(1. State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;2. Research Center of Geotechnical and Structural Engineering,Shandong University,Jinan,Shandong 250061,China)
Abstract:Based on the evident rheology characteristic of soft rock tunnel in high geostress zone,a new support scheme which adds U-steels compressible stent and foam concretes filling layer to the spray anchor network support is proposed. The long-term stability of Xiakou soft rock tunnel with high geostress in Yichang—Badong expressway is studied by using the new U-steel connector mechanical model and contact model between U-steel and surrounding rock in two support schemes. The results show that:(1) The relationship between the compression and friction resistance for U-steel support is well reflected by the built model consisting of U-steel connector mechanical model and contact model between U-steel and surrounding rock. (2) The combined support of U-steels compressible stent and foam concretes filling layer can absorb rheological deformation of surrounding rocks,which reduces the deformation pressure of the secondary lining; and also,it can provide stable supporting force,which is helpful to keep long-term stability for soft rock tunnel with high geostress.
田洪铭1,陈卫忠1,2,谭贤君1,王 辉1,田 田1. 高地应力软岩隧道合理支护方案研究[J]. 岩石力学与工程学报, 2011, 30(11): 2285-2292.
TIAN Hongming1,CHEN Weizhong1,2,TAN Xianjun1,WANG Hui1,TIAN Tian1. STUDY OF REASONABLE SUPPORT SCHEME FOR SOFT ROCK TUNNEL IN HIGH GEOSTRESS ZONE. , 2011, 30(11): 2285-2292.