Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (8): 2785-2795.doi: 10.16285/j.rsm.2019.1504

• Geotechnical Engineering • Previous Articles     Next Articles

3D seismic displacement analysis method of stepped slopes reinforced with piles based on Newmark principle

LI Jian-fei1, SU Yang1, SUN Zhi-bin2, ZHAO Chen1   

  1. 1. Shanghai Engineering Section, China Railway Shanghai Group Co., Ltd., Shanghai 200071, China; 2. School of Automotive and Transportation Engineering, Hefei University of Technology, Hefei, Anhui 230009, China
  • Received:2019-09-02 Revised:2019-12-23 Online:2020-08-14 Published:2020-10-18

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Abstract: Based on Newmark principle, a 3D seismic displacement method of stepped slopes reinforced with piles is proposed. Firstly, based on the limit analysis, the explicit expression for the yield acceleration parameter of stepped slopes reinforced with piles is derived through the horn failure mechanism. Then the influence of different factors on is investigated through parameter analysis. The results show that multi-step slopes are safer than single-step slopes. In addition, the formula of angular velocity is derived by means of the principle of moment balance, and the angular displacement within the time of earthquake action is obtained through the quadratic integral of the angular velocity. Combined with the engineering practice, the influence of earthquake on the 3D seismic stability of stepped slopes reinforced with piles is investigated, and the corresponding engineering suggestions are also given. Finally, the sensibilities of the factors influencing on the stability of slope are analyzed, and the reference is provided for the seismic design of 3D stepped slopes reinforced with piles.

Key words: 3D stepped slopes, limit analysis, Newmark sliding-block method, seismic displacement, sensitivity analysis

CLC Number: 

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