Abstract
Water sensitivity is the special feature of unsaturated loess, which is the main cause of engineering problems in loessial regions. Previous studies have generally focused on potential changes on mechanical properties of loess when it is moistened to saturation, while the moistening process is often ignored. In order to investigate the mechanical behaviors of unsaturated loess during the moistening process, this paper takes unsaturated loess obtained from Ili, **njiang Autonomous Regions, China, as study object. A self-developed oedometer was used which was available for adding water into the soil sample during loading, measuring the coefficient of earth pressure at rest and matrix suction during moistening. Loess samples obtained from 3 buried depths were tested under 4 different vertical loads. The moistening level was defined to refer to the relative level of water content with regard to the initial and saturated water contents of a soil sample. Change tendencies of moistening deformation, the coefficient of earth pressure at rest as well as suction versus the moistening level were investigated.
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References
Alpan, I. (1967). “The empirical evaluation of the coefficient K0 and K0R.” Soils and Foundations, vol. 7, no. 1, pp. 31–40. DOI: 10.3208/sandf1960.7.31.
Boyd, J. L. and Sivakumar, V. (2011). “Experimental observations of the stress regime in unsaturated compacted clay when laterally confined.” Geotechnique, vol. 61, no. 4, pp. 345–363. DOI: 10.1680/geot.2011.61.4.345.
Brooker, E. W. and Ireland, H. O. (1965). “Earth pressures at rest related to stress history.” Can. Geotech. J, vol. 2, no. 1, pp. 1–15. DOI: 10.1139/t65-001
Brooks, R. H., and Corey, A. T. (1964). “Hydraulic properties of porous media.” Hydrology Papers, Colorado State University, Fort Collins, CO, USA, DOI: 10.13031/2013.40684.
David, M. W. (1990). Soil behaviour and critical state soil mechanics, Cambridge University Press, Cambridge, England.
Fredlund, D. G. and Rahardjo, H. (1993). Soil mechanics for unsaturated soils. John Wiley & Sons, Inc., New York, DOI: 10.1002/9780470172759.
Fredlund, D. G. and **ng, A. (1994). “Equations for the soil-water characteristic curve.” Can. Geotech. J, vol. 31, no. 4, pp. 521–532. DOI: 10.1139/t94-061.
Gardner, W. R. (1958). “Some steady-state solutions of the unsaturated moisture flow equation with application to evaporation from a water table.” Soil Science, vol. 85, no. 4, pp. 228–232. DOI: 10.1097/00010694-195804000-00006.
GB50025 (2004). Code for building construction in collapsible loess regions, China Architecture and Building Press, Bei**g, China (in Chinese).
Guo, P. J. (2010). “Effect of density and compressibility on K0 of cohesionless soils.” Acta Geotechnica, vol. 5, no. 4, pp. 225–238. DOI: 10.1007/s11440-010-0125-0.
Hayashi, H., Yamazoe, N., Mitachi, T., Tanaka, H., and Nishimoto, S. (2012). “Coefficient of earth pressure at rest for normally and overconsolidated peat ground in Hokkaido area.” Soils and Foundations, vol. 52, no. 2, pp. 299–311. DOI: 10.1016/j.sandf.2012.02.007.
Jaky, J. (1944). “The coefficient of earth pressure at rest.” Journal Soc. of Hungarian Architects and Engineers, vol. 7, pp. 355–358.
Jiang, M. J., Li, T., Hu, H. J., and Thornton, C. (2014). “DEM analyses of one-dimensional compression and collapse behaviour of unsaturated structural loess.” Computers and Geotechnics, vol. 60, no. 1, pp. 47–60. DOI: 10.1016/j.compgeo.2014.04.002
**, S. L., **ng, Y. C., Zhao, W. Q., Zhang, A. J., and Guo, M. X. (2017). “Study on nonlinear constitutive model for loess moistening deformation based on single-line experiment method.” Journal of Hydraulic Engineering, vol. 48, pp. 710–719. DOI: 10.13243/j.cnki.slxb.20161231(in Chinese).
Jotisankasa, A., Coop, M., and Ridley, A. (2009). “The mechanical behavior of an unsaturated compacted silty clay.” Geotechnique, vol. 59, no. 5, pp. 415–428. DOI: 10.1680/geot.2007.00060.
Jotisankasa, A., Ridley, A., and Coop, M. (2007). “Collapse behavior of compacted silty clay in suction-monitored oedometer apparatus.” J. Geotech. Geoenviron. Eng, vol. 133, no. 7, pp. 867–877. DOI: 10.1061/(ASCE)1090-0241(2007)133:7(867).
