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Abstract Based on the calculating pattern of pulling prestressed anchorage body out from the base，the anchorage section can be divided into elastic region，plastic slide region and debonding region after analyzing the deformation and the damage process of the interface layer between anchorage body and grouting material，and the interfacial layer model for anchorage body and rock and soil mass is established. The theoretical solution of interfacial stress distribution was deduced by adopting the flow rule which associates with Coulomb condition. At the same time，a kind of new interface element model with properties of dilatancy and slippage is constructed；and interfacial stress distribution is calculated by two ways of numerical simulation and theoretical solution to verify the correctness of each other，so as to provide a new theoretical basis to calculate，analyze and design anchorage bodies. The results indicate that the main mechanical region is plastic slide region. So the plastic slippage state is the main state which the anchorage body usually in，so our researching and designing should be based on this state. In order to improve the anchoring force，we should improve maximum shear stress and extend the range of slip regime before the slip regime entering the debonding state.
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Received: 06 September 2012
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2013, Vol. 32 
