打桩引起的地面振动的研究

Analysis of ground vibration due to pile driving

为了对打桩引起的地面振动进行研究,应用一维应力波理论建立了粘弹性成层土中等截面弹性桩的力学模型,得到了桩中任意一点处位移的半解析解。利用桩与土的相互作用将桩对土的作用力简化到各土层面上。在复阻尼理论和纳维方程的基础上,利用分层法得到了任意荷载作用下土的位移、速度和加速度的解。从而得到了打桩引起的地面振动的衰减特性。通过实测结果和计算结果的比较说明了该方法的可行性。

In order to study the ground vibration due to pile driving, one dimensional stress wave theory was used to establish the model of elastic pile with invariable section in the visco-elastic layered soils. The semi-analytical solution of the displacement along the pile shaft was derived. Taking advantage of the interaction between pile and soil, the force that the soil was exerted due to pile driving was simplified to the contact surface of the layered soils. Based on complex damping theory and Navier equation, the displacement of soil under any loads was calculated using multi-layer method, the velocity and acceleration were deduced. The attenuation characteristics of ground vibration caused by pile driving were proposed. The feasibility of this model was demonstrated by comparing the theoretical analysis and the field test data.