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《Chinese Journal of Underground Space and Engineering》 2014-05
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Mechanical Characteristics and Safety Analysis of Initial Support in Large Section Shallow Loess Tunnel

Li Zhiqing;Ding Chunlin;Wang Keyuan;Wu Xuping;Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University;The Fifth Construction Engineering Company,China Railway 25th Bureau Group Co. ,Ltd.;Zhejiang Provincial Plan Design and Research Institute of Communications;  
Taking the three-micro bench seven-step method for excavation of Xinzhou tunnel on Datong-Xi'an passenger Railway line as the engineering background,the mechanical characteristics of initial support is analyzed by using numerical simulation of FLAC3 D,the result is compared with axial force of rock bolts and the stress of shotcrete from site measurement. The bearing capacity of shape steel reinforced shotcrete is calculated and its safety performance is evaluated. The research result shows that: 1the stress of shotcrete is mainly compressive and it is distributed in axial symmetry; the maximum compressive stress exists in haunch,and the stress in arch springing is tensile,so the arch springing is the weak part in construction; the result of site measurement is less than that of numerical calculation and the distribution of them is much similar; 2the axial force of rock bolts is mainly tensile,and the maximum tension appears at 1 meter of the rock bolts; it decreases from crown to arch springing; the result of numerical calculation is less than that of the site measurement,but the distribution rule of them is the same; 3the safety factor of shape steel reinforced shotcrete increases from crown to arch springing and the safety factor of axial force is less than that of bending moment in the same part; the minimum safety factor of axial force is 3. 86 and conforms to the code requirement,so the distance of steel arch can be increased or the strength of shotcrete can be decreased appropriately.
【CateGory Index】: U455.7
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