Permeable rock matrix sealed with microbially-induced calcium carbonate precipitation: Evolutions of mechanical behaviors and associated microstructure

Chen, Song; Elsworth, Derek; Jia, Yunzhong; Lin, Junzhi

doi:10.1016/j.enggeo.2022.106697

Cited by 29 publications

(5 citation statements)

References 37 publications

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“…3 The calibration was first carried out with the standard liquid of uranium. 4 The argon gas flow rate was slowly adjusted to 15 L /min, and the auxiliary gas flow rate was 2 L /min.…”

Section: Methodsmentioning

confidence: 99%

“…MICP technology empowers an ecologically friendly approach to enhancement since it can improve the stiffness, bearing capacity, permeability, and liquefaction resistance of earth and rock. Song et al [4] conducted several cycles of MICP via grouting on sandstone. This achieved remarkable results: a 229% increase in uniaxial compressive strength, a 179% increase in elastic modulus, and a 177% increase in brittleness index compared to the pre-grouting conditions.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Solidification of Uranium Tailings and Uranium Removal Based on MICP

Zhang

et al. 2023

Sustainability

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The governance of uranium tailings aims to improve stability and reduce radionuclide uranium release. In order to achieve this goal, the uranium removal solution test and uranium tailings grouting test were successively carried out using microbially induced calcium carbonate precipitation (MICP) technology. The effect of MICP on the reinforcement of uranium tailings and the synchronous control of radionuclide uranium in the tailings were discussed. The solution test results show that Sporosarcina pasteurii could grow and reproduce rapidly in an acidic medium with an initial pH of 5. The uranium concentration decreased with the increase in MICP reaction time, and the removal efficiency reached 60.9% at 24 h. In the solidification test of tailings, the strength of tailings improved significantly after 12 days of reinforcement, with an increase in the cohesion of tailings by 2.937 times and an increased internal friction angle of 8.393°. The peak stress value of solidified tailings at the surrounding pressure of 50 kPa increased by 1.87 times, and the uranium concentration in the discharge fluid decreased by 76.91% compared to the blank group. This study provides valuable insights and references for safely disposing of uranium tailings.

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“…3 The calibration was first carried out with the standard liquid of uranium. 4 The argon gas flow rate was slowly adjusted to 15 L /min, and the auxiliary gas flow rate was 2 L /min.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Solidification of Uranium Tailings and Uranium Removal Based on MICP

Zhang

et al. 2023

Sustainability

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“…Deng et al (2019) used Sporosarcina pasteurii to repair fractured yellow sandstone samples, and the microbial process could cement the fillings and samples and greatly reduce the porosity. After MICP reinforcement of two different types of sandstone, Song et al (2022) found that although the quality of CaCO 3 precipitated over time in the two rock types was similar, the unconfined compressive strength of low-strength sandstone increased significantly and its mechanical properties are divided into three distinct stages, while there is no significant improvement in the mechanical properties of high-strength sandstone. Zou et al (2021) conducted four groups of seepage experiments on transparent rock samples filled with MICP, and studied the effects of bacterial concentration, crack inclination angle, crack roughness, and crack opening on fracture permeability.…”

Section: Introductionmentioning

confidence: 98%

Shear performance and reinforcement mechanism of MICP-treated single fractured sandstone

Xiao

Deng

et al. 2022

Front. Earth Sci.

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There are a large number of fractured rock masses in the Three Gorges Reservoir area. Traditional reinforcement methods have disadvantages such as large engineering investment, high material consumption, and poor ecological environmental protection. Therefore, it is necessary to develop new environmentally friendly materials and methods to strengthen and control them. The microbial-induced carbonate precipitation (MICP) technology that has emerged in recent years has the characteristics of low carbon and environmental protection and has great prospects in the restoration and reinforcement of rock and soil materials. Therefore, Bacillus cereus extracted in situ from the Three Gorges Reservoir area is proposed to be used for MICP reinforcement of single-fractured sandstone, and its reinforcement mechanism is revealed by studying the macroscopic impermeability and shear performance improvement of the fractured rock sample after reinforcement, and the microstructure changes. The results show that after 10 cycles of grouting reinforcement, the fracture surface of the rock sample is well sealed, the permeability coefficient is reduced by two orders of magnitude, the shear stress is increased by 26%–40%, and the shear stiffness is increased by 70%. The shear stress–shear displacement curve shows the peak shear strength, and the residual shear strength also increases to a certain extent. The MICP process improves the mechanical properties of fractured rock samples from three aspects, namely, the cementation between sand grains and the fracture surface, the cementation effect between sand grains, and the filling effect of fractured rock samples. The shear failure surface of the samples after reinforcement is the recheck interface between the cementation body and the cementation interface. The relevant research results can provide references for the MICP reinforcement technology of fractured rock mass.

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“…This study assesses the degree to which flow-induced bulk transport of biomass and precipitates can affect permeability reduction in natural porous media subjected to bioaugmented MICP. In contrast to previous experimental investigations of MICP in porous media, which have primarily used unconsolidated columns ,,,, and homogeneous sandstones, ,− this study uses permeable limestone cores of differing pore size and spatial arrangement. A staged, continuous-flow injection strategy was designed with separate biomass attachment, biofilm cultivation, and mineralization phases, and the impact of each phase on the permeability and effective pore volume was evaluated.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Limitations on Biomineralization-Induced Permeability Reduction

Albalghiti,

Ellis

2024

ACS Earth Space Chem.

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While the subsurface applications of microbially induced carbonate precipitation (MICP) have so far emphasized near-wellbore permeability reduction, MICP technology may eventually be expanded to support needs as diverse as thief zone remediation in geothermal reservoirs or caprock sealing in CO 2 sequestration sites. For these applications to be realized, however, there is a need to understand whether permeability reduction can be achieved under the high flow velocities that may occur, for example, in zones of locally high permeability or along preferential flow paths. In this study, bioaugmented MICP is applied to three natural limestone cores of similar porosity but differing pore size distribution. The injection strategy includes biomass attachment and growth phases before mineralization, with the goal of separating the effects of each phase on permeability. In order to test the resilience of biomass and precipitate accumulation against flow-induced shear stress, saline solution is injected intermittently at a faster flow rate. Real-time permeability estimates show that biomass accumulation reduces permeability even without mineralization, although biomass accumulation may ultimately be shear-limited. Calcium mass balances suggest that sloughing of precipitates is also possible, though its effect on permeability depends on whether mobilized precipitates induce clogging or are transported out of the core. X-ray computed microtomography imaging of the cores suggests that when flow rates are moderate and preferential flow paths do not dominate flow, precipitates tend to accumulate preferentially in larger pores, yielding controlled, incremental permeability reduction. These findings lay essential groundwork toward refining MICP models to account for spatial heterogeneities in the subsurface.

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Permeable rock matrix sealed with microbially-induced calcium carbonate precipitation: Evolutions of mechanical behaviors and associated microstructure

Cited by 29 publications

References 37 publications

Experimental Study on the Solidification of Uranium Tailings and Uranium Removal Based on MICP

Experimental Study on the Solidification of Uranium Tailings and Uranium Removal Based on MICP

Shear performance and reinforcement mechanism of MICP-treated single fractured sandstone

Hydrodynamic Limitations on Biomineralization-Induced Permeability Reduction

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