摘要
依托深基坑钢管支护桩振动沉桩工程实例,基于三维动力有限元方法,采用数值模拟、正交分析及灰色关联度理论,对影响湖相沉积土层中深基坑钢管支护桩高频振动沉桩位移量的因素进行了敏感性分析,并对钢管支护桩高频振动沉桩的工艺参数进行了优化。研究表明:湖相沉积土层中深基坑钢管支护桩高频振动沉桩过程与土层参数、振动激振力、振动频率和钢管桩桩径等因素关系密切;与钢管支护桩高频振动沉桩位移量关联度的大小依次为振动激振力、振动频率、钢管桩桩径和土体动弹性模量,关联度分别为0.79、0.76、0.74和0.60;湖相沉积土层中深基坑钢管支护桩高频振动沉桩的最佳工艺参数为桩径0.83m、振动激振力1 875kN、振动频率20Hz。
This study took the engineering project of the steel pipe vibration supporting piles in deep foundation as an example and the three-dimensional dynamic finite element method as the basis.Numerical simulation,orthogonal analysis and grey relational theory were adopted to make a sensitivity analysis of factors that influenced the displacement of high-frequency vibration piles in the deep foundation in lacustrine sedimentary layers.The parameters of high frequency vibration steel piles were optimized.The results show that the steel piles of deep foundation in lacustrine sedimentary soil are closely related to soil parameters,exciting force,vibration frequency and steel pipe pile diameter.The exciting force,vibration frequency,steel pipe pile diameter and dynamic elastic modulus are in turn related to the displacement of high frequency vibrating pile of steel,with the correlation degree being 0.79,0.76,0.74 and 0.60 respectively.The optimal parameters of high-frequency vibration pile sinking are 0.83 min diameter,1 875 kN in exciting force and 20 Hz in vibration frequency in the lacustrine sedimentary soil.
引文
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