增强型离心桩施工引起的超静孔隙水压力分析  

ANALYSIS OF EXCESS PORE WATER PRESSURE CAUSED BY CONSTRUCTION OF SINGLE ENHANCEMENT CENTRIFUGAL PIPE

作　　者：付贵海[1,2] 魏丽敏[1] 王永和[1] 周慧[3] 

机构地区：[1]中南大学土木建筑学院,长沙410075 [2]湖南城市学院土木工程学院,湖南益阳413000 [3]湖南城市学院城市管理学院,湖南益阳413000

出　　处：《工业建筑》2011年第2期45-48,56,共5页Industrial Construction

基　　金：铁道部科技研究开发计划重点课题(2009G008-B2010G018-F-3)

摘　　要：在深厚软土地区采用锤击法进行预应力管桩施工,由于土体受到剧烈扰动及软土较差的渗透性,会在桩周软土中产生很高的超静孔隙水压力。通过对现场实测超静孔隙水压力资料的分析和整理,探讨增强型离心桩施工产生的超静孔隙水压力在径向及深度上的分布规律,研究单桩施工不同时刻超静孔隙水压力变化规律。分析结果表明:单桩的沉桩显著影响范围为17.5倍桩径,超静孔隙压力的峰值并不一定出现在末节管桩施工结束后,另外,增强型离心桩单桩施工产生的超静孔隙水压力比普通的预应力管桩产生的超静孔隙水压力消散得快,在施工结束4h后,可以消散70%～80%。Prestressed concrete pipes construction by hammer can produce high excess pore water pressure in deep soft soils because of violent disturbance and poor permeability of soft soil.Through analyzing the data of excess pore pressure in sites,it was analysed excess pore pressure’s distribution distance against the pile and along depth,and was also studied excessive pore water pressure change in different time of single pile construction.The analysis results show that the notable influencing range of single pile construction is about 17.5 times of the pile diameter,and the peak excess pore pressure does not necessarily appear at the end of the last section pile construction,and excess pore water pressure caused by the construction of single enhancement centrifugal pile dissipates faster than that induced by normal prestressed concrete,and 70% to 80% excess pore water pressure can be dissipated after 4 hours in the end of single pile construction.

关 键 词：软土 增强型离心桩 单桩 沉桩 超静孔隙水压力 

分 类 号：TU753.3[建筑科学—建筑技术科学]