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采用减沉复合疏桩进行软基处理能充分发挥桩间土体的承载力,有效控制工后沉降的同时节约了软基处理成本。预应力管桩作为一种常用的减沉复合疏桩,大量应用于目前高速公路桥头软基处理中。其沉降计算多采用复合模量法,无法准确反映路堤荷载下该桩型的承载机理,计算值与实测值存在较大差别。基于Mindlin应力解,得出了环形桩端均布荷载作用在地基内部任意点竖向附加应力系数的数值计算方法;得出了沿桩身三角形分布、沿桩周均匀分布侧摩阻力作用在地基内部时任意点土中竖向附加应力系数的数值计算方法。在此基础上建立了考虑桩身压缩量和实际截面形状的预应力管桩单桩沉降计算方法,进而建立了路堤荷载下预应力管桩复合地基的沉降计算方法。通过现场实测沉降数据验证了该方法的合理性。
Soft sink treatment by using the composite sinking and sinking pile can give full play to the bearing capacity of the soil between the piles and effectively control the settlement after construction while saving the processing cost of the soft foundation. Prestressed pipe pile as a common sinking composite sparse pile, a large number of applications in the current bridgehead soft foundation treatment. The settlement calculation using multi-modulus method, can not accurately reflect the bearing capacity of the pile under the embankment load-bearing mechanism, the calculated value and the measured values are quite different. Based on the Mindlin stress solution, the numerical calculation method of the vertical additional stress coefficient at any point inside the foundation due to the uniformly distributed load acting on the end of the circular pile is obtained. The triangular distribution along the pile body and the uniform lateral frictional resistance along the pile circumference are obtained. Numerical Calculation Method of Vertical Additional Stress Coefficient in Any Point Soil in Interior. On this basis, the settlement calculation method of prestressed pipe pile considering the compression amount and actual cross-sectional shape of the pile body is established, and then the settlement calculation method of prestressed pipe pile composite foundation under the embankment load is established. The measured data from the field show that the method is reasonable.