冲击碾压改建旧水泥混凝土路面施工时的地基振动特性  

Subgrade vibration characteristics during PCC pavement rehabilitation with impact roller

作　　者：胡昌斌[1] 阙云[1] 

机构地区：[1]福州大学土木工程学院,福州350108

出　　处：《振动与冲击》2010年第11期124-130,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(50908056);福建省高等学校新世纪优秀人才计划(TW2006-27);福建省自然科学基金项目(2009J01249)

摘　　要：为了解冲击碾压水泥混凝土路面施工时的地基振动与影响特性,基于动力三维有限元分析方法,考虑材料的弹塑性,对四楞冲击压路机冲击碾压水泥混凝土路面时地基的振动与传播特性进行了研究,并将数值计算结果与现场地基振动监测数据进行了对比分析;然后将冲击碾压地基实测振动信号作为输入,对离震源不同距离的砌体和框架建筑结构时程动力响应进行了计算,探讨了冲击碾压改建施工的安全防护标准。研究表明冲击碾压引起的地基振动具有冲击瞬态特性,地基振动中竖向振动加速度分量最大,横向振动和纵向振动加速度大小相当。振动加速度各分量沿道路横向距离10m范围内衰减变化显著,随着冲击破碎遍数递增,土基振动有增大现象。冲压振动与结构物的共振效应较小,对15m以外的完好建筑物影响很小。建议在普查无临界状态房屋条件下结构安全距离为15m,考虑对人的振动影响安全距离为20m。Subgrade vibration characteristics during concrete pavement rehabilitation with impact roller were studied by three dimensional elastic-plastic dynamic FEM,and the calculation results were verified by feild test data.Based on the results of field monitoring data,the dynamic time history responses of different buidings under subgrade vibration and construction safety distance were analyzed.The results indicated that subgrade vibration induced by impact rolling load has impact transient property,the vertical vibration acceleration is that maximum between vertical,longitudinal and transverse vibration acceleration,the vibration accelerations decaies significantly in the range of 10m away from the impact source; and vibration acceleration increases a little with impact times; increase.Subgrade vibration has little dynamic effect on buildings 15m far away from the impact source; and buildings resonance effet is little it is advised that the safety distance is 15m far away from the impact source for the buildng in good condition,and 20m for human.

关 键 词：水泥混凝土路面 冲击碾压 动力弹塑性有限元 地基振动 

分 类 号：U416.216[交通运输工程—道路与铁道工程]