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Experimental Study on the Mechanical Characteristics of the Xujiachuan Loess Tunnel on the Baoji—Lanzhou PDL
(1 Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou 730070; 2 School of Civil Engineering,Lanzhou Jiaotong University, Lanzhou 730070; 3 JSTI Group, Nanjing 210000; 4 China Railway First Survey & Design Institute Group Co. Ltd., Xi′an 710043)
Abstract The Xujiachuan loess tunnel on the Baoji-Lanzhou PDL was constructed by the three-bench and sev? en-step assembly-line construction method, and being characterized by its large deformation of surrounding rock, it was very difficult to construct. In this paper, the time-dependent change rules and distribution tendencies of the surrounding rock pressure, steel arch stress, contact pressure between the primary lining and secondary lining, and the xial force of the secondary lining reinforcement and concrete strain are studied by in- situ monitoring measurements and the safety of practical engineering is assessed. The general rule and characteristics of the tunnel’ s construction are concluded through in-situ monitoring measurements and data analysis, which can provide a reference for the construction of similar loess tunnels in the future.
Abstract：
The Xujiachuan loess tunnel on the Baoji-Lanzhou PDL was constructed by the three-bench and sev? en-step assembly-line construction method, and being characterized by its large deformation of surrounding rock, it was very difficult to construct. In this paper, the time-dependent change rules and distribution tendencies of the surrounding rock pressure, steel arch stress, contact pressure between the primary lining and secondary lining, and the xial force of the secondary lining reinforcement and concrete strain are studied by in- situ monitoring measurements and the safety of practical engineering is assessed. The general rule and characteristics of the tunnel’ s construction are concluded through in-situ monitoring measurements and data analysis, which can provide a reference for the construction of similar loess tunnels in the future.
ZHANG Tang-Jie- 1,
2 ,
3 Liang-Qing-Guo- 1 etc
.Experimental Study on the Mechanical Characteristics of the Xujiachuan Loess Tunnel on the Baoji—Lanzhou PDL[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(5): 85-91
2016, Vol. 53 