均质土中部分埋入粘弹性变模量桩基的瞬态波动响应

Transient Wave Response of the Viscos-elastic Pile with Variable Modulus Embedded Partially in Homogeneous Soil

应用回传射线矩阵法,求得半个正弦波脉冲作用下均匀土中部分埋入粘弹性变模量桩任意段桩顶速度波响应,通过对比部分埋入粘弹性完整桩与部分埋入粘弹性变模量桩的反射速度波波形,分析部分埋入粘弹性变模量桩在不同桩身阻尼、不同缺陷程度的反射速度波波形.结果表明:粘弹性桩基在变模量段与完整段的反射速度波波形相反;在桩身缺陷处模量变化值越大,反射波信号越强烈;桩身阻尼对于速度波传递有衰减和粘滞作用.

Based on the method of reverberation ray matrix,the velocity mobility at the top of pile with arbitrary viscos-elastic variable modulus sections was acquired,which has been embedded partially in homogeneous soil and under the excitation of unit delta time force. By comparing the reflection velocity wave shape between complete viscoelastic pile and variable modulus viscoelastic pile,reflection velocity wave shape of the viscoelastic pile of different damping and different defect level is analyzed,which is embedded partially in homogeneous soil.The results show that the reflection velocity wave shape of viscoelasticity pile in modulus and complete sections had been distributed opposite axis; At the sections of defect pile,the greater modulus change,the stronger the reflection wave signals; The damping in the pile has viscous and attenuation functions for speed wave transmit.