以某在产企业损伤阻污承载结构表层和基层协同修复为目标,融合结构的高程、回弹模量及挥发性有机物浓度等原位测试,以及结构样芯抗压强度、透水系数等室内测试,系统研究了阻污承载结构修复后污染迁移阻控、承受外界荷载性能的变化规律.结果表明:阻污承载结构修复后,结构表层最大与最小高程之差减小71.4%,结构平整度提升;试验区14个测试点位中占比42.9%的点位回弹模量值恢复到对照区相应测试值的80%以上,试验区表层平均宽度7.5mm裂缝处采集岩芯的轴心抗压强度提升约0.38倍,基层贯入阻力提升约21.3%,结构承载性能改善;试验区表层平均宽度7.5mm裂缝处采集样芯的透水系数降低约2个数量级,表层采样孔内挥发性有机污染物浓度降低80%,结构阻污性能增强.研究结果为在产企业损伤阻污承载结构的服役状态监测与快速修复提供新思路.
Abstract
This study was aimed to rapidly remediate the cracked contaminant containment and carrying structure (3C structure) and carrying structure by composite contaminant containment and carrying structure (4C structure) in operating plant. To assess the effectiveness of the 4C structure, both field and laboratory tests were performed. Field tests included elevation monitoring, rebound modulus testing, and volatile organic compounds (VOCs) concentration detection, while laboratory tests focused on determining the compressive strength and permeability coefficient of the core samples. The results indicated that the injected polymers exert a compressive force on the surface layer of 4C structure, which reduces the elevation variance by 71.4%, thereby markedly enhancing its flatness. Additionally, regarding the 14 filed test points on the surface layer with an average crack width of 7.5mm, the rebound modulus (E) values at 42.9% of these test points achieved over 80% of E value measured within the uncracked control area. The axial compressive strength of core samples from these points increased by 0.38 times, and the penetration resistance of the base soil layer increased by 21.3%. These results suggested a significant improvement in the load-carrying performance of 4C structure compared with the cracked 3C structure. Furthermore, the permeability coefficient of the core samples was reduced by approximately 2orders of magnitude, and the VOCs concentration in the sampling holes decreased by 80%. This demonstrated the contaminant containment performance of 4C structure was also significantly improved. This research provided an innovative method to assess and improve the service performance of cracked contaminant containment and carrying structure in operating plant.
关键词
服役性能 /
快速修复 /
现场试验 /
在产企业 /
阻污承载结构
Key words
contaminant containment and carrying structure /
operating plant /
polit test /
rapid repair /
service performance
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基金
江苏省环境工程重点实验室自主课题(ZX2023003);国家重点研发计划项目(2019YFC1804000,2022YFC3702500);中国博士后科学基金项目(2022M711397,2024T170359)
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