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微生物诱导碳酸钙沉淀结合活性炭改良盐渍土的压缩与持水特性

Compression and water retention behavior of saline soil improved by MICP combined with activated carbon.

作者信息

Zhang Ming-Shuai, Chiu Chung-Fai, Zhou Yi-Zhe, Wang Yan-Ning

机构信息

Department of Civil and Smart Construction Engineering, Shantou University, Shantou, 515063, Guangdong, China.

出版信息

Sci Rep. 2024 Dec 28;14(1):31484. doi: 10.1038/s41598-024-83083-2.

DOI:10.1038/s41598-024-83083-2
PMID:39733155
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11682071/
Abstract

Saline soil is widely distributed in China and poses significant challenges to engineering construction due to its harmful effects, such as salt heaving, dissolution collapse, and frost heaving. The Microbial-Induced Calcite Precipitation (MICP) method is an emerging environmental-friendly modification that can reduce or eliminate the environmental and engineering hazards of saline soil. To verify the feasibility of the MICP method for improving the properties of saline soil, laboratory tests were conducted to study the effects of salt content, activated carbon content and freeze-thaw cycles on the compression and water retention behavior of MICP modified saline soil. The following conclusions were drawn: calcium carbonate produced from the MICP can cement the soil particles of the modified soil structures, which resists the expansion damage caused by salt frost heaving and reduces soil compressibility. Additionally, calcium carbonate particles can fill pores of the soil structures, which improves the water retention capacity of the modified saline soil. The addition of activated carbon can enhance the MICP reaction leading to further reduction in compressibility and enhancement in water retention capacity of MICP modified saline soil.

摘要

盐渍土在中国分布广泛，因其盐胀、溶解塌陷和冻胀等有害影响，给工程建设带来重大挑战。微生物诱导碳酸钙沉淀（MICP）方法是一种新兴的环保改良方法，可减少或消除盐渍土的环境和工程危害。为验证MICP方法改善盐渍土性质的可行性，开展了室内试验，研究含盐量、活性炭含量和冻融循环对MICP改良盐渍土压缩性和持水性能的影响。得出以下结论：MICP产生的碳酸钙可胶结改良土结构中的土颗粒，抵抗盐冻胀引起的膨胀破坏并降低土的压缩性。此外，碳酸钙颗粒可填充土结构孔隙，提高改良盐渍土的持水能力。添加活性炭可增强MICP反应，进一步降低MICP改良盐渍土的压缩性并提高其持水能力。

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