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研究桩与岩石的侧摩阻力组成及影响因素,有助于准确地把握桩与岩石的侧摩阻力取值原则。在对桩与岩层的摩擦黏着机制分析的基础上,指出界面力与岩层抗剪力的区别,并提出岩层的极限侧摩阻力由界面强度及岩石强度两者较弱一方决定的观点。进行了中风化岩中4组混凝土短桩的抗压及抗拔极限摩阻力对比试验,获得了相应的极限侧摩阻力值以及抗拔与抗压极限侧摩阻力值的比值。抗拔时由于上部岩层对桩侧岩层的约束作用较弱,会使侧摩阻力相对抗压时有较大降低。通过有限元计算及其与试验值的比较分析,研究短桩与岩层的界面强度条件,发现岩层和混凝土灌注桩间的侧摩阻力中界面黏着力占很大比例。
Studying the composition and influencing factors of lateral friction of pile and rock helps to accurately grasp the principle of lateral frictional resistance of pile and rock. Based on the analysis of the friction and adhesion mechanism of the pile and the rock, the difference between the interface force and the shear resistance of the rock is pointed out, and the view that the ultimate friction of the rock is determined by the weaker one of the interface strength and the rock strength is proposed. Comparing the compressive resistance and ultimate tensile resistance of four groups of concrete short piles in the aeolian rock, the corresponding ultimate lateral frictional resistance and the ratio of the resistance to compression and extreme lateral frictional resistance were obtained. Due to the restraining effect of the upper rock layer on the pile side rock formation during the anti-pull, the lateral frictional resistance will be greatly reduced when the relative compressive stress is applied. Through the finite element analysis and comparative analysis with experimental values, the interface strength conditions of short piles and rock strata are studied. It is found that there is a large proportion of interfacial adhesion in the side friction between rock piles and concrete piles.