Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (1): 83-90.doi: 10.6040/j.issn.1672-3961.0.2017.366

• Civil Engineering • Previous Articles     Next Articles

Study on modification of lake deposition high liquid limit clay in the Yellow River flood area

Xueyong ZHU1,2(),Haiwei LIU3,Xiaoyan MA4,Qingtao XING2,Xiaoqun LIN5,Tieqiang MAN5   

  1. 1. School of Civil Engineering, Shandong University, Jinan 250061, Shandong, China
    2. Shandong Transportation Institute, Jinan 250104, Shandong, China
    3. Shandong Ping′an Engineering Quality Inspection Co., Ltd, Yantai 265500, Shandong, China
    4. Road Bureau, Shandong Provincial Department of Transport, Jinan 250002, Shandong, China
    5. The Third Engineering Co., Ltd, China Railway Construction Bridge Engineering Bureau Group, Shenyang 110000, Liaoning, China
  • Received:2017-08-03 Online:2019-02-20 Published:2019-03-01

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Abstract:

By adding different dosages of lime, fly ash and lime fly ash to the high liquid limit clay in areas formerly flooded by the Yellow River, the liquid-plastic limit test was conducted to investigate the law of material liquid limit and plastic index changing with the number of days, thereby determining the optimal modification dose and effect. The test showed that the main mineral content of high liquid limit soil in areas formerly flooded by the Yellow River was illite, montmorillonite and kaolinite, which had good hydrophily and a liquid limit of about 50%. It had expansibility, easy foaming nature, and poor water stability, with a bearing ratio (CBR) value of less than 3% after 4 d of water immersion; the addition of 4% lime and the 3:9 ratio of lime powder and coal ash in lime-fly ash soil could reduce the hydrophily and expansibility of the material, and improved water stability. The modified soil's CBR reached 8% under the 88% compaction rate after 4 d of water immersion, which met the filling requirements of roadbed area.

Key words: areas formerly flooded by the Yellow River, high liquid limit clay, montmorillonite, expansibility, CBR

CLC Number: 

  • U419

Table 1

Mineral composition of high liquid limit clay"

非黏土矿物质量分数/% 黏土矿物质量分数/%
总量 石英 长石 云母 方解石 白云石 角闪石 总量 蒙脱石 伊利石 高岭石 绿泥石
60 20 20 10 7 3 微 40 11.2 19.6 4 5.2

Table 2

The characteristics of kaolinite, illite and montmorillonite"

黏土矿物 高岭石 伊利石 蒙脱石
来源 蒙脱石脱硅及原生矿物脱去盐基 白云母、正长石等含钾量高的岩石脱钾 原生矿物脱去盐基;次生矿物脱钾
晶体类型 1:1 2:1 2:1
层间力 氢键力 静电力 范德华力
类质同像 无 特别发育 广泛发育
层间离子 无 K+ Na+、Ga2+
电荷来源 晶体侧边断键 Al3+置换Si4+ Fe2+、Fe3+、Mg2+置换Al3+
晶格刚性 大 大 小

Table 3

Particle composition of high liquid limit clay"

%
土样编号 质量分数
>0.075 mm 0.075~0.05 mm 0.05~0.01 mm 0.01~0.005 mm 0.005~0.002 mm < 0.002 mm
1# 6.4 3.7 46.3 14.1 15.2 24.3
2# 5.8 2.1 29.0 15.0 19.4 28.7
3# 2.7 3.7 38.9 12.3 17.2 26.2

Table 4

Liquid & plastic limit of high liquid limit clay"

土样编号 液限/% 塑限/% 塑性指数
1# 45.4 21.9 23.5
2# 58.1 27.1 31.0
3# 47.7 23.4 24.3
红黏土[21] 58.8 30.8 28.0

Table 5

Four days soaking CBR value"

含水率/
%		 压实度/
%		 吸水率/
%		 膨胀率/
%		 浸水CBR/
%
17 90 12.4 5.8 0.7
93 10.9 5.6 0.8
96 8.1 4.9 0.8
20 90 11.3 6.1 0.5
93 9.6 5.7 0.6
96 6.4 4.4 0.6
23 90 8.7 5.3 0.4
93 6.3 4.7 0.5

