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| Research on the Seismic Responses for Shield Tunnel in Liquefiable Soil |
| ZHOU Jun1，WU Wei-lin1，HU Rui-qing2 |
| (1.China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China； 2.Southwest Jiaotong University, Chengdu, Sichuan 610031, China) |
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Abstract Abstract：Research purposes： In this paper, taking Foshan Metro Line 2 shield project as an example, the undisturbed soil and calculation parameters of soil reinforcement are obtained through field sampling of sand and dynamic triaxial test, which are calculated and analyzed using finite element analysis software ANSYS, the dynamic response and the formation of liquefiable sand soil layer are quantified and evaluated in shield tunnel under horizontal seismic wave excitation the damping effect of reinforcement. Research conclusions：(1) In the transverse seismic loading, strata and structural seismic response and seismic wave peak value is not synchronized in time, and the formation and development of the seismic response of the structure are different, the first principal stress maximum value of the lining is 1.69 MPa. (2) After taking the reinforcement measures of tunnel surrounding strata, the greater the stratum strength parameters is, the greater the decline of segment displacement is, and the greater the amplitude of principal stress increase (decrease) is, which can meet the operational requirements and strength of tunnel. (3) Considering the influence of shield tunneling process on adjacent buildings, it is suggested that the reinforcement of sand soil layer be reinforced with 400 kg superfine cement per cubic meter. （4） The research results can be applied to the seismic design and selection of reinforcement measures for the shield tunnel in liquefiable sand soil.
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Received: 13 November 2017
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2017, Vol. 34 
