Precipitation distribution characteristics of microbial mineralization sealing rock mass fractures on permeability
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摘要: 地下水封油库对洞室渗水量有严格的要求，需进行注浆渗控。微生物诱导碳酸钙沉淀（MICP）生成的微生物水泥具有浆液颗粒小、黏度低、流动性好等优点，为封堵岩体微裂隙提供了新的思路。微生物矿化注浆封堵岩体裂隙降渗过程包含了微生物水解尿素、矿化沉淀反应以及沉淀在裂隙中附着和分布等一系列反应。本文首先阐述了微生物矿化反应基本原理，基于目前研究和应用最为广泛的脲酶水解尿素反应方式介绍其生物酶催化作用，然后通过分析脲酶水解尿素反应过程中生成的沉淀对裂隙隙宽的影响，推导了矿化反应沉淀在裂隙中不同的附着特征对裂隙渗透性降低的理论公式，同时相应地分析了影响效果。本文旨在通过了解微生物矿化封堵岩体裂隙降渗过程中耦合关系，为后续微生物矿化封堵岩体裂隙降渗机制研究提供理论基础。Abstract: Groundwater-sealed oil depots have stringent requirements for the water seepage of the chambers, necessitating grouting for seepage control. Microbial-induced calcium carbonate precipitation (MICP), which generates microbial cement, offers new ideas for sealing micro-fissures in rock masses due to its small slurry particles, low viscosity, and good fluidity. The process of reducing seepage through microbial mineralization grouting and sealing rock fissures involves a series of reactions such as microbial urease hydrolysis, mineralization reactions generating precipitation, and the attachment and distribution of precipitation in the fissures. This research first elaborates on the basic principles of microbial mineralization reactions, and introduces the biocatalytic effect based on the most widely studied and applied urease-catalyzed urea hydrolysis method. Then, by analyzing the impact of the precipitation generated during urease-catalyzed urea hydrolysis on the fissure width, theoretical formulas for the reduction of fissure permeability due to different attachment characteristics of mineralization reaction precipitates are derived, and the corresponding influencing effects are analyzed. This article aims to provide a theoretical basis for subsequent research on the mechanism of reducing seepage through microbial mineralization sealing of rock fissures by understanding the coupling relationships involved in the process.
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图 4 裂隙中附着的沉淀导致隙宽变化示意图
Figure 4. Schematic diagram of aperture variation caused by attached precipitates in fractures
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