{"title":"MICP处理对原状沙质黄土水力特性的影响","authors":"Chenchen Huang, Qiang Du, Liqiang Qu, Jialin Xue","doi":"10.1007/s10064-025-04421-w","DOIUrl":null,"url":null,"abstract":"<div><p>This study explored Microbial-induced carbonate precipitation (MICP) technology to address the poor water stability and low cohesion of natural sandy loess, which is prone to geological hazards. Three calcium sources (calcium chloride, calcium acetate, calcium lactate) were used to treat small-scale samples under varying soaking durations. Results from disintegration, collapsibility, permeability, and strength tests revealed distinct performance differences. Calcium acetate-treated samples achieved an 86.7% reduction in disintegration after 7 days, outperforming other calcium sources. Both calcium chloride and calcium acetate-treated samples reduced collapsibility by > 90% within 3 days. Permeability coefficients decreased by one order of magnitude after 3 days and by 2 ~ 3 orders after 7 days for calcium acetate and calcium lactate treated samples. However, the unconfined compressive strength (UCS) of MICP-treated samples remained only 72 ~ 88% of untreated samples post-treatment, attributed to structural disruption from excessive water during MICP application. While MICP significantly enhanced water stability, the process weakened intrinsic soil structure, leading to lower mechanical strength despite improved erosion resistance. These findings highlight MICP’s potential for mitigating sandy loess hazards but underscore the need to balance water stability enhancement with structural integrity preservation in practical applications.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"84 8","pages":""},"PeriodicalIF":4.2000,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of MICP treatment on hydraulic characteristics of undisturbed sandy loess\",\"authors\":\"Chenchen Huang, Qiang Du, Liqiang Qu, Jialin Xue\",\"doi\":\"10.1007/s10064-025-04421-w\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>This study explored Microbial-induced carbonate precipitation (MICP) technology to address the poor water stability and low cohesion of natural sandy loess, which is prone to geological hazards. Three calcium sources (calcium chloride, calcium acetate, calcium lactate) were used to treat small-scale samples under varying soaking durations. Results from disintegration, collapsibility, permeability, and strength tests revealed distinct performance differences. Calcium acetate-treated samples achieved an 86.7% reduction in disintegration after 7 days, outperforming other calcium sources. Both calcium chloride and calcium acetate-treated samples reduced collapsibility by > 90% within 3 days. Permeability coefficients decreased by one order of magnitude after 3 days and by 2 ~ 3 orders after 7 days for calcium acetate and calcium lactate treated samples. However, the unconfined compressive strength (UCS) of MICP-treated samples remained only 72 ~ 88% of untreated samples post-treatment, attributed to structural disruption from excessive water during MICP application. While MICP significantly enhanced water stability, the process weakened intrinsic soil structure, leading to lower mechanical strength despite improved erosion resistance. These findings highlight MICP’s potential for mitigating sandy loess hazards but underscore the need to balance water stability enhancement with structural integrity preservation in practical applications.</p></div>\",\"PeriodicalId\":500,\"journal\":{\"name\":\"Bulletin of Engineering Geology and the Environment\",\"volume\":\"84 8\",\"pages\":\"\"},\"PeriodicalIF\":4.2000,\"publicationDate\":\"2025-07-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Bulletin of Engineering Geology and the Environment\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10064-025-04421-w\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, ENVIRONMENTAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of Engineering Geology and the Environment","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10064-025-04421-w","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
Effect of MICP treatment on hydraulic characteristics of undisturbed sandy loess
This study explored Microbial-induced carbonate precipitation (MICP) technology to address the poor water stability and low cohesion of natural sandy loess, which is prone to geological hazards. Three calcium sources (calcium chloride, calcium acetate, calcium lactate) were used to treat small-scale samples under varying soaking durations. Results from disintegration, collapsibility, permeability, and strength tests revealed distinct performance differences. Calcium acetate-treated samples achieved an 86.7% reduction in disintegration after 7 days, outperforming other calcium sources. Both calcium chloride and calcium acetate-treated samples reduced collapsibility by > 90% within 3 days. Permeability coefficients decreased by one order of magnitude after 3 days and by 2 ~ 3 orders after 7 days for calcium acetate and calcium lactate treated samples. However, the unconfined compressive strength (UCS) of MICP-treated samples remained only 72 ~ 88% of untreated samples post-treatment, attributed to structural disruption from excessive water during MICP application. While MICP significantly enhanced water stability, the process weakened intrinsic soil structure, leading to lower mechanical strength despite improved erosion resistance. These findings highlight MICP’s potential for mitigating sandy loess hazards but underscore the need to balance water stability enhancement with structural integrity preservation in practical applications.
期刊介绍：
Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces:
• the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations;
• the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change;
• the assessment of the mechanical and hydrological behaviour of soil and rock masses;
• the prediction of changes to the above properties with time;
• the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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