Sustainable construction and quality of improved columns with three types of water-cement ratios on deep mixing method in Saga Lowland, Kyushu, Japan
Tóm tắt
In this study, we investigated the application of the deep mixing method (DMM) to cohesive soil in the Saga Lowland of Kyushu, Japan. The study focused on examining three types of water-cement ratio (W/C) conditions, with a constant addition of cement-based binder (C). Due to the soft clay nature of the Saga Lowland, frequent ground settlement and deformation occur, necessitating measures to prevent adverse effects on the surrounding environment. The objective of this research is to provide a valuable approach to optimizing the quality of the improved columns while minimizing ground displacement in an environmentally considerate manner. In Saga Lowland, it is common to fix the W/C ratio at 1.0 and vary the cement content. Through experimental construction for improved columns on the field, the study confirmed that W/C values of 0.5, 1.0, and 1.5 influence the quality of the improved structure. A higher W/C value of 1.5 resulted in a more fluid cement slurry due to a higher injection rate (IR = 23.9%), as evidenced by statistical analysis revealing higher average unconfined compressive strength (
$$\overline{{q }_{u}}$$
), and a lower coefficient of variation (CV). The defective rate of 10% (qudr) from the design standard strength shows that values are lowest for Case 2, followed by Case 3 and then Case 1. Comparing the values of Case 2 and Case 3, it is observed that in Case 3, with a higher W/C, the CV is lower.. Regarding horizontal ground displacement (Sh), Case 3 exhibited a Sh value of 2.0 to 6.5 mm, significantly lower than Saga prefecture standards (20 mm). This outcome is attributed to reduced viscosity during mixing, leading to improved fluidity and minimal lateral displacement of the soil–cement columns (which often results in lateral ground uplift). Even though with a higher W/C = 1.5, the implementation cost remains the same, but the constructed structure would be of higher quality and smaller displacement, with the overall structure corresponding to the standard quality. The study includes the specific geotechnical conditions of the Saga Lowland and the scope of experimentation. Nonetheless, in terms of the applicability and optimization of DMM in Saga Lowland, the findings provide practical guidance for engineers in selecting W/C ratio and IR during construction for future DMM implementations, thereby contributing to the development of long-lasting infrastructure and sustainable societal development.
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Tài liệu tham khảo
Chai J, Shrestha S, Hino T (2019) Failure of an embankment on soil-cement column-improved clay deposit: Investigation and analysis, case study. J Geotechnical Geoenvironmement Enginering, ASCE 145(9):05019006
Hanzawa H, Fukaya T, Suzuki K (1990) Evaluation of engineering properties for an Ariake clay. Jpn Soc Soil Mech Found Eng 30(4):11–24
T. Hino, J.-C. Chai, T. Negami, D. T. Bergado and R. Jia, "Assessment of the effects of sea-level change on the geoenvironment: The case of the Ariake Sea coastal lowlands," in Proceedings of the International Symposium on LOWLAND TECHNOLOGY 2014, Vols. ISBN: 4 -921090-06-8, Saga, International Association of Lowland Technology (IALT), Institute of Lowland and Marine Research (ILMR), Saga University, 2014, pp. 21-30.
Hong Z, Onitsuka K (1998) A Method of Correcting Yield Stress and Compression Index of Ariake Clays for Sample Disturbance. Soils and Foundations, Japanese Geotechnical Soc 38(2):211–222
Carașca O (2016) Soil improvement by mixing: techniques and performances. Science Direct, Elsevier. 85(85):85–92. https://doi.org/10.1016/j.egypro.2015.12.277
Kitazume, Masaki; Terashi, Masaaki; Tokunaga, Sachihito; Yasuoka, Nobushige, "Design of Deep Mixing Support for Embankments and Levees," in Deep Mixing 2009, Okinawa Symposium, SANWA CO.,LTD, 2009, p. 37.
Hino T, Jia R, Sueyoshi S Harianto T 2012."Effect of environment change on the strength of cement/lime treated clays," https://doi.org/10.1007/s11709-012-0153-y.
