饱和沙土中高频液压振动沉桩敏感性因素分析

Sensitivity analysis of high frequency hydraulic vibrating pile in saturated sandy soil

高频液压振动沉桩工艺具有沉桩效率高、降低噪声、经济环保等优点被广泛应用于岩土工程施工领域.结合云南省昆明市昆纺原址改造项目钢管桩高频液压振动沉桩工程实例.采用数值模拟方法对高频液压震动桩桩径敏感效应分析,桩径分别取0. 83、1. 00、1. 20、1. 40 m采用Midas GTS-NX三维动力有限元数值模拟、得出四种不同桩径下三维整体动力模型、位移场云图、钢管桩沉桩位移曲线、加速度场云图、周地表土体竖向加速度变化曲线、周地表土竖向加速度变化曲线.结果表明,随桩径的增大钢管桩沉桩位移降低,竖向加速度也随桩径的增大而减小.钢管桩的沉桩位移量随着钢管桩桩径的增加而逐渐减少.

High frequency hydraulic vibrating pile driving technology has high pile driving efficiency,lower noising,the advantages of economy and environmental protection,which are widely used in geotechnical engineering. A case study of high frequency hydraulic vibrating pile sinking project for steel pipe pile reconstruction project was committed in Kunming. The sensitivity of high frequency hydraulic vibration pile diameter was analyzed by numerical simulation. Separate pile diameter 0.83,1.00,1.20,1.40 m,using Midas GTS-NX Three-dimensional dynamic finite element numerical simulation,Three-dimensional integral dynamic model under four different pile diameters was obtained,displacement field cloud map,displacement curve of steel pipe pile,cloud atlas of acceleration field,vertical acceleration curve of surrounding soil,vertical acceleration curve of the surrounding surface soil. The results showed that the displacement of steel pipe pile decreased with the increase of pile diameter,and the vertical acceleration decreased with the increase of pile diameter. The displacement of steel pipe pile decreased gradually with the increasing of steel pipe pile diameter.