Abstract
In the present circumstances when available sites for construction are very limited owing to rapid industrialization and population explosion, biologically induced ground improvement methods are gaining worldwide attention as they are eco-friendly and cause no damage to the surroundings. This paper presents an innovative approach featuring laboratory-scale testing, on the effectiveness of bacteria in stabilizing weak river sediments. Effectiveness of this bio-stabilization technique was established by a series of laboratory tests like unconfined compressive strength (UCS) and California bearing ratio tests (CBR). Two different bacteria, Bacillus subtilis (B.S) and Bacillus megaterium (B.M), were used in this study at an optical density of 2.0, and a bio-augmentation approach was adopted. Treatment was given under controlled conditions, and an enhancement in the UCS values for both bacteria was noted in contrast to the control specimen. Two different treatment approaches were adopted for UCS samples, viz. treatment in fabricated brass moulds and full contact flexible moulds (FCFM) made of non-woven geo-textiles. The increase in UCS for 0.5 molar cementation solution concentration from 197 to 544 and 637 kPa for B.S and B.M treatment, respectively, in fabricated brass moulds and 197–603 and 674 kPa for B.S and B.M, respectively, in FCFMs was appreciable along with a CBR enhancement from 6 to 15% and 2–10% for B.M treatment in unsoaked and soaked conditions, respectively. Curing effect on UCS samples (0, 3 and 7 days) was also studied. The experimental results were in turn supported by scanning electron microscopy and Fourier transform infrared spectroscopy.
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Data availability
All associated data can be made available on request from the corresponding author.
Abbreviations
- UCS:
-
Unconfined compressive strength
- CBR:
-
California bearing ratio
- B.S :
-
Bacillus subtilis
- B.M :
-
Bacillus megaterium
- O.D:
-
Optical density
- FCFM:
-
Full contact flexible mould
- CSM:
-
Cementing solution molarity
- SEM:
-
Scanning electron microscopy
- FTIR:
-
Fourier transform infrared spectroscopy
- MICP:
-
Microbially induced calcite precipitation
- CS:
-
Cementing solution
- PSD:
-
Particle size distribution
- LB:
-
Lysogeny broth
- DST:
-
Direct shear test
- GSM:
-
Gram square metre
- AOS:
-
Apparent opening size
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Acknowledgements
The authors would like to thank the Geotechnical staff and the Department of Civil Engineering, NIT Srinagar, for arranging the consumables required for the experiments and providing laboratory facilities round the clock.
Funding
PhD fellowship from Govt. of India (Ministry of Education) is received by the first and the third author under JRF/SRF grants.
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Wani, K.M.N.S., Mir, B.A. & Sheikh, I.R. Biological processes in the stabilization of weak river sediments: an innovative approach. Innov. Infrastruct. Solut. 6, 164 (2021). https://doi.org/10.1007/s41062-021-00538-5
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DOI: https://doi.org/10.1007/s41062-021-00538-5