Shrestha S, Chai J, Bergado DT, Hino T, Kamo Y (2015) 3D FEM investigation on bending failure mechanism of column inclusion under embankment load. Lowland Technol Int 17(3):157–166
Shen SL, Huang XC, DU SJ, Han J (2003) Laboratory Studies on Property Changes in Surrounding Clays Due to Installation of Deep Mixing Columns. Marine Georesources Geotechnol 21:15–35
Shen SL, Han J, Asce M, Du YJ (2008) Deep Mixing Induced Property Changes in Surrounding Sensitive Marine Clays. J Geotechnical Geoenvironmental Eng 134(6):845–54
Shen SL, Miura N, Hirofumi K (2003) Interaction mechanism between deep mixing column and surrounding clay during installation. Can Geotechnical J 40(2):293–307
Mikasa M (1964) “Classification table of engineering properties of soil and its significance,” Tsuchi-to-Kiso. JGS (in Japanese) 12(4):17–24
J. C. Association, "jcasso.or.jp,". Available: https://www.jcassoc.or.jp/cement/1jpn/jf.html#: Accessed 25 Feb. 2024.
Mohammed S, Safiullah O (2018) Optimization of the SO3 content of an Algerian Portland cement: Study on the effect of various amounts of gypsum on cement properties. Construction Building Materials, Elsevier 164:362–370. https://doi.org/10.1016/j.conbuildmat.2017.12.218
Herliati, A. Sagitha, D. P. A., P. D. R. and A. Salasa, "Optimization of Gypsum Composition Against Setting Time And Compressive Strength In Clinker For PCC (Portland Composite Cement)," International Conference on Chemical and Material Engineering (ICCME 2020), IOP Publishing. 1053 8, 2021. https://doi.org/10.1088/1757-899X/1053/1/01211
S. Larsson, "Mixing Processes for Ground Improvement by Deep Mixing," Swedish Deep Stabilization Research Centre c/o Swedish Geotechnical Institute, 2002.
J. COASTAL DEVELOPMENT INSTITUTE OF TECHNOLOGY (CDIT), The Deep Mixing Method, Principle, Design and Construction, TOKYO: A. A. BALKEMA PUBLISHERS/LISSE/ABINGDON/EXTON (PA), 2002.
P. W. R. Center, Design and Construction manual for deep mixing method for onshore construction, (in Japanese), Tokyo: Nissaay EbroCo., Ltd., 2004.
Kitazume M, Terashi M (2013) The Deep Mixing Method. CRC Press/Balkema, London, UK
JGS, "Practice for making and curing stabilized soil specimens without compaction," in Laboratory testing standards of geomaterials Vol.2, Japanese Geotechnical Society, 2009.
Boschi K, di Prisco CG, Grassi D, Modoni G, Salvatore E (2024) Nanosilica grout permeation in sand experimental investigation and modeling. J Geotech Geoenviron Eng ASCE. 150(1):18
S. Prefecture, "Department of Prefectural Land Development of Saga Prefectural Government and NPO Technology Forum: Groundworks by deep mixing method in box culverts," in Guidance for the design of landing method , revised edition 2020 . (in Japanese), Saga, Department of Prefectural Land Development of Saga Prefectural Government, 2021, p. 49.
Wang L, Shao G (2023) “Test research on flexural strength of soil-cement reinforced with carbon fibers,” Case Studies in Construction Materials. Elsevier 19:18
Pélabon C, Hilde CH, Einum S, Gamelon M (2020) On the use of the coefficient of variation to quantify and compare trait variation. Society for the Study of Evolution (SSE) and European Society for Evolutionary Biology (ESEB) 4(3):180–188
Canchola AJ, Tang S, Hemyari P, Paxinos E, Marins E (2017) Correct Use of Percent Coefficient of Variation (%CV) Formula for Log-Transformed Data. MOJ Proteomics Bioinformatics 6(4):3
Ju W, Liu J, Yang W-C, Fan Q, Min H, Linchuan F (2024) Enhancing soil ecological security through phytomanagement of tailings in erosion-prone areas. J Hazardous Materials, Elsevier 462(132730):11