摘要
近年来,中国沿海城市随水利工程开发产生大量的疏浚淤泥地基。疏浚淤泥工程性质差,需经处理后才能开展道路建设。广泛使用的传统真空预压法因淤堵等问题导致处理疏浚淤泥地基的效果不佳,改进后的水平联合竖直排水板法仍存在后期加固效果不足、易发生淤堵等问题。为进一步改善水平联合竖直排水板真空预压法加固效果的影响,提出了在真空预压过程中周期性地通入空气以促进排水的新思路,即PHD&PVD真空预压联合通气法。通过自制玻璃模型箱开展了4组室内模型试验,监测疏浚淤泥加固过程中的排水量、孔隙水压力、表层沉降以及试验后土体的含水率、抗剪强度等参数,对比分析了不同通气持续时间对PHD&PVD真空预压联合通气法加固疏浚淤泥效果的影响。试验结果表明:相较于常规PHD&PVD真空预压组,间歇通气PHD&PVD真空预试验组处理疏浚淤泥排水量提高了6.60%~14.03%,沉降量增大了9.30%~25.66%,十字板剪切整体平均强度提高10.08%~29.74%,其中以通气模式为1 h·d^(-1)固结效果最佳;相较于常规PHD&PVD真空预压法,加入通气步骤可有效减缓排水板附近的淤堵现象,从而提高固结效率。此外,微观试验也证实间歇通气可有效地缓解疏浚淤泥颗粒向排水板处聚集的问题,提高了疏浚淤泥的加固效果。研究验证了PHD&PVD真空预压联合通气法的有效性,有助于未来疏浚淤泥处理技术的发展和应用。
In recent years,with the development of water conservation projects,a large number of dredged silt foundations have been generated in coastal cities in China.Dredged silt has poor engineering properties and requires treatment prior to its use in construction.The widely used traditional vacuum-preloading method has poor effectiveness in treating dredged silt foundations owing to issues such as clogging.The improved horizontal combined vertical drainage plate(PHD&PVD)method has problems such as an insufficient reinforcement effect and clogging in the last duration.To further improve the reinforcement effect of the PHD and PHD&PVD vacuum preloading method,this study proposes a new method in which air is periodically introduced during the vacuum preloading process to promote drainage.It is called the PHD and PHD&PVD vacuum preloading-aeration method.Four sets of indoor model experiments were conducted using self-made glass model boxes.Parameters such as drainage volume,pore water pressure,and surface settlement were monitored during the tests,and the soil moisture content and shear strength were tested after treatment.The effects of different ventilation durations on the reinforcement of dredged silt using the PHD and PHD&PVD vacuum preloading-aeration method were compared and analyzed.The experimental results show that,compared with the conventional PHD and PHD&PVD vacuum preloading,the intermittent ventilation PHD and PHD&PVD vacuum preloading group increased the discharge of dredged silt by 6.60%to 14.03%,the settlement increased by 9.30%to 25.66%,and the overall average shear strength of the cross plate increased by 10.08%to 29.74%.The best consolidation effect was achieved when air was introduced for 1 h/day.Compared to the conventional PHD and PHD&PVD vacuum preloading method,the clogging phenomenon near the drain can be effectively reduced,and the consolidation efficiency is improved.In addition,micro-experiments confirmed that intermittent ventilation can effectively alleviate the problem of particle accumulation around the drain and improve the reinforcement effect of dredged silt.This study verified the effectiveness of the PHD and PHD&PVD vacuum preloading-aeration method,which will aid in the future development and application of dredging silt treatment technologies.
作者
高紫阳
王浩然
符洪涛
王军
李校兵
金锦强
吕有畅
GAO Zi-yang;WANG Hao-ran;FU Hong-tao;WANG Jun;LI Xiao-bing;JIN Jin-qiang;LYU You-chang(School of Civil Engineering and Architecture,Wenzhou University,Wenzhou 325035,Zhejiang,China;Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province,Wenzhou 325035,Zhejiang,China;Collaborative Innovation Center of Tideland Reclamation and Ecological Protection,Wenzhou 325035,Zhejiang,China;Wenzhou Oufei Development and Construction Investment Group Co.Ltd.,Wenzhou 325035,Zhejiang,China)
出处
《中国公路学报》
北大核心
2025年第2期137-146,共10页
China Journal of Highway and Transport
基金
国家自然科学基金杰出青年科学基金项目(52325806)
国家自然科学基金项目(52178348,52178350,42407208)
浙江省自然科学基金项目(LY20E080029)
温州市科技项目(ZS2023005,S2023002,G20240032)温州市科协服务科技创新项目(KJFW2024-070)。
关键词
路基工程
疏浚淤泥
真空预压联合通气法
通气时长
排水板淤堵
subgrade engineering
dredged slurry
vacuum preloading-aeration method
aeration duration
drainage plate clogging
作者简介
高紫阳(1994-),男,安徽池州人,讲师,工学博士,E-mail:gaoziyang2022@163.com;通信作者:王军(1980-),男,辽宁盘锦人,教授,工学博士,E-mail:sunnystar1980@163.com。
