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选取钱江通道及接线工程新湾互通3组桩基进行桩侧摩阻力发挥情况的现场监测。第1组桩基采用静载试验方式加载。第2组和第3组桩基通过上部结构施工加载,其中第2组桩基上部结构施工方法为节段挂篮现浇,第3组桩基上部结构施工方法为整体支架现浇。各组桩基受荷过程中桩身轴力逐步增大,桩侧土摩阻力发挥程度也逐渐加大。静置时间不等的第1组和第3组桩基粉土层摩阻力测试值不等,静置时间长的第3组桩基的粉土层摩阻力测试值大于第1组桩基的粉土层摩阻力测试值。分级受荷的第1组和第2组桩基,第2组桩基各级荷载施加的时间间隔较长,在施加的荷载量级相当时,第2组桩基粉土层、粉砂层摩阻力测试值大于第1组桩基粉土层、粉砂层摩阻力测试值。
The 3 groups of pile foundations in the Qianwan Interchange of the Qianjiang Channel and the connection project were chosen to carry out on-site monitoring of frictional performance of the pile. Pile group 1 is loaded by static load test. The second group and the third group of pile foundation through the superstructure construction loading, in which the second group of pile foundation structure construction method is segmental basket pouring, the first group of pile foundation structure construction method for the whole stent casting. During the course of pile loading, the axial force of the pile body gradually increases and the friction resistance of the pile side soil increases gradually. The test values of frictional resistance of pile silt layers in group 1 and group 3 with different standing time ranged from that in group 3, Silt resistance test value. The first group and second group of piles under load were graded. The load applied at each level of piles in group 2 had a longer time interval. When the applied load was equivalent, the second group of piles of silt layer, silt layer The frictional resistance test value is greater than the first group pile soil silt layer, silt layer friction resistance test value.