摘要
尽管微生物诱导碳酸钙沉积(Microbially Induced Calcite Precipitation,简称MICP)技术已在岩土体加固领域广泛应用,但针对MICP酸性侵蚀耐久性的研究成果鲜见报导。为此,通过开展不同pH值(pH=4,5和7)和侵蚀时间(7d,14d和28d)下的MICP封堵3D打印类岩石节理试件酸性侵蚀试验,研究岩石节理中碳酸钙封堵层溶蚀情况及其在酸性侵蚀前后的渗透性演化规律。试验结果表明:MICP封堵岩石节理试件中碳酸钙溶蚀量随侵蚀溶液pH值减小而增大,且随侵蚀时间增长而增大,碳酸钙溶蚀区域主要集中在试件四周边缘附近区域;MICP封堵前后岩石节理试件渗透系数平均降幅为97%,经酸性侵蚀后其渗透系数有略微回升,但相应的渗透系数降幅均大于95%,MICP封堵岩石节理试件经酸性侵蚀后其封堵效果依旧良好。研究成果可为MICP技术在岩体工程中的应用提供科学依据。
The microbially induced calcite precipitation(MICP)method has been widely used for rock mass and soil reinforcement,but the researches on its acid erosion durability are rarely reported.Therefore,the acid erosion tests on the MICP-treated artificial rock joint specimens are performed by considering different erosion solution pH values(4,5 and 7)and erosion time(7,14 and 28 d),then the dissolution of calcium carbonate within the specimens and the corresponding permeability evolution are investigated.The experimental results show that the amount of dissolved calcium carbonate in the specimens increases with the decrease of the erosion solution pH values and erosion time,and the calcium carbonate dissolution mainly occurs at the peripheral area around the specimen edges.Moreover,the average permeability of rock joint specimens decreases by 97%after the MICP treatment.Though the permeability of the MICP-treated rock joint specimens restores slightly after acid erosion,the permeability decrease is still more than 95%compared with that of the rock joint specimens before the MICP treatment,which indicates that the effects of the MICP method on sealing rock joints are good after acid erosion.The achievements can provide scientific bases for the application of the MICP technology for rock fracture sealing in rock mass projects.
作者
肖维民
翁金耀
钟建敏
朱占元
XIAO Weimin;WENG Jinyao;ZHONG Jianmin;ZHU Zhanyuan(School of Civil Engineering,Sichuan Agricultural University,Dujiangyan 611830,China;Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction,Sichuan Agricultural University,Dujiangyan 611830,China;Jiangxi Youse Construction(Group)Co.,Ltd.,Nanchang 330038,China;School of Civil and Hydraulic Engineering,Xichang University,Xichang 615013,China)
出处
《岩土工程学报》
EI
CAS
北大核心
2025年第1期217-224,共8页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金面上项目(41877195)。
