锤击法和振动法沉桩对周边环境影响的研究

An Investigation of Surrounding Impacts Caused by Hammering and Vibration Pile-driving

使用有限元-无限元耦合方式建立了预制桩沉桩施工的三维有限元模型,将这一模型用于沉桩全过程的模拟。通过沉桩模拟结果与实测数据的对比,验证了所建模型的正确性。结合上海地区地质条件,对比了锤击法和振动法两种沉桩方式引起的振动衰减特征,根据有限元分析结果提出了地面振动的衰减公式。基于已有振动安全控制标准,提出了普通民房的振动控制标准,评估了两种沉桩方式的振动影响范围。本文成果可以为类似条件下沉桩方式的选择提供一定的参考。

Using the finite-infinite element coupling method,a three-dimensional finite element model was established to simulate the whole driving process of a precast pile. After comparing the simulated results with the measured ones in field,the reliability of the model was then verified. Combining the validated model with the actual geological conditions in Shanghai,a comparative study was thereafter performed for the attenuation features of vibrations caused by two kinds of pile driving techniques,the hammer and vibratory pilings. The vibration attenuation formula at the ground surface was also put forward by fitting the simulated results in finite element method. According to the existing vibration control safety standards,the vibration control value was recommended for the ordinary houses,and the corresponding influencing range of vibration caused by two pilings was accessed. The results herein may provide a reference for choosing the pile-driving techniques under the similar surrounding.