冲孔灌注桩施工至不同土层引起的场地振动测评

本文结合工程现场实测,研究冲击钻成孔灌注桩施工至不同土层时引起的场地振动效应,并对振动对周边建筑及环境可能引发的影响进行了分析。研究结果表明场地速度峰值基本随着冲孔深度加深而减弱,但岩性较好土层其引发的振动量级亦较大;对振动效应进行评价时应根据具体情况及需求选择适当的评价标准。

Test and evaluation of ground vibration induced by construction of impact bored pile under different soil layers

Based on in-site test,the ground vibration effects induced by construction of impact bored pile under different soil layers were investigated in the paper.The influence on nearby buildings and circumstances caused by ground vibration were analyzed.The investigation shows that the ground velocity peaks basically descend with the deepening of construction of bored pile.Furthermore,the better lithological character of the soil layer is,the larger magnitude vibrations are aroused.The choice of appropriate evaluation criterion to vibration effect should be on the basis of the specific circumstances and requirements.