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软岩具有“非土非岩”的特点,笔者结合某特大桥软岩工程设计实例,对其分别进行了摩擦桩、支承嵌岩桩计算。计算结果认为,按摩擦桩设计更符合软岩嵌岩桩工作原理:当嵌岩深度与桩径的比值大于5时,桩底端阻力可以提供一些作用,但比例不大,应该小于10%;当嵌岩深度与桩径的比值大于10时,桩底端阻力不能发挥作用,可以忽略不计。
Soft rock with “non-soil non-rock ” characteristics, the author combined with a large bridge soft rock engineering design examples, respectively, were friction pile, rock-socketed pile support calculation. The calculation results show that the design of friction pile is more in line with the working principle of soft rock embedded rock pile. When the ratio of embedded rock depth to pile diameter is more than 5, the bottom resistance of pile can provide some effect, but the proportion should not be less than 10%. When the ratio of embedded rock depth to pile diameter is greater than 10, the resistance at the bottom of pile can not play a role and can be neglected.