摘要
利用广义Voigt模型来考虑桩侧土体的线弹性性质和粘性特性,研究了成层地基中静荷载作用下单桩沉降的时间效应。首先,根据桩侧土的成层情况,将桩土系统从下至上划分为有限层,对每层桩土系统建立静力平衡方程;然后,利用Laplace变换技术和阻抗函数递推方法求出了频域内桩顶位移响应的解析解,进一步利用Fourier变换技术和卷积定理求出了相应静荷载作用下考虑时间效应的单桩桩顶沉降半解析解;最后,采用参数研究方法,分析了桩土参数对单桩沉降性状的影响,并将工程桩的实测数据与本文计算结果进行了对比。结果表明:在工程桩受荷初期,本文得到的解能较好地计算出单桩沉降性状。
By virtue of general Voigt model to simulate characteristics of soil surrounding the pile, the time effect of static loading in layered soil was investigated. Firstly, the linear elasticity and viscosity settlement of single pile undergoing allowing for the variation of soil properties, the pile-soil system was divided into finite segments and the static equilibrium equation of each segment was derived. Then, by means of the Laplace transform technique and impedance function transfer method, the analytical solution of displacement response at the pile head in frequency domain was yielded. Also, the semi-analytical solution in time domain undergoing static loading at the pile head was obtained by means of Fourier transform technique and convolution theorem. At last, based on these solutions, a parametric study was conducted to analyze the influence of the parameters of pile and soil on the settlement of single pile. Results show that the solutions in the paper is reasonable when the pile undergoes minor loadings by making a comparison with the theoretical results and testing results of a site pile.
出处
《建筑科学与工程学报》
CAS
北大核心
2012年第3期73-80,共8页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(50879077)
关键词
单桩沉降
时间效应
粘弹性地基
静力平衡方程
广义Voigt模型
settlement of single pile
time effect
viscoelastic foundation
static equilibrium equation
general Voigt model
