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河海大学岩土力学与堤坝工程教育部重点实验室,江苏 南京 210098
Received:02 December 2022,
Revised:2023-02-16,
Published:15 December 2023
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卫仁杰,彭劼,陈泳等.MICP结合南海岛礁资源加固珊瑚砂的方法及效果研究[J].防灾减灾工程学报,2023,43(06):1255-1265.
WEI Renjie,PENG Jie,CHEN Yong,et al.Study on Methods and Effects of Coral Sand Reinforcement by MICP Combined with Reef Resources in South China Sea[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(06):1255-1265.
卫仁杰,彭劼,陈泳等.MICP结合南海岛礁资源加固珊瑚砂的方法及效果研究[J].防灾减灾工程学报,2023,43(06):1255-1265. DOI: 10.13409/j.cnki.jdpme.20221202002.
WEI Renjie,PENG Jie,CHEN Yong,et al.Study on Methods and Effects of Coral Sand Reinforcement by MICP Combined with Reef Resources in South China Sea[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(06):1255-1265. DOI: 10.13409/j.cnki.jdpme.20221202002.
为解决南海岛礁地基加固所需材料运输困难的问题,利用双极膜电渗析系统和海水生成盐酸,溶解岛礁上的珊瑚砂后得到MICP加固所需的自制钙源。然后通过自制钙源、化学纯钙源的MICP水溶液及砂柱加固对比试验,研究了自制钙源的适用性及加固效果。结果表明:通过双极膜电渗析装置可制得1.5 mol/L的盐酸,溶解珊瑚砂即可得到氯化钙纯度为94.9%以上的自制氯化钙溶液,其MICP水溶液试验的效果优于化学纯钙源组,自制钙源组的加固后砂柱强度均值为2.1 MPa,远高于化学纯钙源组的628 kPa。自制钙源中的镁、铝离子等能改变沉淀矿物形貌和成分,同时可生成更多的碳酸钙,使得自制钙源组加固砂柱的总体效果优于化学纯钙源组。
In order to solve the problem of difficult transportation of materials for the foundation reinforcement of islands and reefs in the South China Sea, this paper uses bipolar membrane electrodialysis system and seawater to generate hydrochloric acid that dissolves the coral sand on the islands and reefs, and obtain the self-made calcium source for the reinforcement of MICP. Then, the feasibility and reinforcement effect of self-made calcium source were studied through comparative tests of self-made calcium source, the chemically pure calcium source MICP aqueous solution, and sand column reinforcement. The research results show that: 1.5 mol/L hydrochloric acid can be prepared by the bipolar membrane electrodialysis device, and the self-made calcium chloride solution with a purity of 94.9% or more can be obtained by dissolving the coral sand. The effect of the MICP water solution test is better than that in both the chemically pure and the self-made calcium source group, with the average strength of the reinforced sand column being 2.1 MPa, significantly higher than the 640 kPa achieved by the chemically pure calcium source group. The magnesium and aluminum ions in the self-produced calcium source can change the morphology and composition of the precipitated minerals, while generating more calcium carbonate, making the self-produced calcium source group’s overall effect on strengthening the sand column superior to that of the chemically pure calcium source group.
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