静压管桩施工中孔隙水压力消散规律研究  

Study on pore water pressure in static pressure pipe pile construction

作　　者：刘岑 陈曦 马昊天 毛力 冯浩清 王哲[3] 宋佳峰 章韬 Liu Cen;Chen Xi;Ma Haotian;Mao Li;Feng Haoqing;Wang Zhe;Song Jiafeng;Zhang Tao(Daishan County Economic Development Service Center,Daishan 316200,China;East China Engineering Consulting Co.,Ltd.,Hangzhou 311100,China;Collge of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Jinhua Duohu Central Business District Construction Investment Co.,Ltd.,Jinhua 321000,China)

机构地区：[1]岱山县经济开发服务中心,浙江岱山316200 [2]浙江华东工程咨询有限公司,浙江杭州311100 [3]浙江工业大学土木工程学院,浙江杭州310023 [4]金华市多湖中央商务区建设投资有限公司,浙江金华321000

出　　处：《山西建筑》2022年第16期78-81,共4页Shanxi Architecture

摘　　要：对比锤击法,静压管桩施工法的单桩承载力更高,且沉降量也远低于锤击法,所以静压管桩施工法近年来被广泛运用,但在沉桩过程中会引发挤土效应,即造成土体中的孔隙水压力上升,导致桩基承载力和桩周土体变形受到影响。结合“高亭-双合快速主干线”的建设工程,通过现场监测孔隙水压力在沉桩前后两个阶段的变化曲线,对静压管桩在施工过程中引起孔隙水压力的变化进行实时监测,得到100 d的孔隙水压力实测数据,分析监测数据表明:沉桩过程中引发的孔隙水压力变化在一定范围内,随着深度的增加近似呈线性增长,随着桩身水平距离的增加而下降;孔隙水压力随时间的消散规律也近似一条平稳的曲线,随着时间的增加,孔隙水压力也随之缓慢消散,直至低于沉桩前的孔隙水压力大小。Compared with the hammering method,the static pressure pipe pile construction method has a higher bearing capacity of a single pile,and the settlement is far lower than that of the hammering method.Therefore,the static pressure pipe pile construction method has been widely used in recent years,but in the process of pile sinking,it will cause the soil squeezing effect,that is,the pore water pressure in the soil will rise,which will affect the bearing capacity of the pile foundation and the deformation of the soil around the pile.Combined with the construction project of“Gaoting-Shuanghe express trunk line”,through on-site monitoring of the change curve of pore water pressure in the two stages before and after pile sinking,real-time monitoring of the change of pore water pressure caused by static pressure pipe piles in the construction process is carried out.The measured pore water pressure data of 100 days are obtained.The analysis and monitoring data show that the pore water pressure caused by pile sinking changes in a certain range,increases linearly with the increase of depth,and decreases with the increase of horizontal distance of pile body.The dissipation law of pore water pressure with time is also similar to a stable curve.With the increase of time,the pore water pressure also slowly dissipates until it is lower than the pore water pressure before pile sinking.

关 键 词：现场实验 静压管桩 孔隙水压力 饱和软土 

分 类 号：TU473[建筑科学—结构工程]