黏土地层中PC工法桩振动沉桩环境效益分析  

Environmental Benefit Analysis of Vibration Piling of PC Pile in Clay Strata

作　　者：李煜 丁昊 张世民 LI Yu;DING Hao;ZHANG Shimin

机构地区：[1]杭州市拱墅区建设工程质量安全监督站,浙江杭州310000 [2]浙大城市学院土木工程研究所,浙江杭州310015

出　　处：《现代城市》2023年第2期24-28,共5页Modern City

基　　金：浙江省住建厅科研项目(2020K074);浙江省大学生科技创新活动计划(新苗人才计划)项目。

摘　　要：以铁路北站单元GS1104-18地块项目为依托,开展PC桩振动沉桩现场试验,基于工程建立三维有限元数值分析模型,研究沉桩产生的挤土效应。研究结果表明:(1)土体水平位移呈上大下小的“半葫芦”状,上层变化大,底部小;(2)沉桩造成桩周深层土体隆起,振动远离,浅层土体隆起减缓,孔隙水压消散;(3)各测点的地表况降曲线变化趋势为发生沉降-隆起-位移稳定,其中累计最大位移处上升1.5cm;(4)在径向方向上,振动远离,孔隙水压值越小,变化幅度越小,在深度方向上,深度越深,孔隙水压值越大,变化幅度越小。Based on the GS1104-18 plot project of the North Railway Station unit,on-site tests of PC pile vibration piling were carried out,and a three-dimensional finite element numerical analysis model was established based on engineering to study the soil compaction effect caused by piling.The research results indicate that:(1)the horizontal displacement of the soil is in a"half gourd"shape with large changes in the upper layer and small changes in the bottom;(2)Pile sinking causes deep soil uplift around the pile,causing vibration to move away,while shallow soil uplift slows down and pore water pressure dissipates;(3)The trend of surface settlement curves at each measuring point is settlement-uplift-displacement-stability,with a cumulative maximum displacement increasing by 1.5 cm;(4)In the radial direction,when the vibration is far away,the smaller the pore water pressure value,the smaller the amplitude of change.In the depth direction,the deeper the depth,the greater the pore water pressure value,and the smaller the amplitudeofchange.

关 键 词：PC工法桩 振动沉桩 挤土效应 原位试验 数值模拟 

分 类 号：TU4[建筑科学—土工工程]