Equation for Soil Shrinkage Curve of Clay Considering Soil-Water Adsorption Effect

doi:10.16183/j.cnki.jsjtu.2019.106

Abstract

Abstract:

Soil shrinkage occurs with the decrease of water content in soils under dry conditions, which has a great influence on soil cracking, bearing capacity, and slope stability. Hence, it is important to predict soil shrinkage effectively under the change of water content in soils. A novel mathematical equation is proposed for describing the soil shrinkage behavior within the full water content range considering the soil-water adsorption effect. The proposed equation can be used to characterize the soil shrinkage behavior of structural and non-structural clayey soils under dry conditions. An additional parameter is introduced into the proposed equation for characterizing the slope of soil shrinkage in low water content ranges, in which the effect of soil-water adsorption is considered. Only one equation is needed to predict the complete shrinkage behavior from saturated to zero water content conditions, especially for describing the volume change of soils under low water content. The proposed equation has been validated by comparing the results between the predicted curves using the proposed model and the measured data in literatures. Comparing with existing equations for soil shrinkage curve, the results show that the proposed equation can describe the non-zero shrinkage and non-zero shrinkage slope behaviors very well under low water content conditions. Furthermore, the results show that the soil-water adsorption effect is important and necessary for prediction of soil shrinkage behavior under low water content conditions.

Key words: soil shrinkage, volume change, dry conditions, shrinkage slope, unsaturated soil, structural clay

CLC Number:

TU443

CHEN Pan, XIANG Rui, WEI Xiaoqi, WEI Changfu, WANG Jili. Equation for Soil Shrinkage Curve of Clay Considering Soil-Water Adsorption Effect[J]. Journal of Shanghai Jiaotong University, 2020, 54(8): 866-872.

Figures/Tables 8

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编号	土样	孔隙率	土粒比重	液限/%	塑限/%
1	伦敦黏土	1.30	2.75	77	29
2	伦敦黏土粉土混合	0.90	2.70	43	22
3	膨胀土 1	1.19	2.72	81	25
4	膨胀土 2	1.17	2.72	81	25
5	膨胀土 3	1.01	2.72	81	25
6	蓝黏土	1.04	2.75	63	27
7	挪威黏土	1.10	2.60	-	-

编号	土样	模型参数					相关系数
编号	土样	e₀	α	β	γ	k	R²
1	伦敦黏土	0.423	52.75	72.53	1.02	0.04	0.998
2	伦敦黏土粉土混和	0.475	1.32	5.06	1.32	0.10	0.998
3	膨胀土 1	0.458	7.47	18.49	1.59	0.12	0.998
4	膨胀土 2	0.348	0.64	0.75	2.18	0.24	0.998
5	膨胀土 3	0.454	11.83	40.24	1.50	0.14	1.000

编号	土样	公式	e₀	α	β	a	b	γ	k	R²
1	蓝黏土	(9)	0.530	13.96	77.58	-	-	1.18	0.14	0.997
2	挪威黏土		0.795	0.71	2.89	-	-	2.57	0.11	0.996
3	蓝黏土	(1)	0.544	0.35	1.12	-	-	1.37	-	0.995
4	挪威黏土		0.802	0.25	0.12	-	-	9.56	-	0.989
5	蓝黏土	(10)	0.561	-	-	0.57	5.74	-	-	0.993
6	挪威黏土		0.812	-	-	0.84	3.28	-	-	0.972