Abstract：The load transfer characteristics of rock-socketed pile are mainly decided by the shear behavior of rock-concrete interface. Based on the dilatancy and failure mechanisms of the interface between pile-rock and surrounding rock，a new load transfer function of skin friction suitable for the weak rock-socketed piles is set up；analytical solutions for the friction and axial force of single pile are obtained under the conditions of failure and elasticity of the surrounding rock；and the analytical solution of critical pile length is obtained as well. On the basis of those，the distributions of frictional resistance and axial force along the pile length are discussed，which can explain theoretically that the diameter of pile，pile-rock modulus ratio and dilatancy angle influence the load transfer characteristics of rock-socketed piles；and some useful suggestions for rock-socketed pile design are also proposed. Moreover，an influential parameter h，which is used as macro-control guideline of rock-socketed pile bearing performance，is introduced to consider the comprehensive influential effect of various factors approximately. From analysis，it is found that，under the same condition，the higher the value of h is，the better the rock-socketed pile bearing performance is，and the bigger the pile ultimate load can sustain. Comparative analysis result of an engineering example shows that the values calculated by the presented method agree well with the measured data.
