Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/150781
Title: 3D characterization of microbially induced carbonate precipitation in rock fracture and the resulted permeability reduction
Authors: Wu, Chuangzhou
Chu, Jian
Wu, Shifan
Hong, Yi
Keywords: Engineering::Civil engineering
Issue Date: 2019
Source: Wu, C., Chu, J., Wu, S. & Hong, Y. (2019). 3D characterization of microbially induced carbonate precipitation in rock fracture and the resulted permeability reduction. Engineering Geology, 249, 23-30. https://dx.doi.org/10.1016/j.enggeo.2018.12.017
Project: SUL2013-1
MOE2015-T2-2-142
Journal: Engineering Geology
Abstract: A new seepage control method for fractured rock is biogrouting through a microbially induced calcite precipitation (MICP) process. A study on the spatial distribution of biogrout in a rock fracture and its effect on permeability reduction is presented in this paper. A series of experiments together with 3D scanning and 3D flow simulation were performed on rock fractures with various initial apertures treated by bio-grouting. A lognormal distribution of MICP precipitates along the flow direction in a fracture was observed. The 3D flow simulation of biogrouted fracture has revealed that the routinely adopted parallel plate model (cubic law) for estimating permeability of channel flow is no longer applicable when the fracture aperture is less than the critical value of 0.7 mm based on this study. This is because partially clogging will occur when the fracture aperture is less than the critical value, resulting in a transition of the flow type from surface flow to channel flow. A semi-empirical equation which can account for the effect of flow type has been proposed for estimating the permeability reduction due to bio-grouting for rock fractures.
URI: https://hdl.handle.net/10356/150781
ISSN: 0013-7952
DOI: 10.1016/j.enggeo.2018.12.017
Rights: © 2018 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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