Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (6): 2213-2220.doi: 10.16285/j.rsm.2018.0876

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Analysis for vertical earth pressure transference on overlaying soils of shield tunnel under uniform surface surcharge

HUANG Da-wei1, ZHOU Shun-hua2, FENG Qing-song1, LUO Kun1, LEI Xiao-yan1, XU You-jun3   

  1. 1. Engineering Research Center of Railway Environmental Vibration and Noise of Ministry of Education, East China Jiaotong University, Nanchang, Jiangxi 330013, China; 2. Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai 201804, China; 3. School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China
  • Received:2018-05-17 Online:2019-06-11 Published:2019-06-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51608200, 51478353, 51368020).

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Abstract: Scaled model test for the influence on an existing shield tunnel induced by surface surcharge is carried out, and vertical earth pressure and soil settlement for the stratum above the shield tunnel are analyzed. Results show that under uniform surface surcharge, the less of the vertical distance from the top of the tunnel, the more extent for the nonuniform vertical earth pressure in the stratum above the shield tunnel, and the more extent for the nonuniform soil settlement of overlaying soils of the shield tunnel. The overlaying soils show vertical earth pressure transference for vertical shearing force among soil elements, which is induced by vertical relative movement among soil elements as the stratum above the shield tunnel has nonuniform soil settlement, so the vertical earth pressure in the stratum above the shield tunnel is nonuniform. As vertical shearing force among soil elements for overlaying soils is related to vertical relative movement among soil elements and soil mechanical property, the extent of nonuniform vertical earth pressure in the stratum above the shield tunnel is affected by the extent of nonuniform soil settlement and soil mechanical property of overlaying soils when the tunnel suffers from surface surcharge, so the tunnel deformation is influenced.

Key words: shield tunnel, surface surcharge, additional earth pressure, settlement, convergent deformation

CLC Number: 

  • U25
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