传统与分级真空预压的模型试验研究  

A Model Test Study on Traditional and Staged Vacuum Preloading

作　　者：熊站 汪明元 严乾 王友博 王亚军 祝幸 李强 王治云 XIONG Zhan;WANG Ming-yuan;YAN Qian;WANG You-bo;WANG Ya-jun;ZHU Xing;LI Qiang;WANG Zhi-yun(Harbor and traffic engineering portage College,Zhejiang Ocean University,Zhoushan 316022,China;Hydro China Huadong Engineering Corporation,Hangzhou 310012,China;Country Garden Holdings,Foshan 528000,China;Zhoushan New Ocean Geotechnical Engineering Co.,Ltd,Zhoushan 316022,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 [3]碧桂园集团,广东佛山528000 [4]舟山市新海洋岩土工程有限公司,浙江舟山316022

出　　处：《海岸工程》2018年第3期43-49,共7页Coastal Engineering

基　　金：国家自然科学基金项目--基于模糊随机损伤力学的混凝土高坝抗震安全评价研究(51109118);中国电建集团华东水利水电勘测设计研究院基础研究课题--围海造路工程中大规模吹填泥浆快速排水固结技术的模型试验与研究(21188006615)

摘　　要：为了将真空预压排水固结技术应用到舟山围海造陆工程实践中,以长峙岛海域海相软土为实验原材料,通过室内模型试验,探讨了传统真空预压与分级真空预压处理的效果。结果表明:传统真空预压中由于土体细小土颗粒的迁移导致排水板发生淤堵,而分级真空预压由于低真空产生的渗流力较小,土颗粒难以发生迁移而形成稳定的结构,一定程度上减缓排水板发生淤堵。在本次真空预压作用时间内,分级真空预压比传统真空预压的排水固结效果更好,预压后土体的沉降量更大、含水率更小,后期处理效果更好。此外,提出的固结度-时间公式对预测土体的固结度具有一定的价值。In order to apply vacuum preloading drainage consolidation technology to the practice of reclamation land in Zhoushan, the treatment effects of traditional and staged vacuum preloading are discussed by taking the marine soft soil in the Changchi Island as the experimental raw material and carrying out model test in the laboratory. The main conclusions are as the followings： the traditional vacuum preloading may cause the clogging of drainage board due to the migration of fine particles in the soil; while the staged vacuum preloading can, to a certain extent, reduce the clogging of drainage board because the soil particles are difficult to migrate due to the small seepage force produced by low vacuum and form a stable structure. Within the preloading time of this model test, the staged vacuum preloading produces a better effect of drainage consolidation than the traditional one, showing that after the preloading the soil body is larger in the amount of settlement, smaller in the rate of water content and better in the effect of post-treatment. In addition, the formula of consolidation degree-time proposed in the paper has a certain value in predicting the consolidation degree of soil.

关 键 词：真空预压 海相软土 分级真空预压 淤堵 

分 类 号：TU43[建筑科学—岩土工程]