An Overview
Introduction
Experimental study on the Ecological Slope Protection
with Aqueous Polymer Soil Stabilizers

Soil stabilizer
Laboratory test

〇Jin LIU, Bin SHI, Gonghui WANG, Toshitaka KAMAI

Field test
Conclusion

Research Centre on Lanslides

12

Introduction
The weak water stability and erosion resistance of soil
frequently leaves the slope surface on highways, railways easy
to soil erosion during rainfall conditions

The chemical modification of the soil with soil stabilizer is anew way to improve the soil. Recently Soil stabilizer has
been developed in many countries such as Japan, USA

Most of soil stabilizers were used to modify the strength ofsoil, but the erosion resistance of their modified soil is notenough to protecting the slope surface during the rainfall.

The modified effect is related to the soil and stabilizer type

In this study, a new type of soil stabilizer, namely STW,
which was developed for improving the clayey soils andprotecting the slope surface, is introduced

The clayey soil slope of highway in Nanjing, Jiangsu Province, China
34Lab tests

STW Soil StabilizerA new type of aqueous polymer emulsion
prepared using acetic-ethylene-ester polymer

Water stability

Physicochemical properties
Specific Gravity: 1.05

PH: 6-7

Viscosity: 3000mpa.sa、 Unmodified soil aggregate immersed in water (1min)b、 Modified soil aggregate immersed in water (1 hour) – 10% of STW

Environmental-friendly type561

Mechanism (SEM)包裹、连构
soil stabilizer

When soil stabilizer is applied to soil surface, it
creates the physicochemical bonds between polymer
molecules and soil aggregates through ionic,hydrogen, or Van der Waals bonds, which change
soil properties and polymer solution dynamics.

Through these bonds, long-chain polymer molecules
enwrap the aggregate’s surface and fill up the pore toform a membrane structure on the soil surface, andthen improve the water stability and erosion
resistanceunmodified

78

Field test①

levelling②

Seeding③

Diluting④

Spraying

Clayey soil
Liquid limit: 52.6%
Plasticity index: 19.7

Slope angle 35°
The clayey soil slope of highway in Nanjing, Jiangsu Province, China

Concentration 20%

Content 3L/m2

910Weather condition
maintenanceevaluation⑥⑤August 28 to September 7 (40 days after spraying )Daily rainfall in Nanjing area
3 times>100STW soil stabilizer
Plant(S+P)

Plant(P)11122

10 months later

40 days later

S+P

P

S+PP
1314Conclusions
STW is a new environmental friendly type of soil stabilizer
to improve the water stability and erosion resistance ofclayey soil
The slope surface modified with STW soil stabilizer andplant had no gully, and the plant was well growthThank you for your attention

The ecological slope protection with soil stabilizer isan effective method to reduce soil loss and improve
the stability of the soil slope

15



16

Specific gravity is around 2.7sample

17StabilityK%

immersing time（min）
12

34

56

7

8

9

10

S-0(0%)

17

20

28

32

47

50

50

50

50

50

11.5

S-1(3%)

1

12

4

55

6

9

11

1190.1S-2(5%)

0000001

3

5

7

97.5

S-3(7%)

000000001

199.7

S-4(9%)

0000000000100

183

Staining Test
The various color sample can be made from STW
soil stabilizer

Stirrer4