高频免共振液压振动锤沉桩对桩周土影响的研究  

Study on the Influence of High-Frequency Resonance Free Hydraulic Vibrating Hammer Driving Pile on the Soil around the Pile

作　　者：王禕 WANG Yi(Shanghai Tunnel Engineering Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]上海隧道工程有限公司,上海200032

出　　处：《中国市政工程》2022年第5期91-95,127,128,共7页China Municipal Engineering

摘　　要：与传统工艺相比,高频免共振液压振动锤沉桩具备噪声低、振动小、免共振、低荷载、适用地质条件广且工期短的优点,近年来应用范围逐步扩大。依托上海市某工程项目,通过现场试验,分析其对于桩周土体的影响,结果表明:高频免共振液压振动锤长期振沉钢管桩使周围土体产生一定的沉降和侧移,并改变了桩周土压力和孔隙水压力;随着沉桩过程的不断进行,分层沉降、水平位移、土压力和孔隙水压力整体呈增大趋势。沉桩全部结束后,水平挤压位移最大达37 mm,上抬位移最大达35 mm,孔隙水压力最大增量达76 kPa,土压力最大增量达150 kPa,表明长期振动沉桩施工对于桩周土体水平位移存在一定影响,对土体竖直位移影响较小。沉桩结束后,土压力和孔隙水压力有恢复至初始值的趋势。Compared with the traditional process,the high-frequency resonance free hydraulic vibratory hammer has the advantages of low noise,small vibration,resonance free,low load,wide application geological conditions&short construction period,and its application scope has gradually expanded in recent years.Relying on a project in Shanghai,through field tests,the impact on the soil around the pile is analyzed.The results show that the long-term vibration sinking of steel pipe piles by high-frequency resonance free hydraulic vibratory hammer causes a certain settlement&lateral displacement of the surrounding soil,and changes the soil pressure&pore water pressure around the pile.With the continuous process of pile sinking,layered settlement,horizontal displacement,soil pressure&pore water pressure are increasing.After the pile sinking is completed,the maximum horizontal extrusion displacement is 37 mm,the maximum uplift displacement is 35 mm,the maximum increment of pore water pressure is 76 k Pa,maximum increment of soil pressure is 150 k Pa,which indicates that long-term vibration pile sinking construction has a certain impact on the horizontal displacement of the soil around the pile,and has little impact on the vertical displacement of the soil.After pile sinking,the soil pressure&pore water pressure tend to return to the initial value.

关 键 词：高频免共振液压振动锤 长期原位试验 钢管桩 土压力 孔隙水压力 

分 类 号：TU753.3[建筑科学—建筑技术科学]