软基处理中孔隙水消散规律的研究  

Research on the rule of pore water dissipation in treatment of soft foundation

作　　者：张向东[1] 张淑坤[1] 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000

出　　处：《水资源与水工程学报》2012年第2期40-43,共4页Journal of Water Resources and Water Engineering

基　　金：辽宁省教育厅科学技术研究重点实验室项目(2008S114);国家自然科学基金(50978131)资助

摘　　要：为研究饱和多孔土体在固结中孔隙水压力的变化特性,首先根据实际工程条件建立有限元模型,用模拟结果与原位测试结果进行对比,验证建立的模型准确性。然后应用该有限元模型设置相关条件,深入研究在外加荷载的情况下超孔隙水压力的变化规律。分析结果表明:随着时间的推移超孔压逐渐消散,365、90、25、18、8 d地基沉降值有明显回弹,而且这种现象距离荷载中心越远就越明显;超孔隙水压力变化敏感度跟排水有关,越接近排水面也就越敏感,越远则越迟钝。In order to study the change character of pore water pressure in saturated porous soil during the process of consolidation,a finite element model should be established according to the real engineering conditions.The model accuracy is verified by comparing the simulation results with the situ test results.Then using this finite element model to set related conditions,the paper deeply researched the change regularity of the excess pore water pressure under the load applied.The analysis results showed that due to the evanishment of excess pore pressure with the passage of time,after 365,90,25,18,8 days the foundation settlement values had obvious rebound,and the farther the distance to the load center,the more obvious this phenomenon was,the changed sensitivity of excess pore water pressure was connected with the drainage,the closer to the drainage surface,the more sensitive the change was,and the farther to the drainage surface,the more dull the change was.

关 键 词：孔隙水压力 有限元 地基 固结沉降 

分 类 号：TU471.8[建筑科学—结构工程]