1.School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China
2.Laboratory of Building Structural Retrofitting and Underground Space Engineering (Shandong Jianzhu University), Ministry of Education, Jinan 250101, China
Objective The uplift capacity and safety stability of anchor plates are significantly influenced by factors such as terrain relief, installation methods, and seismic loads during the service phase. This study seeks to derive analytical expressions for the uplift capacity of anchor plates under seismic action, along with the corresponding soil failure curve, to address the problem of the uplift capacity of shallow-buried inclined anchor plates in sloping strata located in high-intensity seismic zones. It further aims to clarify the influence patterns of anchor plate design parameters, soil properties, and seismic forces on the uplift capacity and the extent of soil failure. The research provides theoretical references for the design and construction of strip anchor plate foundations in high-intensity seismic regions, helping to optimize anchor plate design and enhance their safety and stability under seismic loading. Methods This study constructed a kinematically admissible velocity field that represented the failure mechanism of the soil mass above the anchor plate. Based on the plastic upper-bound theorem and the pseudo-static method, and incorporating the nonlinear Mohr-Coulomb strength criterion, analytical expressions for the seismic uplift capacity of the anchor plate and the geometry of the soil failure curve were theoretically derived. This methodology integrated the effects of seismic forces simulated via the pseudo-static approach and the nonlinear shear strength characteristics of the soil. A two-stage validation process was employed to verify the correctness and reliability of the proposed theoretical method. First, a parameter degradation analysis was conducted. The computational results of this method were compared to the existing theoretical solutions proposed by Murray et al. through simplifying specific parameters in the derived formulas. The results showed a high degree of consistency in both variation trends and numerical magnitude. Second, further validation was performed through numerical modeling. Twelve sets of numerical simulations under three different working conditions were conducted. The results obtained from these simulations demonstrated a high level of agreement with the theoretical analytical solutions derived in this study, fully confirming the correctness and reliability of the proposed theoretical method. Conclusions Based on the results, the pullout capacity of the anchor plate is directly proportional to the embedment depth-to-width ratio, initial cohesion, soil unit weight, and ground surface load, whereas it is inversely proportional to the inclination of the anchor plate, surface inclination, nonlinear coefficient, and seismic load. The soil failure range is positively correlated with the seismic load and initial cohesion, whereas it is negatively correlated with the nonlinear coefficient, soil unit weight, ground surface load, surface indination, and the inclination of the anchor plate. This study successfully derives theoretical solutions for the seismic uplift capacity and failure mechanism of shallow-buried inclined anchor plates in sloping ground. The validity of these solutions is rigorously confirmed through comparison to existing theories and extensive numerical simulations. The research outcomes provide a valuable theoretical basis for the design and construction of strip anchor plate foundations in high-intensity seismic areas, contributing to the optimization of anchor plate design and the enhancement of seismic safety and stability.
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