Biogeotechnical approach for slope soil stabilization using locally isolated bacteria and inexpensive low-grade chemicals: A feasibility study on Hokkaido expressway soil, Japan

Gowthaman, Sivakumar; Mitsuyama, Shumpei; Nakashima, Kazunori; Komatsu, M.; Kawasaki, Satoru

doi:10.1016/j.sandf.2018.12.010

Cited by 77 publications

(46 citation statements)

References 37 publications

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“…The UCS increases during MICP improvement as calcium carbonate precipitates and cements the soil particles, as a result of void space reduction. It is also clear that the UCS increases exponentially with the increase in calcium carbonate content, similar to that reported in previous studies [2,6,32].…”

Section: Uniformity Of Cementationsupporting

confidence: 90%

“…Isolation and characterization of bacteria was performed in accordance with the method suggested in previous studies [9,32]. Soil sample collected from the study location (in sterile test tubes) was employed in laboratory for identifying bacteria.…”

Section: Isolation and Characterization Of Indigenous Bacteriamentioning

confidence: 99%

“…The penetration depth (mm) of the needle attached to the device and the penetration resistance (N) were measured during the test. Using the regression relationship (Eq 114 natural soft rock samples and 50 cemented soil samples, the UCS of the specimen was estimated [32,38].…”

Section: Uniaxial Compressive Strength (Ucs) Measurementmentioning

confidence: 99%

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Feasibility study for slope soil stabilization by microbial induced carbonate precipitation (MICP) using indigenous bacteria isolated from cold subarctic region

et al. 2019

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Microbial induced carbonate precipitation (MICP) is relatively an innovative soil improvement technique, learnt from the bio-mediated geochemical reactions that naturally occur in the earth surface. During the MICP, CaCO 3 is metabolically precipitated in soil pores, cement the particle contacts and improves the strength and stiffness of soil. Environment temperature is one of the most key factors that determines the efficiency MICP. The purpose of this study is to investigate the feasibility of stabilizing the slope soil of cold subarctic region (Hokkaido, Japan). The implication of MICP in cold subarctic zones remains as a major challenge, as the enzymatic performance of the bacteria typically declines during lower temperatures hence insufficient formation of CaCO 3 in soil matrix. Therefore, as a potential approach, this study attempted to investigate the feasibility of using the bacteria which have been adapted to native cold climatic conditions. The objectives of this paper are evaluating (1) the effect of temperature in bacterial response, and (2) the effect of grain size distribution in cementation mechanism. The observations suggest that the enzyme activity of the bacteria is negligible at and above 30 °C, whereas it is significant at relatively lower temperatures. The comparison of treated soils suggests that the fine content in slope soil increased number of particle contacts, facilitated effective packing, and promoted the effectiveness of MICP compared to that of uniformly graded sands. Finally, the technical feasibility in slope soil stabilization was well demonstrated using model solidification test. The limitations in stabilizing the slope are also discussed in detail.

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Section: Uniformity Of Cementationsupporting

confidence: 90%

Section: Isolation and Characterization Of Indigenous Bacteriamentioning

confidence: 99%

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Feasibility study for slope soil stabilization by microbial induced carbonate precipitation (MICP) using indigenous bacteria isolated from cold subarctic region

et al. 2019

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“…The urea hydrolysis and resultant local alkalinity rise along with bacterial cells acting as nucleation sites might have developed a high supersaturation in the medium, giving rise to massive vaterite crystallization here. On the other hand, extracellular polymeric substances (EPS) play an important role in polymorph selection [67] and vaterite crystals have been abundantly reported with a high amount of accumulated EPS [68], which is possible in this case too. Moreover, vaterite generation is also preferred with the introduction of various organic matter to the aqueous system [69].…”

Section: Effect Of Mg 2+ Addition On Microbial Induced Carbonate Precmentioning

confidence: 92%

“…Moreover, vaterite generation is also preferred with the introduction of various organic matter to the aqueous system [69]. vaterite crystals have been abundantly reported with a high amount of accumulated EPS [68], which is possible in this case too. Moreover, vaterite generation is also preferred with the introduction of various organic matter to the aqueous system [69].…”

Section: Effect Of Mg 2+ Addition On Microbial Induced Carbonate Precmentioning

confidence: 99%

Microbial Induced Carbonate Precipitation Using a Native Inland Bacterium for Beach Sand Stabilization in Nearshore Areas

et al. 2019

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Microbial Induced Carbonate Precipitation (MICP) via urea hydrolysis is an emerging sustainable technology that provides solutions for numerous environmental and engineering problems in a vast range of disciplines. Attention has now been given to the implementation of this technique to reinforce loose sand bodies in-situ in nearshore areas and improve their resistance against erosion from wave action without interfering with its hydraulics. A current study has focused on isolating a local ureolytic bacterium and assessed its feasibility for MICP as a preliminary step towards stabilizing loose beach sand in Sri Lanka. The results indicated that a strain belonging to Sporosarcina sp. isolated from inland soil demonstrated a satisfactory level of enzymatic activity at 25 °C and moderately alkaline conditions, making it a suitable candidate for target application. Elementary scale sand solidification test results showed that treated sand achieved an approximate strength of 15 MPa as determined by needle penetration device after a period of 14 days under optimum conditions. Further, Scanning Electron Microscopy (SEM) imagery revealed that variables such as grain size distribution, bacteria population, reactant concentrations and presence of other cations like Mg2+ has serious implications on the size and morphology of precipitated crystals and thus the homogeneity of the strength improvement.

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Used Paper Fibers for Sustainably Enhancing the MICP Stabilization of Sand

Chen

Gowthaman

Nakashima

et al. 2021

Advances in Urban Geotechnical Engineering

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Biogeotechnical approach for slope soil stabilization using locally isolated bacteria and inexpensive low-grade chemicals: A feasibility study on Hokkaido expressway soil, Japan

Cited by 77 publications

References 37 publications

Feasibility study for slope soil stabilization by microbial induced carbonate precipitation (MICP) using indigenous bacteria isolated from cold subarctic region

Feasibility study for slope soil stabilization by microbial induced carbonate precipitation (MICP) using indigenous bacteria isolated from cold subarctic region

Microbial Induced Carbonate Precipitation Using a Native Inland Bacterium for Beach Sand Stabilization in Nearshore Areas

Used Paper Fibers for Sustainably Enhancing the MICP Stabilization of Sand

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