Abstract:The post-grouting process of bored piles has been widely used in China because it can improve the bearing capacity and reduce deformation by playing the role penetration, splitting filling, compaction and consolidation on the bottom sediment of piles, the bearing stratum at the pile end and the mud skin around the pile. However, due to the large concealment of post-grouting construction, simple equipment, low market access threshold, and uneven quality and ability of construction units, problems have occurred in many engineering applications. A large number of practices show that the single pile bearing capacity of bored piles with consistent pile type and size and the same post-grouting process often shows differences in different projects or different parts of the same project. At this time, if the calculation formula of the bearing capacity of the single pile with post-grouting process is simply applied according to the pile foundation specification or suggestions of many studies, the results often deviate from the actual situation, and in most cases, the calculated value is significantly higher than the static load test results, brings great safety hazards to the construction project. The comprehensive estimation method of single pile bearing capacity proposed in this paper is analyzed from many aspects, covering the influence of various factors, the calculation formula simple and easy to understand, the method is convenient and feasible, and the results are close to the actual after the application verification of many engineering examples, with high safety reliability, and the application effect is good.
