软土地区钢板桩振动沉桩监测及环境效应分析  

Monitoring and Environmental Effect Analysis of Steel Sheet Pile Vibration Driving in Soft Soil Area

作　　者：陈晓飞[1] CHEN Xiaofei(Jiangsu Huadong Geological Construction Group Co.,Ltd.,Nanjing 210007,China)

机构地区：[1]江苏华东地质建设集团有限公司,江苏南京210007

出　　处：《甘肃科学学报》2023年第1期80-86,105,共8页Journal of Gansu Sciences

摘　　要：钢板桩振动沉桩对周边土体和建筑物的影响一直是钢板桩应用中倍受关注的问题。选取从北向南5个沿海典型软土地区,通过三轴测振仪进行了振动沉桩监测,提取了距离振源不同距离处地表的径向、切向和竖向的振动加速度,并利用Matlab和SeismoSignal软件分析了振动峰值加速度和振动峰值速度随着测点到振源不同距离的变化趋势。结果表明,软土地区的振动响应相比硬土地区明显降低,但软土地区地表振动与土层性质和土层变化有关。在软土层上覆较好土层的地区,由于剪切带较大,地表径向峰值加速度随着测点到振源距离的增加出现先增加后减小的现象;但切向加速度由于钢板桩在沉桩过程中产生水平位移作用的附加影响而并未减小。钢板桩在软土地区的地表振动加速度和速度峰值在距离振源0~3 m范围迅速衰减,超过3 m后钢板桩振动沉桩环境效应较小。最后给出了不同建筑物类型下软土地区钢板桩振动沉桩环境效应的最小安全距离,可供设计和作业人员参考。The influence of steel sheet pile vibration driving on surrounding soil and buildings has always been the greatest concern in steel sheet pile construction.Here,the vibration of the radial,tangential and vertical vibration accelerations of the surface at different distances from the vibration source on five typical coast regions of soft soil are measured with the aid of triaxial vibrometer.The variation trend of vibration peak acceleration and vibration peak velocity with different distances of measuring points and vibration sources are analyzed by using Matlab and SeismoSignal software.As shown by the results,the vibration response of soft soil area is obviously lower than that of hard soil are.However,the surface vibration of soft soil area is related to soil properties and changes in the soil layers.The soft soil is overlaid with silty clay,the radial peak acceleration of the surface increases first and then decreases with the increase of the distance from the measuring point to the vibration source due to the large shear zone.However,the tangential acceleration does not decrease owing to the additional effect of horizontal displacement of steel sheet pile during pile driving.The peak value of surface vibration velocity of steel sheet pile decreases rapidly in the range of 0~3 m from the vibration source in soft soi.The influence of environmental effect is weakened after the range is exceeded.As a results,the minimum safe distances of vibration environmental effect in soft soil area under different building types have been given,which can be used for reference by engineering designers and operators.

关 键 词：钢板桩 振动沉桩 监测 环境效应 峰值加速度 

分 类 号：U445.551[建筑科学—桥梁与隧道工程]