@article{montoya_do_gabr_2021, title={Distribution and Properties of Microbially Induced Carbonate Precipitation in Underwater Sand Bed}, volume={147}, ISSN={["1943-5606"]}, DOI={10.1061/(ASCE)GT.1943-5606.0002607}, abstractNote={AbstractMicrobially induced carbonate precipitation (MICP) is an innovative approach to strengthening and improving loose porous media. To advance MICP implementation in various geotechnical applic...}, number={10}, journal={JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING}, author={Montoya, Brina M. and Do, Jinung and Gabr, Mohammed A.}, year={2021}, month={Oct} }
 @article{do_montoya_gabr_2021, title={Scour Mitigation and Erodibility Improvement Using Microbially Induced Carbonate Precipitation}, volume={44}, ISSN={["1945-7545"]}, DOI={10.1520/GTJ20190478}, abstractNote={Enhancing the scour resistance of foundation systems supporting superstructures over waterways is required for the sustainable functionality of the structure. In this article, the use of microbially induced carbonate precipitation (MICP) was investigated for the potential of its use in scour mitigation and erodibility improvement of sand. Testing was performed in a 0.91 by 1.22 by 1.22-m model box, and a double wall delivery system was developed and used to target cementation near the surface. A comparative study was performed on the scour behavior of untreated and treated samples using data from a series of flow tests. Impinging jet testing was used to evaluate the erodibility parameters of treated sand. The results from flow testing indicated that untreated and lightly cemented zones showed similar scour depth, whereas indiscernible scour was observed for the heavily cemented zone. The improvement distribution pattern throughout the media showed an ellipsoidal shape with respect to the injection source. The scour behavior and the cementation pattern indicated less cementation was achieved at the zone near the injection source because of high induced seepage velocity. Based on the impinging jet testing results, an empirical erosion model for MICP-treated sand is proposed as a function of the level of cementation.}, number={5}, journal={GEOTECHNICAL TESTING JOURNAL}, author={Do, Jinung and Montoya, Brina M. and Gabr, Mohammed A.}, year={2021}, month={Sep}, pages={1467–1483} }
 @article{do_montoya_gabr_2019, title={Debonding of microbially induced carbonate precipitation-stabilized sand by shearing and erosion}, volume={17}, ISSN={["2005-307X"]}, DOI={10.12989/gae.2019.17.5.429}, abstractNote={Microbially induced carbonate precipitation (MICP) is an innovative soil improvement approach utilizing metabolic activity of microbes to hydrolyze urea. In this paper, the shear response and the erodibility of MICP-treated sand under axial compression and submerged impinging jet were evaluated at a low confining stress range. Loose, poorly graded silica sand was used in testing. Specimens were cemented at low confining stresses until target shear wave velocities were achieved. Results indicated that the erodibility parameters of cemented specimens showed an increase in the critical shear stress by up to three orders of magnitude, while the erodibility coefficient decreased by up to four orders of magnitude. Such a trend was observed to be dependent on the level of cementation. The treated sand showed dilative behavior while the untreated sands showed contractive behavior. The shear modulus as a function of strain level, based on monitored shear wave velocity, indicated mineral debonding may commence at 0.05% axial strain. The peak strength was enhanced in terms of emerging cohesion parameter based on utilizing the Mohr-Coulomb failure criteria.}, number={5}, journal={GEOMECHANICS AND ENGINEERING}, author={Do, Jinung and Montoya, Brina M. and Gabr, Mohammed A.}, year={2019}, month={Apr}, pages={429–438} }
