真空预压加固软基竖向排水体负压分布模式研究  

ANALYSIS OF NEGATIVE PRESSURE DISTRIBUTION OF VERTICAL DRAINAGE CHANNELS FOR STABILIZATION OF ROADBED BY VACUUM PRELOADING

作　　者：王星华[1] 雷鸣[1,2] 

机构地区：[1]中南大学土木建筑学院,长沙410075 [2]长沙学院土木工程系,长沙410003

出　　处：《工业建筑》2010年第10期86-90,共5页Industrial Construction

摘　　要：在其他条件都相同的前提下,将线形、抛物形形、指数曲线形负压分布模式分别应用于京沪高速铁路真空预压试验段竖向排水通道中。运用有限单元法模拟现场地质和施工情况,计算路基固结过程,并将沉降计算结果和坡脚处水平位移计算结果与实测值进行对比分析。对三种分布模式计算结果与实测值的差异原因进行分析,分析发现:竖向排水通道负压分布沿通道由上至下按线性分布假定,即从某一个特定值的方法按线性折减到零或某个特定值的方法不十分符合实际,将导致数值分析的计算结果与实际差距较大。建议在淤泥中,竖向排水通道负压分布采用指数曲线形分布,但在硬壳层深度范围内的竖向排水通道负压分布模式可按线性模式进行设置。Three negative pressure distribution modes—line mode,parabola mode and exponent mode were respectively applied in the vertical drainage channels of the vacuum preloading test section of Beijing-Shanghai High-Speed Railway under identical conditions.Finite element simulation was made in calculation of the consolidation process of roadbed.The calculation results were compared with measured data.Differences of calculation results were found with the above mentioned three distribution modes.Reasons causing the differences between calculation results and measured data of the three distribution modes were analyzed.Analysis results show that,it is not very rational that negative pressure linearity-decrease from one value to zero or the other value along up-to-down vertical drainage channels.This will cause too much difference between calculation results and measured values.The negative pressure distribution mode of exponent type is commended to apply in silts.But the negative pressure distribution mode of line type is available to the vertical drainage channels in crust up silt.

关 键 词：竖向排水通道 数值分析 真空预压 负压分布 

分 类 号：U416.1[交通运输工程—道路与铁道工程]