摘要
针对传统真空预压排水板淤堵导致真空度传递效率降低,影响深部土体加固效果的问题,开发一种反向排水板真空预压软土地基加固方法,探究其深部土体加固效果。开展传统真空预压、反向排水板真空预压、正反向排水板真空预压室内物理模型试验,分析真空度、排水量、沉降量、加固后土体含水率、不排水剪切强度、固结度等指标的变化规律,证明反向排水板真空预压法对深部土体加固效果的有效性。结果表明,与传统真空预压相比,反向排水板和正反向排水板真空预压真空度提高6.5%和19.3%,排水量增大9.19%和19.7%,沉降量增加17.55%和20.61%,加固后土体含水率降低至30%~36%和21%~25%,不排水剪切强度提高1.33倍和2.21倍,最终平均固结度可达92.58%和99.03%。
In response to the clogging of prefabricated vertical drain(PVD)for traditional vacuum preloading,which reduces the efficiency of vacuum degree transmission and affects the reinforcement effect of deep ground,a reverse PVD vacuum preloading method was developed to investigate its deep soil reinforcement effect.Laboratory physical model tests on traditional vacuum preloading,reverse PVD vacuum preloading,and forward and reverse PVD vacuum preloading was conducted.The changes in indicators were analyzed,such as vacuum degree,water discharge,settlement,water content after reinforcement,undrained shear strength after reinforcement,and consolidation degree,and proved the effectiveness of the reverse PVD vacuum preloading method in strengthening deep soil.The results show that compared with traditional vacuum preloading,the vacuum degree of reverse PVD and forward and reverse PVD vacuum preloading increase by 6.5%and 19.3%,the water discharge increases by 9.19%and 19.7%,and the settlement amount enlargee by 17.55%and 20.61%.After reinforcement,the water content decreases to 30%~36%and 21%~25%,and the undrained shear strength increases by 1.33 times and 2.21 times.The final average consolidation degree can reach 92.58%and 99.03%.
作者
雷华阳
冯双喜
王雅申
虎圣翰
李威
刘嘉城
常哲皓
LEI Huayang;FENG Shuangxi;WANG Yashen;HU Shenghan;LI Wei;LIU Jiacheng;CHANG Zhehao(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety of the Ministry of Education,Tianjin University,Tianjin 300350,China)
出处
《广西大学学报(自然科学版)》
北大核心
2025年第5期938-949,共12页
Journal of Guangxi University(Natural Science Edition)
基金
国家自然科学基金项目(52108336)
天津市自然科学基金项目(22JCQNJC00130)
天津大学大学生创新训练项目(2024-B-3)。
关键词
真空预压
软土地基
反向排水板
模型试验
加固效果
vacuum preloading
soft ground
reverse prefabricated vertical drain
model experiment
reinforcement effect
