基于桩侧阻力强化效应的嵌岩桩承载力计算

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Abstract Based on the shear mechanical properties of structural plane under condition of constant normal stiffness，the load transfer mechanism of rock-socketed pile was studied. Considering the bond strength of pile-rock interface，a complete shear mechanism of pile-rock interface of rock-socketed pile was proposed，including bond damage，sliding dilatancy and shear slipping. According to the mechanical properties of pile-rock interface in different shear stages，complete shear constitutive equations for pile-rock interface were put forward. On the basis of shear mechanical properties of pile-rock interface，the enhanced effect of skin friction was analyzed theoretically. The results show that the enhanced effect occurs at the whole pile side and is the most distinct in the vicinity of pile tip. Considering the enhanced effect of skin friction，the theoretical formula for vertical bearing capacity of rock-socketed pile was proposed，which is obviously different from the traditional method suggested by specifications. Comparative analysis of case study shows that the vertical bearing capacity calculated by the proposed method is much closer to the field static load test result than the value calculated by the specifications. It provides a new procedure for design and application of rock-socketed piles.

Key words： pile foundations rock-socketed piles enhanced effect pile-rock interface bearing capacity skin friction

Received: 22 March 2012

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http://www.rockmech.org/EN/Y2013/V32/Is1/2925

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