基于孔压静力触探数据确定水泥土深层搅拌桩法桩基持力层

摘要

为了准确确定DCM桩基持力层的界面及厚度,在CPTu基础数据与地基土强度的经验换算公式基础上,分析持力层的判定方法.通过分析试验曲线的特征,运用累积锥尖阻力的方法,提出了选用锥尖阻力界值进行判定的初步评估方法.该法在大面积深厚软土场地DCM桩基工程中得到了较好的验证.%To accurately determine the boundary and embedment length of the bearing stratum of DCM pile foundation, the determination method of bearing stratum is analyzed based on the empirical relationship between the CPTu data and the soil strength.Combined with the analysis of the characteristics of piezocone penetration test curve and the method of cumulative cone tip resistance, a preliminary evaluation method is proposed for selecting the boundary value of cone tip resistance, which has been well verified in DCM pile foundation project of large area and deep thick soft soil.