H型预应力混凝土护岸桩现场试验研究

Research on Field Test of H-type Prestressed Concrete Revetment Piles

为研究H型预应力混凝土护岸桩在内河航道中的适用性,结合湖嘉申线二期航道改建工程,开展了现场试验,对桩土界面处土压力以及桩体内部应力应变进行监测。监测结果表明:背水侧土体的位移受到老护岸和上部荷载的约束,土体被挤得更密实,水平土压力较大;而临水侧是河流且接近河流中轴线,水平土压力较小,最终水平土压力系数在1.1~1.2左右;桩体内部应力大于该型号H型护岸桩的混凝土有效预压应力,沉桩后各测点压应变减小。基于试验结果,对H型护岸桩土压力的计算方法进行了优化,使其更接近于实测值。

In order to study the applicability of H-type prestressed concrete revetment piles in inland waterways,field tests were carried out to monitor the soil pressure at the pile-soil interface and the internal stress-strain of the piles in conjunction with the second phase of the waterway reconstruction project of the Hujia-Shen Line.The monitoring results show that:the displacement of the soil body on the backwater side is restrained by the old revetment and the upper load and the soil body is squeezed more compactly and the horizontal soil pressure is larger;while the waterfront side is the river and close to the river axis and the horizontal soil pressure is smaller and the final horizontal soil pressure coefficient is around 1.1~1.2;the internal stress of the pile body is larger than the effective precompressive stress of the concrete of this type of H-type revetment pile,and the compressive strain at each measurement point decreases after sinking the pile.Based on the test results,the calculation method of soil pressure of H-type revetment pile was optimized to make it closer to the measured value.