中文摘要：

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问的侧摩阻力中界面黏着力占很大比例。

英文摘要：

To determine the side rock resistance of pile more accurately, the composing and the influence factor of it need to be researched. The mechanism of friction and adhesion between pile and rock is analyzed. It is pointed out that pile-rock interface strength is different from rock shearing resistance; the ultimate side rock resistance of pile is determined by the weak one between pile-rock interface strength and rock strength. Four groups of compression and uplift comparative tests for concrete short piles in medium weathered rock are accomplished. The value of ultimate side rock resistance and the resistance ratio of uplift test and compression test are obtained. Because the upper rock restriction to the rock connected with pile is weaker in uplift test than in compression test; the side rock resistance in uplift test decreases distinctly comparing with the result of compression test. ADINA software is used to analyze the test piles. By comparing the calculated value of ADINA program with the test value, the interface strength condition of pile and rock is analyzed. It is discovered that the ultimate side rock resistance of test pile is determined by the pile-rock interface strength; and the interface adherence force is the main Dart of interface strength.