This paper is based on the western sanxi highway hanguguan loess tunnel as the research object, the universal finite element method is based on large ABAQUS software platform,and combined with the engineering practice, this paper analyzes the surrounding rock reinforcement measures in the loess tunnel construction of the application,and study reinforcement measures impact the stability of surrounding rock, In the paper the content of study and the conclusions are as follows:(1)Getting the relationship between the length of pipe-shed and the buried depth of soil according to the characteristics of pipe-shed construction.(2)By researching the simulation analysis system anchor rod in different locations of the tunnel effect, the results show that in the control of the dome for surrounding rock mass deformation obviously, arch waist place of the anchor has certain effect, and the arch feet does not play a signifieant role.(3)Calculating and analyzing the action range of inverted arch according to its construction characteristics,and getting the actual action range of inverted arch in loes-s tunnelby. ANSYS.(4)Choosing several typical methods from many different tunnel excavation methods to simulate and analyse the application objects,and get the reasonable loess tunnel excavation method is the center diagram method.(5)Making data measured in practical application for reference, comparatively analyzing the actual project and most effective surrounding rock reinforcing means,and getting the conclusion that the new reinforcing means that are the organic combinations of these reinforcing means mentioned before whether suit loess tunnel.