Application of disturbed state concept for load-transfer modeling of recoverable anchors in layer soils

摘要

As a temporary anchorage technique, recoverable anchors have been widely adopted in excavation supporting and underground mining for their unique economic and social merits. The current study attempts to investigate the load-transfer behavior of recoverable anchors in layer soils. The interaction between soil and grout was characterized by a new developed disturbed state concept (DSC) model, in which the interface normal stress was considered. The good agreement between predictions and experimental results from element pullout tests and interface direct shear tests validated the extensive applicability of the DSC model. A theoretical modeling framework for load-transfer behavior of recoverable anchors in layer soils was proposed based on finite difference method, in which the soil-grout interactions were simulated by the DSC model. 3D finite element (FE) models were developed to simulate the pullout behavior of recoverable anchors. The results obtained from theoretical modeling and FE simulations were discussed in detail. Comparisons with numerical simulations and in-situ test data have led to the validation of the theoretical modeling framework. Finally, parametric studies were presented. Application of this work is to evaluate the pullout capacity of recoverable anchors, which can provide theoretical guidance for the design practice of anchoring engineering.