 @misc{montoya_do_gabr_2018, title={Erodibility of Microbial Induced Carbonate Precipitation-Stabilized Sand under Submerged Impinging Jet}, url={http://dx.doi.org/10.1061/9780784481592.003}, DOI={10.1061/9780784481592.003}, abstractNote={Scour adjacent to foundation systems is a contributing factor to significant structural damage. Microbial induced carbonate precipitation (MICP) is investigated as an approach to improve the soil’s shear strength and stiffness and reduce the potential to scour. In this study, a submerged impinging jet system (mini JET apparatus) is used to assess the erodibility of MICP-treated sand with results presented in the context of data in literature. The results indicated that the critical shear stresses of the MICP-treated specimens increased one to three orders of magnitude, while the erodibility coefficients decreased by up to four orders of magnitude as the cementation level increases. The micro image analysis confirmed that cementation is achieved via precipitated calcium carbonate at the particle contacts. These results suggest that moderate to high levels of cementation using the MICP process is potentially an effective approach to reduce the sand’s erodibility.}, number={296}, journal={IFCEE 2018}, publisher={American Society of Civil Engineers}, author={Montoya, Brina M. and Do, Jinung and Gabr, Mohammed M.}, year={2018}, month={Jun}, pages={19–28} }
 @article{do_heo_yoon_chang_2018, title={Geotechnical design parameter evaluation using the alluvial plain characteristics in southeastern Iraq}, volume={11}, ISSN={["1866-7538"]}, DOI={10.1007/s12517-018-4019-z}, number={20}, journal={ARABIAN JOURNAL OF GEOSCIENCES}, author={Do, Jinung and Heo, Ong and Yoon, Yeo-Won and Chang, Ilhan}, year={2018}, month={Oct} }
 @article{do_heo_yoon_chang_2017, title={Evaluating the liquefaction potential of gravel soils with static experiments and steady state approaches}, volume={21}, ISSN={["1976-3808"]}, DOI={10.1007/s12205-016-1365-9}, number={3}, journal={KSCE JOURNAL OF CIVIL ENGINEERING}, author={Do, Jinung and Heo, Seoung-Beom and Yoon, Yeo-Won and Chang, Ilhan}, year={2017}, month={Mar}, pages={642–651} }
 @inproceedings{lee_do_kim_park_2017, title={Evaluation of durability and waterproofing characteristic of cast-in-place piles using surfactant grout at the field tests}, DOI={10.1061/9780784480793.012}, abstractNote={In case of underground construction affected by groundwater, CIP (cast-in-place pile) method is generally used to solve the geohydraulic problem. However, as this method has poor connectivity between piles, an auxiliary cut-off method is required in many cases. In this study, a newly-developed cut-off wall (H-CIP) without auxiliary method, by using surfactant grout (Hi-FA), which improves anti-washout performance and infiltration ability, is introduced and the field applicability of H-CIP method is evaluated. CIP and H-CIP piles were installed under the same ground conditions and field and laboratory tests were conducted to verify the performance, respectively. As a result, a newly-contrived H-CIP method shows higher field performance in terms of cut-off and strength than conventional CIP method.}, number={288}, booktitle={Grouting 2017: grouting, drilling, and verification}, author={Lee, J. and Do, J. and Kim, H. and Park, B.}, year={2017}, pages={124–132} }
 @inproceedings{lee_do_2017, title={Experimental investigation of the horizontal resistance of group suction piles with different pile spacing}, DOI={10.1061/9780784480465.016}, abstractNote={In this study, a new type of suction pile foundation for floating structures, namely group suction piles, was proposed to improve the shortcomings of conventional single suction piles. Small-scale model tests were performed to estimate the horizontal behavior of single suction piles and group suction piles with different pile spacing (2, 3 and 4 times the pile diameter) under various loading conditions in terms of loading locations and inclinations. The horizontal behavior of group suction piles with different pile spacing was analyzed for various loading locations and load inclinations based on the model tests. For the given group pile configurations (a group pile having 9 component piles with a pile formation of 3 × 3), the horizontal resistance increased with increasing pile spacing. The maximum ultimate horizontal resistances were found at the loading locations of 50% of the embedded depth. Unlikely in the single suction pile case, the significantly maintained residual resistances were found for group suction piles. The residual resistances of group suction piles were at least higher than 40% of the corresponding ultimate horizontal resistances.}, number={279}, booktitle={Geotechnical frontiers 2017: foundations}, author={Lee, J. and Do, J. N.}, year={2017}, pages={154–163} }