深厚软土地基增强型管桩受力性状试验研究

增强型管桩采用离心旋转法制作,并经高温蒸养,在制桩时预埋应变计难以实现,本文研制了一种桩身埋设混凝土应变计的新方法,成功解决了这一难题。通过静载试验研究了深厚软土地基中增强型管桩的荷载传递规律及桩侧摩阻力和桩端阻力的发挥性状,探讨了增强型管桩桩身肋的荷载分担情况。试验结果表明,在竖向荷载作用下,增强型管桩桩身上部的肋比下部的肋先发挥作用,肋对桩侧摩阻力的发挥起到了明显地加强作用。

Analysis Experimental on the Bearing Behavior of Enhanced Pipe Piles in Deep Soft Soils

enhanced pipe piles are made by centrifugal rotation and steam curing under high temperature, so it is very difficult to embed concrete strain gauges during making piles. A new method is used to embed concrete strain gauges in piles. Based on the static loading tests on enhanced pipe piles, the load transferring mechanism of enhanced pipe piles is studied through analysing axial load distribution, behaviors of skin resistance and base resistance of piles, and load sharing of rims of enhanced pipe piles. Experimental results show that when axial load acts on the top of enhanced pipe piles, the upper rims of enhanced pipe piles act on skin resistance of piles before the lower rims do, and the rims of enhanced pipe piles remarkably reinforce skin resistance of piles.