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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2018  >  18(4): 63-71
LAI Hong-peng, ZHAO Xin, KANG Zuo. Settlement control standard of existing metro line undercrossed by new metro tunnel in loess area[J]. Journal of Traffic and Transportation Engineering, 2018, 18(4): 63-71. doi: 10.19818/j.cnki.1671-1637.2018.04.007
Citation: LAI Hong-peng, ZHAO Xin, KANG Zuo. Settlement control standard of existing metro line undercrossed by new metro tunnel in loess area[J]. Journal of Traffic and Transportation Engineering, 2018, 18(4): 63-71. doi: 10.19818/j.cnki.1671-1637.2018.04.007
shu

Settlement control standard of existing metro line undercrossed by new metro tunnel in loess area

doi: 10.19818/j.cnki.1671-1637.2018.04.007
  • 1.

    School of Highway, Chang'an University

  • 2.

    Xi'an Metro Co., Ltd., Xi'an 710018, Shaanxi, China

  • Received Date: 2018-04-20
  • Publish Date: 2018-08-25
    Abstract
  • Based on the actual condition of metro line 5 undercrossing metro line 2 at close range in Xi'an, China, the safety judgment criteria, normal-use requirement and service status of existing metro line undercrossed by new metro tunnel in the loess area were analyzed, the bending moment, radius of curvature, allowable stress, allowable shear strain and track deformation were taken as the control factors of the settlement of existing metro line, the mechanical model of existing metro line was constructed, the settlement computation formula was deduced, and thesettlement control standard was determined. Analysis result shows the corresponding allowable settlements of the existing metro line are 22.40, 20.85, 48.14, 20.23 and 21.06 mm under the control factors of bending moment, radius of curvature, allowable stress, allowable shear strain and track deformation, respectively, and the empirical allowable settlements of other regional undercrossing projects and the standard allowable settlements of relevant domestic regulations are20 mm. The most unfavorable control factor is the track deformation, and the corresponding allowable settlement is close to the existing relevant allowable settlements, so, it is suggested that the settlement control standard is 20 mm for the existing metro line undercrossed by new metro tunnel in the loess area. The level-to-level administration of settlement control standard of existing metro line is performed, the 100%, 80%and 60%of the settlement control standard are taken as the control value (20 mm), alarm value (16 mm) and warning value (12 mm), respectively, and an early warning system of undercrossed existing metro line is proposed. The safety level of existing metro line undercrossed by new metro line is evaluated, and the corresponding treatment measures are given. When the safety level is ClassⅠand the corresponding settlement is no more than 12 mm, the new metro tunnel should be normally constructed and monitored. When the safety level is Class Ⅱ and the corresponding settlement is (12, 16]mm, strengthening monitoring and real-time feedback should be carried out. When the safety level is Class Ⅲ and the corresponding settlement is (16, 20]mm, the construction should be stopped and the emergency plan should be started. The safety level is Class Ⅳ and the corresponding settlement is more than20 mm, the damage level has reached and the construction is never allowed.

     

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