›› 2017, Vol. 38 ›› Issue (3): 833-839.doi: 10.16285/j.rsm.2017.03.028

• Geotechnical Engineering • Previous Articles     Next Articles

Upper bound analysis of basal stability of excavations based on continuous velocity fields

TANG Zhen1, 2, HUANG Mao-song1, 2, YUAN Ju-yun1, 2   

  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
  • Received:2015-04-17 Online:2017-03-11 Published:2018-06-05
  • Supported by:

    This work was supported by the National Key Research and Development Program (2016YFC0800202) and the National Fund for Distinguished Young Scholars of China (50825803).

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Abstract: The deformation mechanism of the foundation pit is not consistent with the real in-situ deformation in traditional method for stability analysis. The surface settlement curve caused by foundation pit excavation in soft soil area enables the establishment of the admissible velocity field and deformation mechanism for basal stability problems in excavations. The soil inside the deformation mechanism acts as a continuous deformation body without apparent failure surface at the boundary. A new method for the stability analysis of foundation pit is developed based on upper bound method. The deformation mechanism adopted in the method is more suitable for the foundation pit deformation, considering the influence of the depth of supporting structure on the uplift deformation of foundation pit. The upper bound method based on Terzaghi mechanism and Prandtl mechanism is compared with the multi-block upper bound method in engineering examples to verify its rationality and applicability.

Key words: basal stability of excavation, upper bound method, deformation mechanism, continuous velocity field

CLC Number: 

  • TU 473

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