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| Rapid construction of three-lane highway rock-soil mixed tunnel with single-side heading method |
| QIAO Xiong1, NI Weilin1, LUO Weibin2*, LIU Wengao1
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1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China;
2. Gansu Tunnel Engineering Technology Research Center, Gansu Road and Bridge Construction Group Co., Ltd., Lanzhou 730050, Gansu, China |
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Abstract In order to study the rapid construction technology of the single-side heading method, the proposed three-lane highway rock-soil mixed tunnel that in the Dashuidong Village Highway Section in Laizibao Township, Yuzhong County, Lanzhou City, Gansu Province were based on to study the method. The overlying stratum of the tunnel site is the Quaternary Upper Pleistocene aeolian loess(Qeol3), and the underlying bedrock is the precambrian Gaolan Group hornblende schist(AnC-gla). The MIDAS/GTS finite element software was used to compare the single in the sidewall pilot method, the partition wall was optimized for half-width construction. Through two-dimensional numerical simulation, the structural force characteristics and displacement change law of the optimized single sidewall pilot method and the optimized single sidewall pilot method were compared. The results showed that: the force of the supporting structure at each stage under the two construction methods was similar. The final settlement and convergence were also the same; after the optimization of the construction method, the displacement law during the construction process was similar and both it could meet the requirements of construction stability, and the optimized single-wall pilot method had more advantages in terms of construction schedule and economic benefits.
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Received: 08 April 2021
Published: 20 June 2021
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