以鱼嘴长江大桥南北锚碇2种工况下的混凝土与基岩接触面原位直剪试验为背景，结合工程地质特性，对较高强度混凝土与坚硬基岩接触面抗剪强度的影响因素进行了全面分析。认为： ①对于较高强度混凝土及坚硬基岩而言，混凝土强度的提高对接触面摩擦系数f的提高贡献不明显，主要贡献在提高粘接力c值；在控制好混凝土质量及建基面岩体质量的前提下，确保混凝土与建基面间的浇筑质量更显关键。②水使接触面抗剪强度略有降低，但影响程度有限；混凝土与基岩接触面在高水头、长时间水浸泡状态下抗剪强度参数的降低程度有待更深入地研究。③较高强度混凝土与坚硬基岩接触面的剪切破坏都呈典型的脆性破坏特征。

Based on insite anchor shear tests under natural condition and saturated condition on Changjiang Bridge at Yuzui, Chongqing and the engineering geology, a comprehensive analysis on the influencing factors of shear strength on the contact surface between higher strength concrete and hard bedrock is presented in this paper. The analysis demonstrated that firstly as for the higher strength concrete and hard bedrock, the increasing of concrete strength has slight impact on friction-coefficient (f) on the contact surface, while remarkably helps the increase of cohesive strength (c) .In this sense, it is critical to ensure the quality of pouring on the contact surface between concrete and bedrock. Secondly, the shear strength is reduced slightly by the impact of water, which is quite limited；and the decrease of shear strength under high water head and long time immersing needs to be studied indepth. Moreover, the shear destruction on the contact surface between high strength concrete and bedrock has the characteristics of typical brittle-racture.