Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (2): 612-623.doi: 10.16285/j.rsm.2019.5035

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Design and numerical analyses of high-fill slope strengthened by frame with prestressed anchor-plates

ZHU Yan-peng1, 2, TAO Jun1, 2, YANG Xiao-hui1, 2, PENG Jun-guo1, 2, WU Qiang1, 2   

  1. 1. Key Laboratory of Disaster Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, Gansu 730050, China 2. Western Center of Disaster Mitigation in Civil Engineering, Ministry of Education, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
  • Online:2020-02-27 Published:2020-09-27
  • About author:ZHU Yan-peng, male, born in 1960, Master, Professor, mainly engaged in the teaching and research of retaining structure, ground treatment, engineering accident analysis and treatment.
  • Supported by:
    This work was supported by the Major Special Science and Technology Project of Gansu Province (1302FKDA030) and the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (IRT_17R51).

Abstract: Plenty of high-fill slopes need to be strengthened in engineering projects in the mountainous area of the northwestern district of China with complex geological conditions. To provide sufficient anchoring force to fill slopes and to ensure their stabilities, we put forward a new structure of safety, stability, economy and convenience, named frame with prestressed anchor-plates, which suits for reinforcing the slopes with large fill, and whose reinforcement effect is great. Based on the limit equilibrium theory, we proposed the formula for pull-out resistance and the checking calculation method for the stability. Finite element analysis software PLAXIS 3D was applied to compare and verify the results of the proposed method. The displacement of the slope and the internal forces of a column in the frame are further analyzed, which explains the rationality of the results of numerical simulation, and proves that the frame with prestressed anchor-plates is effective for strengthening the slope and limiting the displacement by comparing with the displacement data of a slope project. By analyzing the variation of axial force and frictional strength during the process of construction, the working mechanism between the plates and the soil is exposed, and the influence of the prestress on the structure is explored. The analysis results can guide the design of high-fill slopes strengthened by the frame with prestressed anchor-plates.

Key words: high-fill slope, ultimate pull-out resistance, stability, a new supporting and retaining structure, PLAXIS 3D