Study on Mechanical Properties of the Expansive Soil Treated with Iron Tailings Sand

Aiming at researching shear strength parameters of expansive soil modified by industrial waste iron tailings sand, the enhancement of expansive soil is explored from macroscopic and microscopic aspects. After characterization and testing by various means, the results show that expansive soil modifie...

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Bibliographic Details
Published inAdvances in Civil Engineering Vol. 2021; no. 1
Main Authors Chu, Chengfu, Zhang, Fei, Wu, Daoxiang, Zhan, Meihuang, Liu, Yun
Format Journal Article
LanguageEnglish
Published New York Hindawi 2021
Hindawi Limited
Wiley
Subjects
Analysis
Civil engineering
Construction sites
Density
Dry density
Expansive soils
Friction
Grain size
Industrial wastes
Internal friction
Iron
Mechanical properties
Mercury
Mine tailings
Moisture content
Optimization
Parameter modification
Particle size
Peak values
Physical properties
Pores
Sand
Sand & gravel
Shear strength
Shear strength of soils
Shear tests
Soil improvement
Soil mechanics
Soil moisture
Soil properties
Soil strength
Soil treatment
Soils
Tailings
Tailings (Metallurgy)
Testing
China
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Summary:Aiming at researching shear strength parameters of expansive soil modified by industrial waste iron tailings sand, the enhancement of expansive soil is explored from macroscopic and microscopic aspects. After characterization and testing by various means, the results show that expansive soil modified by iron tailings sand will increase the maximum dry density of the improved soil and reduce its optimal moisture content, which is beneficial in tuning the moisture content at the construction site. In addition, iron tailings sand can improve the shear strength of expansive soils. The influence of iron tailings sand on cohesion increases first, then decreases, and reaches the peak value at 30%, while the effect on internal friction angle exhibits a continuously increasing trend. Furthermore, according to mercury intrusion tests and microangle analysis, the addition of iron tailings sand can reduce the tiny pores and enhance the occlusal force of the soil. Simultaneously, it increases the number of large pores, maximizing the macroscopic strengthening of iron tailings sand towards the expansive soil.
ISSN:1687-8086
1687-8094
DOI:10.1155/2021/9944845