Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (11): 3632-3640.doi: 10.13229/j.cnki.jdxbgxb.20240195

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Strength and deformation characteristics of gangue-red clay subgrade in hot and humid areas in south China

Bing-xu WEI1(),Jing ZENG1,Chu-fang CHEN2   

  1. 1.School of Transportation Engineering，Changsha University of Science & Technology，Changsha 410114，China
    2.Guangxi Road Construction Engineering Group Co. ，Ltd，Nanning 530029，China
  • Received:2024-02-28 Online:2025-11-01 Published:2026-02-03

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Abstract:

In order to address the stability and durability issues of coal gangue-red clay subgrade in hot and humid areas of southern China， this study investigates the strength and deformation characteristics of a coal gangue-red clay mixture through a series of laboratory tests， including compaction， UCS， CBR， and triaxial tests. The results demonstrate that the maximum dry density initially increases and then decreases with increase of clay content， while the optimum moisture content gradually increases with higher clay content. The UCS value and CBR value exhibit an initial increase followed by a decrease as the clay content rises until reaching their peak at 40%. Permanent deformation initially decreases but then increases with increasing clay content. It also increases with higher deviator stress， loading cycles， and wet-dry cycles but decreases with increased confining pressure. Based on these findings， a comprehensive prediction model for permanent deformation is established considering physical state， stress state， loading state as well as environmental conditions. These research findings can provide valuable references for construction practices in filling coal gangue-red clay subgrade.

Key words: road engineering, coal gangue-red clay, dry and wet cycle, durable service, prediction model

CLC Number: 

  • U414

Table 1

Mineral composition of coal gangue"

成分石英方解石橄榄石钙镁石硅酸镁氧化铝其他
占比/%41.227.814.66.52.10.77.1

Table 2

Main property indexes of soil"

土样名称最大干密度/（g·cm3）最佳含水率/%液限/%塑限/%塑性指数比重粒径分布/%
＜0.0020.002~0.0750.075~2
红黏土1.8618.253.826.127.72.7179.413.27.4

Fig.1

Test equipment"

Table 3

Triaxial test condition"

参考变量试验数值
黏土掺入量/%0、20、40、60、80
围压/kPa20、40、60
偏应力/kPa20、40、60
加载次数10 000
干湿循环次数0、1、2、3、4、5
加载时间/s0.2
间歇时间/s0.8

Fig.2

Results of the compaction test"

Fig.3

Internal structure diagram of coal gangue and red clay at different clay dosage"

Fig.4

The results of strength characteristic test"

Fig.5

Change curve of the final value of permanent deformation with the amount of clay added under the condition of 40 kPa confining pressure and 0 dry-wet cycles"

Fig.6

Change curve of the final value of permanent deformation with confining pressure and deviating stress under the condition of 40% clay inclusion and 0 dry and wet cycles"

Fig.7

Change curve of permanent deformation with loading times under the conditions of 40% clay inclusion， 40 kPa confining pressure and 0 dry-wet cycles"

Fig.8

Change curve of permanent deformation with the number of dry and wet cycles under 40% clay inclusion， 40 kPa confining pressure and 40 kPa deviating stress"

Table 4

Results of model fitting"

α1α2α3α4α5α6R2RMSE
0.160.211.550.110.130.370.910.11

Fig.9

Prediction model validation results"

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