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| Field study on rapid remediation of cracked contaminant containment and carrying structure in operating plant |
| FENG Ya-song1,2, WANG Shui1,2, LI Meng-ya1,2, LYU Zong-xiang1,2, CHEN Yu-tao1, YIN Zhi-hua1,2, BAI Li-sen1,2 |
1. Jiangsu Provincial Key Laboratory of Environmental Engineering, Jiangsu Provincial Academy of Environmental Science, Nanjing 210036, China;
2. Jiangsu Province Engineering Research Centre of Soil and Groundwater Pollution Prevention and Control, Nanjing 210036, China |
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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.
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Received: 16 July 2024
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