真空预压排水机制室内模型试验研究  

Laboratory study on drainage mechanism of vacuum preloading method

作　　者：张仪萍[1] 李剑[1,2] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]张家港市建筑工务处,江苏张家港215600

出　　处：《浙江大学学报（工学版）》2014年第4期679-685,共7页Journal of Zhejiang University：Engineering Science

基　　金：浙江省重点科技创新团队计划资助项目(2010R50037)

摘　　要：针对砂性土设计3组真空预压室内模型试验,探讨真空预压过程中存在的排水机制,分析不同因素对排水机制的影响.试验结果表明,在真空预压过程中,除固结排水外,溶解气膨胀驱水也是一种重要的排水机制,而蒸发所引起的排水可以忽略不计.试样孔隙大小、水中溶解气含量是影响溶解气膨胀驱水效果的主要因素,孔隙过大或过小都会削弱溶解气膨胀驱水的作用,溶解气含量越大,则溶解气的膨胀驱水效果越好.Three groups of model tests were conducted for sandy soil to investigate the drainage mechanism in vacuum preloading and analyze the influence of different factors on the drainage effect. Experimental results show that the drainage by expansion of solution gas is also an important drainage mechanism in addition to the drainage by consolidation, but the drainage by vaporization can be ignored. The pore size and the content of dissolved gas greatly influence the drainage by expansion of solution gas. Pore size is too big or too small can weaken the drainage effect induced by expansion solution gas. The larger the content of dissolved gas is, the more the water drained out is.

关 键 词：真空预压 排水机制 溶解气膨胀驱水 

分 类 号：TU447[建筑科学—岩土工程]