Abstract
Step vacuum preloading (SVP) can effectively solve the problem of sludge plugging on prefabricated vertical drains in the process of the traditional vacuum preloading method for the consolidation of high-clay content dredger fill. The microstructure of dredger fill in the consolidation process of step vacuum preloading is constantly changing. To reveal the consolidation mechanism of SVP, the microstructural changes of dredger fill under the step vacuum pressure were studied at the microscopic level. However, most studies on the microstructure of soil concentrate on two-dimensional analysis which cannot accurately reflect the real situation of the microstructure. Three-dimensional studies do not only reflect the surface variations of the soil, but also greatly improve the utilization of other spatial information. SEM images of dredger fill at each vacuum preloading stage were obtained under a SVP indoor simulation test. The SEM images were modeled and displayed using ArcGis software. The 3D porosity of the dredger fill at each vacuum preloading stage was calculated using the area and volume method provided by geographic information system (GIS). The results show that 3D images of dredger fill based on GIS can significantly improve the fluctuations in microstructure than those achieved using 2D images. 3D porosity analysis is more realistic and reliable than the 2D method by which calculates porosity directly from the grayscale image of the dredger fill and avoids calculation error by threshold selection from inaccurate 2D analysis.
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References
American Society for Testing and Materials, ASTM D-2487: Standard classification of soils for engineering purposes. ASTM annual book of standards, volume 04.08 on soil and rock, section 4 - construction. West Conshohocken, PA (2011)
Dong, Z.L., Zhang, G.X., Zhou, Q., Luo, Y., Qiu, Q.C., Li, Y.: Research and application of improvement technology of shallow ultra soft soil formed by hydraulic reclamation in Tianjin Binhai new area. Chin. J. Rock Mech. Eng. 30(5), 1073–1080 (2011)
Guan, Y.F., Tang, T.Z., Chen, H.J., Li, X.M.: Field tests on shallow treatment of super-soft ground by vacuum preloading method. Chin. J. Geotech. Eng. 33(S1), 97–101 (2011)
Kjellman, W.: Consolidation of clay by means of atmosphere pressure. In: Proceedings on Soil Stabilization Conference, Boston, USA, pp. 258–263 (1952)
Lou, Y.: Vacuum Preloading Method of Soft Soil Strengthen Technique. China Communications Press, Beijing (2002)
Wu, C.-Y.: Stability Control and Settlement Forecast of Soft Roadbed Treated with Combined Vacuum-Surcharge Preloading. Jinlin University, Changchun (2007)
Wang, B.-J., Shi, B., Cai, Y., et al.: 3D visualization and porosity computation of clay soil SEM image by GIS. Rock Soil Mech. 29(1), 251–255 (2008)
Wang, Q., Fan, J., Zhang, W., Yuan, X., Chen, H., Niu, C.C.: Consolidation Method of Cascade Vacuum Drainage in Super Soft Ground, China, ZL 2012 1 0301339.6, 25 March 2015
Yuan, X.-Q., Wang, Q., Lu, W.-X., Zhang, W., Chen, H.-E., Zhang, Y.: Indoor simulation test of step vacuum preloading for high-clay content dredger fill. Mar. Georesour. Geotechnol. 36(1), 83–90 (2018)
Yan, H.: Aging Characteristics of Material Structure Changes and Settlement Prediction of Dredger Fill in the Consolidation Process of Step Vacuum Preloading. Jinlin University, Changchun (2015)
Yuan, X.-Q., Wang, Q., et al.: Pore distribution characteristics of dredger fill during hierarchical vacuum preloading. J. Jilin Univ.: Earth Sci. Ed. 42(1), 169–176 (2012)
Zhang, X.-W., Wang, C.-M., Ma, D.-H.: 3D visualization and fractal dimension of soft clay’s microstructure surface undulation. J. Basic Sci. Eng. 20(1), 103–112 (2012)
Zhang, Z.-Q., Wang, Q., Qin, Y., et al.: Indoor simulation test of quick consolidation for dredger fil. J. Jilin Uni.: Earth Sci. Ed. 40(3), 645–650 (2010)
Acknowledgements
This work was supported by the Natural Science Foundation of China (grant numbers: 41602285, 41430642 and 41172236). These supports are greatly appreciated.
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Yuan, Xq., Wang, Ml., Yan, H., Chen, Jq., Tan, Bm. (2018). 3D Visualization Study on Microstructure Variation of Dredger Fill by Step Vacuum Preloading. In: Zhou, A., Tao, J., Gu, X., Hu, L. (eds) Proceedings of GeoShanghai 2018 International Conference: Fundamentals of Soil Behaviours. GSIC 2018. Springer, Singapore. https://doi.org/10.1007/978-981-13-0125-4_25
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DOI: https://doi.org/10.1007/978-981-13-0125-4_25
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