冻土中钢管桩荷载传递函数曲线研究

Study of the Load Transfer Curves of Steel Pipe Piles in Frozen Soil

以室内冻土中钢管桩模型桩静载试验为例,介绍了冻土中钢管桩荷载传递函数的测试过程和计算方法,给出了一定条件下模型钢管桩桩身冻结力荷载传递函数曲线及桩端阻力荷载传递函数曲线,并分析了流变效应对荷载传递的影响.结果表明:模型钢管桩桩侧冻结力荷载传递函数曲线及桩端阻力荷载传递函数曲线其线状大致分别程抛物线及直线;由于流变效应的影响,桩侧冻结应力及端阻应力随时间有不同程度的变化;桩土相对位移和桩端下沉量开始5 h内随时间变化较大,但加载5 h后逐渐向稳定方向发展.其研究结果可为进一步的桩土间的本构关系研究提供参考.

Taking an indoor static test of model piles as an example, the test procedure and calculation method of load transfer curves about steel pipe piles in frozen soil are presented in this paper. In the procedure, under certain conditions, the load transfer curves of adfreezing stresses on a steel pipe pile stem and that of resistance stress on the pile tip and the rheology effects on the load trans- ference are respectively investigated. The findings indicate that, on the whole, the pattern of load transfer curves of adfreezing stress on a steel pipe pile stem and that of resistance stress on the pile tip are parabola and straight line, respectively; Due to the rheology effect, to different extent, adfreezing stress on the pile stem and resistance stress on the pile tip vary with time and relative displacement of pile-soil, respectively, and the settlement of pile tip varies with time tempestuously within 5 hours of loading, and then approximates to stability. The results of this paper are useful for studying the constitutive relation between pile and soil.