Lin, Z. G. and Liang, W. M. (1982). “Engineering properties and zoning of loess and loess-like soils in China.” Can. Geotech. J, vol. 19, no. 1, pp. 76–91. DOI: 10.1139/t82-007.
Liu, Z. D. (1997). Soil mechanics and engineering for loess, Shaanxi Science and Technology Press, Shaanxi, China (in Chinese).
Liu, B. J., **e, D. Y., and Guo, Z. Y. (2004). “A practical method for moistening deformation of loess foundation.” Rock and Soil Mechanics, vol. 25, no. 2, pp. 270–274. DOI: 10.16285/j.rsm.2004.02.025 (in Chinese).
Mayne, P. W. and Kulhawy, F. H. (1982). “K0-OCR relationships in soil.” Journal of the Geotechnical Engineering Division, vol. 20, no. 1, pp. 851–872. DOI: 10.1016/0148-9062(83)91623-6.
Munozcastelblanco, J., Delage, P., Pereira, J. M., and Cui, Y. J. (2011). “Some aspects of the compression and collapse behaviour of an unsaturated natural loess.” Geotechnique Letters, Vol.1, no. 2, pp. 17–22. DOI: 10.1680/geolett.11.00003.
Northcutt, S., and Wijewickreme, D. (2013). “Effect of particle fabric on the coefficient of lateral earth pressure observed during onedimensional compression of sand.” Can. Geotech. J, Vol.50, no. 5, pp. 457–466. DOI: 10.1139/cgj-2012-0162.
Pereira, H. F. and Fredlund, D. G. (2000). “Volume change behavior of collapsible compacted gneiss soil.” J. Geotech. Geoenviron. Eng, vol. 126, no. 10, pp. 907–916. DOI: 10.1061/(ASCE)1090-0241(2000)126:10(907).
Rogers, C. D. F., Dijkstra, T. A., and Smalley, I. J. (1994). “Hydroconsolidation and subsidence of loess: Studies from China, Russia, North America and Europe.” Engineering Geology, vol. 37, no. 2, pp. 83–113. DOI: 10.1016/0013-7952(94)90045-0.
Sivakumar, V., Navaneethan, T., Gallagher, G. (2009). “An assessment of the earth pressure coefficient in overconsolidated clays.” Geotechnique, vol. 59, no. 10, pp. 825–838. DOI: 10.1680/geot.8.P.033.
Sun, D. A. and Xu, Y. F. (2004). “Collapse behavior of compacted clays in suction-controlled triaxial tests.” Geotechnical Testing Journal, vol. 27, no. 4, pp. 362–370. DOI: 10.1520/GTJ11418.
Van Genuchten, M. T. (1980). “A closed-form equation for predicting the hydraulic conductivity of unsaturated soils.” Soil Science Society of America Journal, vol. 44, no. 44, pp. 892–898. DOI: 10.2136/sssaj1980.03615995004400050002x.
Williams, J., Preeble, R. E., Williams, W. T., and Hignett, C. T. (1983). “Influence of texture, structure and clay mineralogy on the soil moisture characteristics.” Australian Journal of Soil Research, vol. 21, no. 1, pp. 15–32. DOI: 10.1071/SR9830015.
**e, D. Y. and Qi, J. L. (1999). “Soil structure characteristics and new approach in research on its quantitative parameter.” Chinese Journal of Geotechnical Engineering, vol. 21, no. 6, pp. 651–656. DOI: 10.3321/j.issn:1000-4548.1999.06.003 (in Chinese).
**e, D. Y. and **ng, Y. C. (2016). Soil mechanics for loess soils, Higher Education Press, Bei**g, China (in Chinese).
Zhu, Y. P., Zhang, G. W., Wang, X. L., and Song, Y. (2007). “Model test on rectification of inclined buildings by induced settlement method and case studies.” Chinese Journal of Rock Mechanics and Engineering, Vol. 26, Supp. 1, pp. 3288–3296. DOI: 10.3321/j.issn:1000-6915.2007.z1.105 (in Chinese).
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**ng, Y., Gao, D., **, S. et al. Study on Mechanical Behaviors of Unsaturated Loess in terms of Moistening Level. KSCE J Civ Eng 23, 1055–1063 (2019). https://doi.org/10.1007/s12205-019-0848-x
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DOI: https://doi.org/10.1007/s12205-019-0848-x