94 Theoretical Analysis and Application of Pile Shaft Resistance Strengthening Effect Available to Purchase

Based on the view of distribution laws of internal forces of pile and internal forces keep in a balance between rock-socketed pile and pile rock interface, pile shaft resistance strengthening effect — rock-socketed pile shaft resistance increased with the increasing of pile tip rock uniaxial compressive strength or elastic modulus and load at pile top was analyzed; mathematical expression of quantitative indicators of pile shaft resistance strengthening effect was established, including pile shaft resistance strengthening coefficient to pile shaft rock internal friction angel, uniaxial compressive strength or elastic modulus and load at pile top; The concept of the expression was clear, easy to use and consistent with the relevant experimental results. With engineering examples, we proposed that rock-socketed pile shaft resistance strengthening effect should be considered in calculating ultimate bearing capacity of single pile to reduce the depth of rock-socketed and save construction investment during the period of designing.