在振动沉管灌砂桩基础工程进行试桩中发现不正常的现象：当套管沉到标高后，在边振动、边拔套管、边灌砂时灌入的砂量小于计算的砂量。经过分析，认为直接的影响因素如下：（1）地质情况。表层为亚粘土厚约3m，第二层为粉砂层厚约2．sin，第三层为淤泥夹层厚约3m，再往下为粗砂 An abnormal phenomenon was found in the test piles of the vibrated immersed pipe sand pile foundation project. When the casing sinks to the elevation, the amount of sand poured in when the edge vibrates, pulls out the casing, and fills the sand is smaller than the calculated amount of sand. . After analysis, the direct impact factors are as follows: (1) Geological conditions. The surface layer is about 3m thick and the second layer is about 2. Sin, the third layer is about 3m in thickness of silt, and then down to coarse sand