›› 2015, Vol. 36 ›› Issue (12): 3531-3540.doi: 10.16285/j.rsm.2015.12.025

• Geotechnical Engineering • Previous Articles     Next Articles

A study on the response of the piers of operating metro viaducts under the excavation-induced unloading condition

ZHANG Zi-xin1, 2, LI Jia-yu1, 2, ZHOU Xiang2, LI Wen-yong3   

  1. 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Shanghai Metro Operation Company Limited, Shanghai 200092, China
  • Received:2015-07-21 Online:2015-12-11 Published:2018-06-14
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 41372276) and Research Programs supported by Shanghai Construction and Traffic Committee (2012).

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Abstract: The foundation pit of Longcao Road Station of Shanghai Metro Line 12 passes through beneath the viaduct of operating Metro Line 3, so that the pier located in the middle of foundation pit needs protection to ensure the safety of Metro Line 3. Based on the project above, the piers response of viaducts due to unloading is analyzed with combination of 3D numerical method, laboratory test and field test. It is shown that the piers in soft soil rises due to unloading, which agrees well with numerical estimation. The horizontal displacement of piers develops toward the unloading side with significant fluctuations during the process, and the final deformation is consistent with numerical simulation. Unloading leads to a slight loss of ultimate bearing capacity of piles, but it does not threaten the safety of viaduct. Upheaval of piers recovers partly under semi-surrounding unloading condition, and it does not recover under surrounding unloading condition.

Key words: excavations, surrounding unloading, metro viaducts, pier response, foundation piles

CLC Number: 

  • TU 473
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