基桩低应变检测的波动方程法数值计算

Numerical computation of the wave equation for low strain test piles

文章建立了以桩的连续杆件模型和土的线弹性模型为基础的低应变数值计算模型,并利用行波理论求解波动方程;编制了计算程序,通过拟合计算,分析桩的完整性,并对应力波在桩中的传播规律进行了研究。工程桩计算对比表明,理论计算曲线与实测曲线有较好的一致性,拟合所得缺陷位置及类型与实际情况基本吻合。文章对基桩低应变动力检测具有理论和实用意义。

The low strain numerical computation model of piles is established based on the model of the continuous bar and the linear elastic model for soil. The wave equation is solved according to the traveling wave theory. A computer program is written,and matching computation is carried out to analyze the integrity of piles. The transmitting regularity of the stress wave in the pile is studied. Numerical computation of two engineering piles is made and the theoretical curves are matched to the measured curves,which shows that the position and type of the defect were in accordance with the practical situations. This study has theoretical and practical significance for low strain dynamic testing of piles.