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通过对塑料套管桩复合地基的静载试验并在其周身埋设钢筋应力计,测试塑料套管桩复合地基的荷载传递机制,为以后的塑料套管桩的应用提供一定理论依据。随着荷载的增大,不同深度处桩身轴力均呈现逐渐增大的趋势,但是增加幅度不同,这与土的性质有关。轴力随着深度的加深逐渐减小,塑料套管桩显现出摩擦桩的力学特性并根据理论分析与现场试验对单桩承载力的经验公式进行了修改,并得出侧摩阻力的修正系数为1.30。通过现场堆载试验分析了塑料套管桩的加固效果,得出塑料套管桩软基处理具有可快速堆载,沉降稳定快等优点。
Through the static load test of the composite foundation of the plastic casing pile and the embedding of the reinforcement stress gauge in the whole body, the load transfer mechanism of the plastic casing pile composite foundation is tested, which provides a theoretical basis for the future application of the plastic casing pile. With the increase of load, the axial forces of piles at different depths show a tendency of increasing gradually, but the increasing amplitude is different, which is related to the nature of soil. The axial force decreases with the deepening of the depth. The plastic casing pile shows the mechanical properties of the friction pile. Based on the theoretical analysis and field tests, the empirical formula of the bearing capacity of the pile is modified and the correction coefficient Is 1.30. Through the on-site pile-loading test, the reinforcement effect of plastic casing pile is analyzed, and the conclusion is drawn that the soft casing treatment of plastic casing pile has the advantages of rapid loading, stable settlement and so on.