摘   要：近年来，水泥粉煤灰碎石桩（简称CFG桩）以其低成本、高承载力、方便施工等优势广泛应用于高层住宅建筑中。但CFG桩在基坑开挖过程中，如开挖方法不当会造成桩身断裂等情况，直接影响成桩的质量和施工进度。本文结合某高层建筑CFG桩复合地基基坑开挖过程中产生的断桩情况，分析了在基坑开挖过程中影响桩体断裂的不确定因素和基坑开挖过程中应注意的问题，介绍了案例工程中对这些问题的解决方案

Abstract: In recent years, cement fly ash gravel (CFG) piles with its low cost, high bearing capacity, convenient construction advantage are widely used in high-rise residential buildings. However, in the pit excavation process, pile fracture is caused by immature excavation scheme, which will directly affect the quality of piles and construction schedule. In this paper, combined with pile breaking producing in CFG piles composite foundation pit excavation process of a high-rise building, the uncertainty factors affecting the pile fracture in excavation process and the problems paid attention to the excavation process are analyzed， and the solution of these problems in the project is introduced.