水泥粉喷桩荷载传递规律的试验研究

通过水泥粉喷桩的现场足尺试验，测试了极体的应力-应变关系，推算出极侧摩阻力、轴力变化曲线。结果表明，荷载沿桩身的传递有一定范围，桩体的变形、应力、侧摩阻力主要集中在临界桩长范围内，而各量变化梯度在浅部较大。桩侧摩阻力的发挥与极土相对位移有关。桩体破坏也发生在浅层，破坏形式为环向拉裂和桩体横向压碎。

Field Study of Load Transfer Behavior of DJMP

Based on the full scale fidd test , the axial strain of the deep jet method pile (DJMP)is measured. From this ,frictional resistance of the pile can be calculated the stress. Results show that the transmission of loads along the pile falls widri a certin range ,thedeformation ,stress and frictional resistance of pile occurr mainly within the effective length of Pile, bu the varyin gradient of every variable is larger at the shallow depth .The frictional resistance depends on the relative desplacement between pile and soil. failure of the pile occurs at the shallow depth ,and the failure patterns are annular tension cracks and/or transversal compressive brittle facture of the pile.