摘要
针对增压式真空预压法加固超软土过程中气体运移路径和加固作用机制认识不统一的问题,设计进行探究气体运移路径的增压式真空预压试验和增压式真空预压水平排水板试验。通过对比分析土体排水量、孔隙水压力值、沉降量、十字板剪切强度和含水率等试验结果,得到以下结论:增压式真空预压加固超软土过程中,进行注气操作后气体首先向土体表面方向运移。同时,结合注气操作时的实时孔压变化情况,分析认为注气操作提升土体排水固结效果的主要作用机制为:进行注气操作时,增压气体的上升会带动深层孔隙水向浅层运移,使深层孔隙水在浅层被排水板快速吸收并排出,以此提高深层土体加固效果和整体排水效率。
At present,the academic circles have different understanding of the gas migration path after gas injection operation and reinforcement mechanism of air-booster vacuum preloading.In view of this problem,several groups of air-booster vacuum preloading model experiments were designed to explore the gas migration path after gas injection operation and reinforcement mechanism of air-booster vacuum preloading.By comparing and analyzing the test results of drainage,pore water pressure,settlement,vane shear strength and water content,the following conclusions were obtained:in the process of treating ultra-soft soil by air-booster vacuum preloading,the gas moves to the soil surface first after gas injection.At the same time,by considering the real-time pore pressure change during gas injection operation,it is speculated that the main mechanism of gas injection operation to improve the drainage and consolidation effect of soil is as follows:during gas injection operation,the rise of pressurized gas will drive the deep pore water to migrate to the shallow layer,so that the deep pore water can be quickly absorbed and discharged by the drainage plate in the shallow layer,so as to improve the reinforcement effect of deep soil and the overall drainage efficiency.
作者
刘景锦
李建楷
雷华阳
LIU Jingjin;LI Jiankai;LEI Huayang(Department of Civil Engineering,Tianjin University,Tianjin 300354,China;Key Laboratory of Coast Civil Structure Safety of Ministry of Education,Tianjin University,Tianjin 300354,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2023年第S01期3598-3608,共11页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51908406,52078334)
河海大学岩土力学与堤坝工程教育部重点实验室开放基金项目(20200022)
关键词
土力学
真空预压
增压法
气体运移
加固机制
soil mechanics
vacuum preloading
air-booster vacuum preloading
gas migration
reinforcement mechanism
作者简介
刘景锦(1988-),女,2017年于天津大学岩土工程专业获博士学位,现任高级工程师,主要从事岩土工程等方面的教学与研究工作。E-mail:liujingjinljj@163.com;通讯作者:雷华阳(1974-),女,现任教授、博士生导师。E-mail:leihuayang74@163.com
