锤击法沉桩对周边建筑振动影响有限元分析

FEM analysis of hammering pile-driving effect on the surrounding buildings

为研究锤击法沉桩振动影响,以某工程为例,使用ABAQUS建立三维有限元模型并施加无限元人工边界,以实现锤击沉桩施工过程。通过实地测试数据拟合结果,总结出锤击法施工下土体振动衰减规律。结合现有规范,给出了锤击法施工对于3种不同建筑类型的影响范围。结果表明,锤击法下土体质点速度呈衰减趋势,振荡速度峰值在频率为0.5 Hz时出现,主频集中于3.8~6 Hz之间,属于低频振荡且受阻尼效应影响,衰减较为缓慢。单桩锤击法施工条件下,工业、民用和敏感建筑影响范围分别为12.5、14.0和22 m,研究成果可为类似施工条件下的沉桩过程提供参考。

In order to study the vibration effects of hammering pile-driving,a three-dimensional finite element model was established by using ABAQUS and an infinite artificial boundary was applied to simulate the construction process of hammering pile driving.Based on the fitting results of field test data,the law of soil vibration attenuation under the hammer method was summarized.Finally,combined with the existing specifications,the influence scope of hammering pile-driving on three different building types was given.Results show that under the hammering method,the particle velocity of soil shows an attenuation trend,and the peak value of oscillation velocity appears when the frequency is 0.5 Hz,and the main frequency concentrates between 3.8~6 Hz,which is a low-frequency oscillation and is affected by the damping effect,and its attenuation is slow.Under the construction condition of single pile hammering method,the influence range ratios of industrial,civil and sensitive buildings are 12.5 m,14.0 m and 22 m respectively.The research results can provide reference for the pile sinking process under similar construction conditions.