Study on the fracture toughness of fractured rock mass reinforced by MICP/EICP with different calcium sources

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-08-23 DOI:10.1016/j.tafmec.2025.105188

Mingzhi Zhang , Shuguang Zhang , Junjie Zheng , Yu Song , Jiaming Li

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引用次数: 0

Abstract

Fractured rock masses are prone to geological hazards due to their structural discontinuity and complex failure mechanisms, and require urgent reinforcement to enhance stability. In this study, microbially induced carbonate precipitation (MICP) and enzyme induced carbonate precipitation (EICP) were used to reinforce fractured rock masses with different fracture angles under two calcium sources: inorganic calcium source CaCl₂ and organic calcium source C₆H₆O₄Ca·H₂O. Perform three-point bending test and scanning electron microscopy test on the reinforced fractured rock mass. The results indicate that when CaCl₂ is used as the calcium source, the reinforcement effect of MICP is mostly better than that of EICP system. CaCO₃ is mainly generated by calcite crystals, which are larger and arranged in different directions. When using C₆H₆O₄Ca·H₂O as the calcium source, most EICP systems exhibit better reinforcement effects. CaCO₃ is mainly generated by vaterite crystals, with tightly arranged crystals and smaller interparticle pores. In addition, polynomial regression models were developed for K_ⅠC, K_ⅠⅠC, and K_eff under different reinforcement methods, and the influence of reinforcement cycles on the bearing capacity and fracture toughness of fractured rock masses was discussed. The analysis showed that increasing the number of reinforcement cycles from 1 to 7 increased the peak load by 12.03 times. This study applies MICP/EICP technology to reinforce fractured rock masses, effectively improving their stability and bearing capacity, and demonstrating good engineering applicability and potential for promotion.

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不同钙源MICP/EICP加固裂隙岩体断裂韧性研究

裂隙岩体结构不连续，破坏机制复杂，易发生地质灾害，亟需加固以增强稳定性。本研究在无机钙源CaCl2和有机钙源C6H6O4Ca·H2O两种钙源下，采用微生物诱导碳酸盐沉淀（MICP）和酶诱导碳酸盐沉淀（EICP）对不同断裂角度的裂隙岩体进行加固。对加固后的裂隙岩体进行三点弯曲试验和扫描电镜试验。结果表明，以CaCl2为钙源时，MICP的强化效果大多优于EICP体系。CaCO3主要由方解石晶体生成，方解石晶体体积较大，排列方向不同。当以C6H6O4Ca·H2O为钙源时，大多数EICP体系具有较好的强化效果。CaCO3主要由水晶石晶体生成，晶体排列紧密，颗粒间孔隙较小。建立了不同加固方式下KⅠC、KⅠⅠC和Keff的多项式回归模型，讨论了不同加固周期对裂隙岩体承载力和断裂韧性的影响。分析表明，加固循环次数从1次增加到7次，峰值荷载增加12.03倍。本研究将MICP/EICP技术应用于裂隙岩体加固，有效提高了岩体的稳定性和承载能力，具有良好的工程适用性和推广潜力。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.