【摘要】 为了合理解释成层土中桩的完整性测试,建立了桩端为弹性阻尼支承、桩顶在任意荷载作用下粘弹性变截面桩与多层土共同作用的数学模型,并利用拉普拉斯变换和矩阵理论求得了该模型的振动半解析解,然后利用卷积定理和傅立叶逆变换求得瞬态半个正弦波作用下桩顶响应的振动半解析解。最后,采用数值模拟分析了桩周土层和桩身截面变化位置相同和不同两种情况下,桩周土参数的变化对桩顶速度响应的影响,同时还分析了桩身阻尼的变化对桩顶速度响应的影响。更多还原

【Abstract】 In order to reasonably interpret pile integrity test,the model of viscoelastic pile with variable sections in layered soils is established. When the pile is subjected to exciting force at its top,the viscoelastic supporting at its tip is taken into account . By means of Laplace transform and matrix theory,the semi-analytical solution of pile-soil systerm is derived. Further,with the help of the convolution theorem and inverse Fourier transform,a semi-analytical solution on the velocity response of pile top to semi-sine impulse exciting is obtained. Later,by numerical methods,the influences of layered soils and pile parameters on velocity response of pile top are simulated,and several significant conclusions for pile integrity test are drawn.更多还原