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《Chinese Journal of Underground Space and Engineering》 2012-01
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Stability Analysis of Loess Tunnel Entrance Section Considering the Impact of Vertical Joints

Wang Tiehang1,Wang Juanjuan1,Fang Jiangfeng2(1.College of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China; 2.China Nuclear Power Design Company.Ltd,Shenzhen Guangdong 518029,China)  
This paper mainly focuses on the stability analysis of the loess tunnel entrance section by numerical analysis method with the factor including the different vertical joints position and numbers,upper soil thickness and body water content of the tunnel entrance section.The results show that within the span of tunnel entrance,the joint has little effect on the vault settlement when it is at the middle of the vault;but the more joints deviate from the middle,the greater the vault settlement happens.When the joints develop at one side departing from the midline of the tunnel entrance arch,both the relative shear stress level and the area of plastic zone size of this side is greater than the other side,showing that the joints have adverse effect to the tunnel entrance section.When the joints occur on both sides of the arch,the plastic zone develops rapidly through the joints,and the central soil of the roof is cut by joints totally to form a dangerous landslide.
【Fund】: 教育部博士点基金(20096120110006)
【CateGory Index】: U452.11
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