嵌岩灌注桩的沉渣厚度是影响桩基桩端承载力的重要因素 ,深长大直径水下灌注桩的清孔 ,是施工过程的一个薄弱环节。本文通过某大桥主墩基础桩底周边混凝土的质量问题 ,介绍了问题的分析和处理措施。 The sediment thickness of rock-socketed piles is an important factor that affects the bearing capacity of pile-end. The hole of deep and large diameter underwater piles is a weak link in the construction process. In this paper, the quality problems of the concrete around the bottom of the main pier of a bridge are analyzed, and the problems and the measures to deal with them are introduced.