摘要
真空度是真空预压加固效果的重要保证,而目前真空负压沿深度方向的衰减规律没有统一的设计标准.基于国内真空度衰减规律研究结果通常在2~7kPa/m范围内,本文提出真空度沿深度的衰减系数,提出改进真空负压解析解,结合黄华码头和天津港国际邮轮码头两个真空预压工程实例,分析真空度衰减对超静孔隙水压力分布的影响.通过分析得到,不同的真空度衰减系数下超静孔隙水压力分布规律不同,真空度衰减系数对超静孔隙水压力计算有较大的影响,并建议当缺乏可靠的真空度衰减实测资料时情况下,真空度沿深度方向的衰减规律取值为3~5kPa/m进行设计计算.
The vacuum degree is an important factor for ground improvement by vacuum preloading.However,there is still no design standard for considering the damping of vacuum pressure along the PVDs.The data compiled from literature shows that the loss of the vacuum pressure changes within the range of 2-7kPa/m.This study proposes a damping coefficient of vacuum pressure along the PVDs and provides an extended analytical solution and analyzes the effects on excess pore-water pressure distribution by the damping of vacuum pressure with the vacuum preloading project in Huanghua and Tianjin port.It is obtained that the difference distribution of excess pore-water pressure under different damping coefficients of vacuum degree,damping coefficient of vacuum pressure has a larger effect on excess pore-water pressure calculation.It is suggested that damping regularity of vacuum along the depth direction is 3-5kPa/m for design calculation,when it is lack of the reliable measured data.
出处
《三峡大学学报（自然科学版）》
CAS
2015年第4期51-54,共4页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金(51378118)
中央高校基本科研业务费专项资金资助"江苏省普通高校研究生科研创新计划资助项目"(SJLX_0096)
水利部公益性行业科研专项经费项目(201401006)
泰州引江河第二期工程快速泥水分离技术与应用研究
关键词
真空度
衰减系数
超静孔隙水压力
负压解析解
vacuum degree
damping coefficient
excess pore water pressure
analytical solution of vacuum pressure
