(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；3. College of Civil Engineering and Architecture，Guilin University of Technology，Guilin，Guangxi 541004，China；4. Guizhou Transportation Planning Survey and Design Academe Co.，Ltd.，Guiyang，Guizhou 550001，China)
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.
黄生根，张晓炜，曹 辉. 后压浆钻孔灌注桩的荷载传递机制研究[J]. 岩土力学，2004，25(2)：251-254.(HUANG Shenggen，ZHANG Xiaowei，CAO Hui. Mechanism study of bored cast-in-place piles with post-grouting technology[J]. Rock and Soil Mechanics，2004，25(2)：251-254.(in Chinese))
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2013, Vol. 32 
