山区公路桥梁基桩嵌岩深度计算方法研究

嵌岩桩在山区高速公路建设中应用广泛,具有稳定性高、承载力大等特点,嵌岩深度对嵌岩桩的承载特性起到至关重要的作用。考虑嵌岩段顶部受剪力和弯矩组合作用下,引入Hoek-Brown准则,建立静力平衡方程,得到最小嵌岩深度的计算模型。结合实际工程案例,对比其他计算方法,论证了方法的可行性,对嵌岩桩设计具有一定的参考价值;同时,验证了采用四次多项式拟合岩石破坏面上切应力和法向应力之间的关系式满足精度和误差的要求。

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.