人工挖孔桩桩端土承载力的确定

The definition of bearing capacity of the artificial excavating pile end soil

城市建设中高层建筑越来越多,基础大多采用单桩承载能力很高的人工挖孔灌注桩。既保证桩基工程的安全,又能节省工程造价,桩端土承载力参数的确定在基础工程设计中是十分重要的。本文提出了应用深层平板载荷试验方法能够较准确的提供桩端土承载力参数,并在不同地质条件下进行了试验,积累了本地区的一些经验;同时认为在桩端土为中粗砂、泥岩时,应用效果很好;桩端土为粘性土时,应用效果较差。

The high buildings are more and more in urban construction, most foundations are artificial excavating grout piles with high bearing capacity. It can both ensure grout piles safety and reduce production cost, so, it is very important that definite the bearing capacity parameter of pile end soil. The paper proposed that the application of the deep plate bearing experiment method can accurately contribute bearing capacity parameter, we made an experiment in different conditions and accumulated some experience in this region; it is considered that it should be good result when pile end soil is medium coarse sand and mudstone; it should be relative bad result when pile end soil is clay soil.