{"title":"微生物诱导方解石沉淀（MICP）处理岩石裂隙抗剪强度研究","authors":"Shuang Li, Yeshan Fu, Weimin Xiao","doi":"10.1007/s12665-025-12524-6","DOIUrl":null,"url":null,"abstract":"<div><p>Microbially Induced Calcite Precipitation (MICP) has emerged as an ecologically friendly geotechnical technology widely applied for soil reinforcement. Although there had been quite a few researches on the application of MICP method for reducing the permeability of rock fracture, researches on the shear strength of rock fracture reinforcement by MICP method had been rarely reported. In this study, artificial rock fracture specimens with the morphology characteristics of the 2nd, 5th and 8th Barton’s standard profiles were prepared by using cement slurry rock-like material, and the artificial specimens were reinforced by both MICP method and cement slurry grouting. Then direct shear tests under three levels of normal stress were conducted on MICP-treated artificial rock fracture specimens, as well as uncemented and cement-slurry-treated specimens. By comparing with uncemented and cement-slurry-treated rock fractures, the influences of surface roughness, CaCO<sub>3</sub> layer thickness, and CaCO<sub>3</sub> layer curing time on the shear strength of MICP-treated rock fracture were investigated. The results revealed that the peak shear strength of MICP-treated rock fracture increased with CaCO<sub>3</sub> layer curing time, and corresponding cohesions and friction angles increased with surface roughness when the CaCO<sub>3</sub> layer curing time and thickness were the same. Additionally, when the CaCO<sub>3</sub> layer curing time were 28d and 60d, the peak shear strengths of MICP-treated rock fractures were greater than or close to that of cement-slurry-treated rock fracture specimens if the surface surface was rather rough, and it also appeared to increase with CaCO<sub>3</sub> layer thickness as a result of the cohesive CaCO<sub>3</sub> layer filled in MICP-treated rock fracture. Furthermore, shear failure of both MICP-treated and cement-slurry-treated rock fracture firstly occurred along the interface between fracture surface and infill layer, and then the asperities were involved to form a mixture contact of rock-infill and rock-rock during subsequent shear process.</p></div>","PeriodicalId":542,"journal":{"name":"Environmental Earth Sciences","volume":"84 20","pages":""},"PeriodicalIF":2.8000,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Investigation on the shear strength of microbially induced calcite precipitation (MICP) treated rock fractures\",\"authors\":\"Shuang Li, Yeshan Fu, Weimin Xiao\",\"doi\":\"10.1007/s12665-025-12524-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Microbially Induced Calcite Precipitation (MICP) has emerged as an ecologically friendly geotechnical technology widely applied for soil reinforcement. Although there had been quite a few researches on the application of MICP method for reducing the permeability of rock fracture, researches on the shear strength of rock fracture reinforcement by MICP method had been rarely reported. In this study, artificial rock fracture specimens with the morphology characteristics of the 2nd, 5th and 8th Barton’s standard profiles were prepared by using cement slurry rock-like material, and the artificial specimens were reinforced by both MICP method and cement slurry grouting. Then direct shear tests under three levels of normal stress were conducted on MICP-treated artificial rock fracture specimens, as well as uncemented and cement-slurry-treated specimens. By comparing with uncemented and cement-slurry-treated rock fractures, the influences of surface roughness, CaCO<sub>3</sub> layer thickness, and CaCO<sub>3</sub> layer curing time on the shear strength of MICP-treated rock fracture were investigated. The results revealed that the peak shear strength of MICP-treated rock fracture increased with CaCO<sub>3</sub> layer curing time, and corresponding cohesions and friction angles increased with surface roughness when the CaCO<sub>3</sub> layer curing time and thickness were the same. Additionally, when the CaCO<sub>3</sub> layer curing time were 28d and 60d, the peak shear strengths of MICP-treated rock fractures were greater than or close to that of cement-slurry-treated rock fracture specimens if the surface surface was rather rough, and it also appeared to increase with CaCO<sub>3</sub> layer thickness as a result of the cohesive CaCO<sub>3</sub> layer filled in MICP-treated rock fracture. Furthermore, shear failure of both MICP-treated and cement-slurry-treated rock fracture firstly occurred along the interface between fracture surface and infill layer, and then the asperities were involved to form a mixture contact of rock-infill and rock-rock during subsequent shear process.</p></div>\",\"PeriodicalId\":542,\"journal\":{\"name\":\"Environmental Earth Sciences\",\"volume\":\"84 20\",\"pages\":\"\"},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2025-10-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Environmental Earth Sciences\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s12665-025-12524-6\",\"RegionNum\":4,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Earth Sciences","FirstCategoryId":"93","ListUrlMain":"https://link.springer.com/article/10.1007/s12665-025-12524-6","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
Investigation on the shear strength of microbially induced calcite precipitation (MICP) treated rock fractures
Microbially Induced Calcite Precipitation (MICP) has emerged as an ecologically friendly geotechnical technology widely applied for soil reinforcement. Although there had been quite a few researches on the application of MICP method for reducing the permeability of rock fracture, researches on the shear strength of rock fracture reinforcement by MICP method had been rarely reported. In this study, artificial rock fracture specimens with the morphology characteristics of the 2nd, 5th and 8th Barton’s standard profiles were prepared by using cement slurry rock-like material, and the artificial specimens were reinforced by both MICP method and cement slurry grouting. Then direct shear tests under three levels of normal stress were conducted on MICP-treated artificial rock fracture specimens, as well as uncemented and cement-slurry-treated specimens. By comparing with uncemented and cement-slurry-treated rock fractures, the influences of surface roughness, CaCO3 layer thickness, and CaCO3 layer curing time on the shear strength of MICP-treated rock fracture were investigated. The results revealed that the peak shear strength of MICP-treated rock fracture increased with CaCO3 layer curing time, and corresponding cohesions and friction angles increased with surface roughness when the CaCO3 layer curing time and thickness were the same. Additionally, when the CaCO3 layer curing time were 28d and 60d, the peak shear strengths of MICP-treated rock fractures were greater than or close to that of cement-slurry-treated rock fracture specimens if the surface surface was rather rough, and it also appeared to increase with CaCO3 layer thickness as a result of the cohesive CaCO3 layer filled in MICP-treated rock fracture. Furthermore, shear failure of both MICP-treated and cement-slurry-treated rock fracture firstly occurred along the interface between fracture surface and infill layer, and then the asperities were involved to form a mixture contact of rock-infill and rock-rock during subsequent shear process.
期刊介绍：
Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth:
Water and soil contamination caused by waste management and disposal practices
Environmental problems associated with transportation by land, air, or water
Geological processes that may impact biosystems or humans
Man-made or naturally occurring geological or hydrological hazards
Environmental problems associated with the recovery of materials from the earth
Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources
Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials
Management of environmental data and information in data banks and information systems
Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment
In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.
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