It is need to calculate and check the rock-socketed depth when designing bridge piles.According to the principle of static equilibrium,a simplified calculation model of bridge pile rock-socketed depth was established.Based on Hoek-Brown''s strength criterion,the calculation formula of normal stress and friction of pile side was obtained.And then got the calculation method of rock-socketed depth on the basis of considering horizontal load on the bridge pile.Engineering example calculation shows that the theoretical calculation method of pile rock-socketed depth value method is larger than the specification,the difference between them is around 20％,according to the design of bridge pile more security;By calculating the phoenix two bridge75#～106#,the minimum depth of rock-socketed pile were greater than 0.5,which at least 106# pile embedded granite of 0.776 m,according to this article the results will be 0.8 m pile embedded in rock.In this paper,calculation method can provide a reference for similar engineering design.%桥梁基桩设计时,应对基桩的嵌岩深度进行设计验算.根据静力平衡原理,建立了桥梁基桩嵌岩深度简化计算模型;并基于Hoek-Brown强度准则,推导了桩侧法向应力及侧摩阻力计算公式,据此提出了考虑水平荷载特性的桥梁基桩嵌岩深度计算方法.工程实例计算表明:理论计算方法得到的基桩嵌岩深度值比规范法偏大,二者之间的差别在20％左右,据此设计的桥梁基桩更加安全;经计算发现凤凰二桥75#～106#基桩的最小嵌岩深度均大于0.5,其中106#桩需至少嵌入花岗岩当中0.776 m,可按本文计算结果将基桩嵌入岩层0.8 m.计算方法可以为类似工程设计提供参考.
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