首页|Experimental study on the mechanical properties and consolidation mechanism of microbial grouted backfill

Experimental study on the mechanical properties and consolidation mechanism of microbial grouted backfill

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Backfill mining technology is the practice of returning waste materials underground for both disposal and geotechnical stability,however,a challenge with current technologies is that they commonly require cement-based binders which have a relatively high environmental impact.Finding alternatives to cement-based binders can improve environmental performance and this paper proposes microbial grouted backfill(MGB)as a potential solution.In this paper,the effects of the cementation solution con-centration(CSC),volume ratio of bacterial solution to cementation solution(VRBC),particle sizes of the aggregates,and the number of grouting batches on the mechanical properties of MGB are studied.The experimental results show that MGB strength increased,up to a peak value,as CSC was increased,before decreasing as CSC was increased further.The results also show that MGB strength increased,up to a peak value,as VRBC decreased,before decreasing as the VRBC was decreased further.The peak strength was achieved at a CSC of 2 mol/L and a VRBC of 1:9.The strength of the MGB also increased as the number of grouting batches increased.Graded MGB samples showed the highest UCS,25.12 MPa,at particle sizes of 0.2 to 0.8 mm,while full(non-graded)MGB samples displayed mean UCS values ranging from 1.56 MPa when the maximum particle size was 0.2 mm,up to 13 MPa when the maximum particle size was 1.2 mm.MGB samples are consolidated by the calcium carbonate that is precipitated during micro-bial metabolism,and the strength of MGB increases linearly as calcium carbonate content increases.The calcium carbonate minerals produced in MGB materials are primarily calcite,with secondary amounts of vaterite.

Microbial grouted backfillMechanical propertiesConsolidation mechanismMicrobial induced carbonate precipitationGroutingBackfill mining

Xuejie Deng、Yu Li、Fei Wang、Xiaoming Shi、Yinchao Yang、Xichen Xu、Yanli Huang、Benjamin de Wit

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School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China

Kailuan(Group)Limited Liability Corporation,Tangshan 063018,China

Department of Civil Engineering Tsinghua University,Beijing 100084,China

School of Mining and Geology Engineering,Xinjiang Institute of Engineering,Urumqi 830023,China

Norman B.Keevil Institute of Mining Engineering,University of British Columbia,Vancouver V6T 1Z4,Canada

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National Natural Science Foun-dation of ChinaNational Natural Science Foun-dation of ChinaChina Postdoctoral Science FoundationChina Postdoctoral Science FoundationYue Qi Young Scholar ProjectPostdoctoral Research Project of Hebei Province

51804308520340092020T1302692020M6706892020QN03B2020003029

2022

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDSCIEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2022.32(2)
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