Table 6

The liquid limit of different lime content changes with time"

石灰与风干土质量比/% 素土液限 石灰改性土液限
1 d 2 d 3 d 4 d
2 58.5 52.9 54.4 50.0
3 58.1 56.0 48.8 51.0 46.2
4 55.7 47.8 48.5 45.9

Table 7

Plasticity index of different dosage of lime change with time"

石灰与风干土质量比/% 素土塑性指数 石灰改性土塑性指数
1 d 2 d 3 d 4 d
2 30.1 29.7 27.8 27.4
3 31.0 28.9 28.2 26.7 26.6
4 27.4 27.1 25.7 26.2

Fig.1

The liquid limit change curves with time"

Fig.2

Plasticity index change curves with time"

Table 8

The liquid limit of different fly ash content varies with time"

粉煤灰与风干土的质量比/% 初始液限 粉煤灰改性土液限
2 d 3 d 4 d
10 56.1 55.8 59.1
15 58.1 57.8 56.5 58.9
20 53.7 55.3 57.8
25 57.2 56.9 56.9

Table 9

Plasticity index of soil with different dosage of fly ash varies with time"

粉煤灰与风干土的质量比/% 素土塑性指数 粉煤灰改性土塑性指数
2 d 3 d 4 d
10 32.2 30.6 32.1
15 31.0 32.2 30.2 31.6
20 29.1 29.6 30.3
25 32.8 30.4 30.6

Fig.3

The liquid limit change curves with time"

Fig.4

Plasticity index change curves with time"

Table 10

Lime-fly ash soil liquid limit changes with time"

配比 石灰内掺量/% m(石灰): m(粉煤灰):m(土) 二灰内掺量/% 素土液限/% 二灰改性土液限
1 d 2 d 3 d 4 d 5 d
1 1 1.0:1.5:97.5 2.5 57.2 56.7 55.4 52.3 51.2
2 1 1.0:2.0:97.0 3.0 56.0 57.9 54.6 52.4 51.1
3 1 1.0:3.0:96.0 4.0 55.1 54.8 53.4 53.7 50.8
4 2 2.0:3.0:95.0 5.0 54.8 53.6 52.9 51.1 49.6
5 2 2.0:4.0:94.0 6.0 58.1 53.9 50.7 50.2 48.9 48.7
6 2 2.0:6.0:92.0 8.0 53.3 52.6 51.8 50.9 47.9
7 3 3.0:4.5:92.5 7.5 51.0 50.1 51.2 49.9 48.9
8 3 3.0:6.0:9.0 9.0 43.7 44.9 43.4 44.1 42.9
9 3 3.0:9.0:88.0 12.0 42.9 41.9 41.1 40.3 40.1

Table 11

Lime-fly ash soil plasticity index changes with time"

配比 石灰内掺量/% m(石灰): m(粉煤灰):m(土) 二灰内掺量/% 素土塑性指数 二灰改性土塑性指数
1 d 2 d 3 d 4 d 5 d
1 1 1.0:1.5:97.5 2.5 30.5 30.8 28.8 24.8 24.7
2 1 1.0:2.0:97.0 3.0 30.7 29.6 30.2 30.0 25.7
3 1 1.0:3.0:96.0 4.0 28.2 29.2 30.1 28.7 28.2
4 2 2.0:3.0:95.0 5.0 25.2 25.6 25.7 22.4 21.5
5 2 2.0:4.0:94.0 6.0 31.0 27.4 26.1 23.9 24 24.6
6 2 2.0:6.0:92.0 8.0 27.1 24.4 22.2 21.6 20.4
7 3 3.0:4.5:92.5 7.5 21.2 22.2 21.2 20.2 20.8
8 3 3.0:6.0:9.0 9.0 21.8 21.2 20.2 21.2 20.8
9 3 3.0:9.0:88.0 12.0 20.5 19.9 18.2 18.9 16.7

Fig.5

The liquid limit and plasticity index change curves with time when lime:fly ash was 1:1.5"

Fig.6

The liquid limit and plasticity index change curves with time when lime:fly ash was 1:2"

Fig.7

The liquid limit and plasticity index change curves with time when lime:fly ash was 1:3"

Fig.8

CBR values of lime soil and lime-fly ash soil"

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