Unconfined compressive strength properties of lignin modified silt
1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013， China；
2. College of Architectural Engineering， Jinling Institute of Technology, Nanjing, Jiangsu
211169， China
Abstract：The unconfined compressive strength properties of lignin modified soil were investigated by unconfined compressive strength tests and scanning electron microscope tests, and the effects of lignin content, curing age, porosity and skeleton void ratio were analyzed. The results show that with the increasing of lignin content, the unconfined compressive strength of modified soil is increased with latter decreasing. The unconfined compressive strength of the modified soil is increased with the increasing of curing age. The established hyperbolic model can predict the relationship among unconfined compressive strength, curing age and lignin content. The addition of lignin changes the porosity and skeleton porosity ratio of the silt. The unconfined compressive strength of the modified soil is decreased with the increasing of skeleton porosity ratio. When the lignin content is 8%, the porosity and skeleton porosity ratio reach the minimum values, while the unconfined compressive strength reaches the maximum value.
OUYANG Y, DONG W Z. Experimental study on compaction characteristics of ligninmodified soil[J]. Journal of Jilin Jianzhu University, 2019, 36(1):43-46，66.（in Chinese）
［4］
TINGLE J S, SANTONI R L. Stabilization of clay soils with nontraditional additives[J]. Transportation Research Record: Journal of the Transportation Research Board, 2003, 1819（1）: 72-84.
［5］
CEYLAN H, COPALAKRISHNAN K, KIM S. Soil stabilization with bioenergy coproduct[J]. Transportation Research Record: Journal of the Transportation Research Board, 2010, 2186（1）:130-137.
［6］
LIU W, WANG J, LIN G C, et al. Microscopic mechanism affecting shear strength in lignintreated loess samples[J]. Advances in Materials Science and Engineering, 2019(3):1-12.
WANG J X, WANG B T. Experimental study of vacuum preloading of lime stabilized sludge[J]. Rock and Soil Mechanics, 2008, 29(Sup1): 575-579.（in Chinese）
HE Z Q, FAN H H, WANG J Q, et al. Experimental study of engineering properties of loess reinforced by lignosulfonate[J]. Rock and Soil Mechanics, 2017, 38(3): 731-739.（in Chinese）
ZHANG T, LIU S Y, CAI G J. Shear behaviors of lignin stabilized silt based on the principle of energy conservation[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(7): 1501-1512.（in Chinese）
[11]
CHANG W J, CHANG C W, ZENG J K. Liquefaction characteristics of gapgraded gravelly soils in K0 condition[J]. Soil Dynamics and Earthquake Engineering, 2014, 56:74-85.
[12]
THEVANAYAGAM S. Liquefaction potential and undrained fragility of silty soils[C]∥Proceedings of the 12th World Conference Earthquake Engineering: Geotechnical Engineering. Auckland, New Zealand: New Zealand Society of Earthquake Engineering, 2000：2383.
[13]
RAHMAN M M, LO S R, GNANENDRAN C T. On equivalent granular void ratio and steady state behavior of loose sand with fines[J]. Canadian Geotechnical Journal, 2008, 45(10):1439-1456.
