动力法计算振冲碎石桩桩体压缩模量

Dynamic Method for Calculating the Compressive Modulus of Vibro-Replacement Stone Column

振冲碎石桩为散体结构,所形成的复合地基受垂直荷载后的变形较刚性桩复合地基要大,为研究振冲碎石桩复合地基的沉降规律,建立振冲器动力性能指标与碎石桩桩体强度的关系。根据压缩模量概念,结合振冲桩制桩工艺,建立桩体压缩模量与振冲器激振力、施工中的加密段长、加密电流及留振时间的关系式——动力法。采用动力法和载荷试验法所得的压缩模量在沉降量计算中进行对比,结果与按实际观测推算值的偏差均小于10%。

Vibro-replacement stone column is uncemented structure.The deformation formed by the vertical load on the vibro-replacement stone column composite ground is more than that on rigid piles composite foundation.The relationship between a vibrator power performance indicators and stone column body strength is established for the study of the stone column composite ground settlement.In the light of compressive modulus concept,combined with vibrating stone column technology,established the relationship of stone column compressive modulus with vibrating force,density column long,density current and vibration time—which is called dynamic method.The compressive modulus from a dynamic method was used in settlement calculation and compared with that settlement using the modulus from load test.The deviation of the settlement with both methods from that based on actual observation projected value is less than 10%.