潮汐环境堆填速率对软土固结过程动态影响研究  

Study of Dynamic Impact of Preloading Rate under Tidal Environment on Soft Soil Consolidation

作　　者：彭森良[1] 吴继敏[2] 魏继红[1] 

机构地区：[1]河海大学土木工程学院,南京市210098 [2]河海大学科学研究院,南京市210098

出　　处：《勘察科学技术》2009年第3期13-15,47,共4页Site Investigation Science and Technology

摘　　要：堆载预压法加固软土地基过程中,堆填速率将影响到超孔隙水压力的消散。基于比奥固结理论,结合某沿海围垦工程,建立了三维弹塑性有限元模型,模拟了土体固结过程。在此基础上,对土体固结过程中的超孔隙水压力变化进行了分析,并计算出土体的固结度。研究过程中,考虑了潮汐环境的影响及渗透系数在固结过程中随着土体孔隙比变化而产生的动态变化,验证了曼德尔效应的存在,认为潮汐环境的影响不容忽视。In the process of reinforcing soft soil foundation by preloading,preloading rate will impact on excess pore pressure dissipation.Based on Biot consolidation theory,combined with a certain project,a three-dimensional elastic -plastic FEM model is established,the process of soil consolidation is simulated.On the ground of the former results,changes of excess pore water pressure in the process of soil consolidation are analyzed,and the degree of consolidation is calculated.During the study,the tidal environment of coastal area and the change of permeability coefficient following the change of void ratio of soil in the process of consolidation are considered,Mandaer effect is verified.We hold that the influence of tidal environment is indispensable.

关 键 词：堆载预压法 比奥固结理论 固结度 曼德尔效应 

分 类 号：U656.2[交通运输工程—港口、海岸及近海工程] U652.2[交通运输工程—船舶与海洋工程]