间歇式分级真空预压的模型试验  

Model test on intermittent grading vacuum preloading

作　　者：熊站 汪明元 陈晶金 单治钢 严乾 王亚军 XIONG Zhan;WANG Ming-yuan;CHEN Jing-jin;SHAN Zhi-gang;YAN Qian;WANG Ya-jun(Harbor and Traffic Engineering Portage College,Zhejiang Ocean University,Zhoushan,Zhejiang 316022,China;Power China Huadong Engineering Co.,Ltd.,Hangzhou,Zhejiang 311122,China)

机构地区：[1]浙江海洋大学港航与交通运输工程学院,浙江舟山316022 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122

出　　处：《中国港湾建设》2019年第3期20-23,66,共5页China Harbour Engineering

基　　金：国家自然科学基金(51109118);浙江省自然科学基金(LY14E090001);清华大学水沙科学与水利水电工程国家重点实验室开放基金(sklhse-2018-E-03);中国电建集团华东勘测设计研究院有限公司基础研究课题(21188006615)

摘　　要：针对实际工程真空预压加固过程中排水板容易淤堵的问题,提出了间歇式分级真空预压的方法,即分级施加真空荷载,间歇式抽真空。经过室内模型试验,结果表明:卸载真空后,土体在自重固结作用下有新的孔隙水析出,淤堵的泥层结构在孔隙水的浸湿下受损,滤膜的渗透系数变大。此外,重新施加真空后,强大吸力的产生使土体骨架发生了破坏与重组,形成新的渗流连通通道,有助于孔隙水的排出。Aiming at the actual engineering problem that drainage pipes are clogged easily during vacuum preloading reinforcement process,a intermittent grading vacuum preloading method is proposed,namely the vacuum load is applied in stages,and the vacuum is intermittently applied.After an indoor model test,the results show that:after the vacuum is unloaded, the soil has new pore water sedimentation under the self-weight consolidation,and the muddy layer structure is damaged under the wet water of the pore water,so the permeability coefficient of the filter becomes larger.In addition,after the vacuum is applied again,the strong suction force causes the soil skeleton to be destroyed and reorganized,forming a new seepage communication channel,which contributes to the discharge of pore water.

关 键 词：海相软土 间歇式 分级真空预压 淤堵 

分 类 号：U655.544.4[交通运输工程—港口、海岸及近海工程] TU472.33[交通运输工程—船舶与海洋工程]