Method for rock-socketed depth of highway bridge piles in mountain areas

The rock-socketed pile is widely applied in the construction of highways in mountain areas, which has the characteristics of high stability and large bearing capacity. The rock-socketed depth plays a crucial role in the bearing characteristics of rock-socketed piles. A static equilibrium equation is established to obtain the computational model for the minimum rock-socketed depth in which the Hoek-Brown criterion is introduced, and it takes the combination of shear force and bending moment into consideration at the top of rock-socketed section. The feasibility of the proposed method is demonstrated in comparison with other methods, and it may have certain reference value to the design of rock-socketed piles. At the same time, the relationship between shear stress and normal stress of the quartic polynomial fitting rocks is verified to meet the requirements of accuracy and error.