Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (6): 1811-1825.doi: 10.16285/j.rsm.2022.5995

Previous Articles     Next Articles

Three-dimensional unified mechanical model and calculation method of uplift capacity of horizontal rectangular anchor plate in the whole region in sand

HU Wei1, 2, WANG Hui1, 2, YAO Chen3, HAO Dong-xue4, SHI Dan-da5   

  1. 1. Hunan Province Key Laboratory of Geotechnical Engineering Stability Control and Health Monitoring, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China

    2. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China

    3. China Railway Major Bridge Reconnaissance & Design Institute Co., Ltd. Chongqing Branch, Chongqing 400020, China

    4. School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin, Jilin 132012, China

    5. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China

  • Online:2023-06-20 Published:2023-09-12
  • About author:HU Wei, male, born in 1982, PhD, Professor, PhD supervisor, research interests: ground and foundation engineering.
  • Supported by:
    the National Natural Science Foundation of China (52178332, 52078108).

Abstract: Uplift of the horizontal rectangular anchor plate is a typical three-dimensional problem. However, it is difficult to characterize the sliding surface of soil around the anchor plate in the limit state for its shape is affected by a combination of the length-width ratio and embedment ratio of the anchor plate. Combining the results of ABAQUS 3D numerical simulation and 2D sliding surface analysis, it is found that the geometric form of the 3D sliding surface in any horizontal section within its buried depth range can be described by a closed graph, including four segments of straight lines parallel and equal to the long and short sides of the anchor plate respectively and four segments of 1/4 arc. The horizontal distance between the straight line and the corresponding anchor edge is determined by the 2D sliding surface in the vertical symmetric plane in the center of the long edge. The shape of this 2D sliding surface depends only on the embedment ratio, and it can be characterized by the logarithmic spiral morphological function. Based on these understandings, a three-dimensional mechanical analysis model of uplift bearing capacity of the horizontal rectangular anchor plate was constructed for the first time, and four cases of the model were analyzed. Combining the decomposition and merging of the model, the mechanical limit equilibrium analysis of the isolation body was carried out. Then, the calculation method of uplift bearing capacity of the horizontal rectangular anchor plate was deduced. It is applicable in the whole range of the length-width ratio and embedment ratio. Compared with five test cases and three other calculation methods, the results show that the proposed method has the best performance in all kinds of sand ground with various relative densities, which shows good applicability.

Key words: rectangular anchor plate, vertical pullout, sliding surface, mechanical model, bearing capacity