Freeze-thaw and wetting-drying effects on the hydromechanical behavior of a stabilized expansive soil

2021 ◽  
Vol 275 ◽  
pp. 122162
Author(s):  
Lu-qiang Ding ◽  
Sai K. Vanapalli ◽  
Wei-lie Zou ◽  
Zhong Han ◽  
Xie-qun Wang
Keyword(s):  
Expansive Soil ◽  
Freeze Thaw ◽  
Hydromechanical Behavior

Study of a strength prediction model of unsaturated compacted expansive soil under freeze–thaw cycles

2022 ◽  
Vol 15 (2) ◽  
Author(s):  
Zhongnian Yang ◽  
Qi Zhang ◽  
Wei Shi ◽  
Zhaochi Lu ◽  
Zhibin Tu ◽  
...  
Keyword(s):  
Prediction Model ◽  
Expansive Soil ◽  
Strength Prediction ◽  
Freeze Thaw

scholarly journals Physical and Mechanical Characteristics of Shallow Expansive Soil due to Freeze-Thaw Effect with Water Supplement

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yanlong Li ◽  
Zili Wang ◽  
Yang Luo
Keyword(s):  
Shear Strength ◽  
Water Content ◽  
Expansive Soil ◽  
Freezing Temperature ◽  
Strength Reduction ◽  
Dry Density ◽  
Direct Shear ◽  
Soil Columns ◽  
Freeze Thaw ◽  
Shear Strength Reduction

Shear strength of shallow expansive soil varies along with the depth under the freeze-thaw effect. This work investigates shear strength characteristics of shallow expansive soil by simulating the actual freeze boundary conditions of seasonal frozen areas with water supplement. An integrated approach incorporating the freeze-thaw test and direct shear test was adopted. Firstly, unidirectional freezing tests for expansive soil columns under three different freezing temperature gradients were carried out. Secondly, direct shear tests under low vertical stress were performed on the standard samples, which were prepared by using cutting rings cut the thawed expansive soil columns into nine segments along with the depth. Temperature, water content, and dry density at different depths were also investigated after the freeze-thaw process. The test results showed that, after the freeze-thaw process, the shear strength of expansive soil columns showed significant differences along with the depth and highly correlated with water content, specifically the higher water content and the lower shear strength. The minimum shear strength in the expansive soil columns occurred at the soil layer below the frozen and unfrozen zones interface. The expansive soil column’s shear strength changed most under the moderate freezing temperature gradient corresponding to the most considerable shear strength reduction. Moreover, the significant decrease in cohesion was the main reason for the shear strength reduction of expansive soil after the freeze-thaw process. These results indicate significant depth variability in shear strength of expansive soil under the freeze-thaw effect.

scholarly journals Experimental study of the freeze thaw characteristics of expansive soil slope models with different initial moisture contents

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhongnian Yang ◽  
Jianhang Lv ◽  
Wei Shi ◽  
Chao Jia ◽  
Chu Wang ◽  
...  
Keyword(s):  
Moisture Content ◽  
Expansive Soil ◽  
Soil Slope ◽  
Soil Pressure ◽  
Freeze Thaw ◽  
Moisture Contents ◽  
Thaw Cycle ◽  
Soil Slopes ◽  
Freeze Thaw Cycle ◽  
Opposite Behavior

AbstractThis paper presents an experimental investigation on the effect of freeze–thaw cycling on expansive soil slopes with different initial moisture contents. Clay soil from Weifang, China, was remolded and selected to build the expansive soil slope for the indoor slope model tests. A total of five freeze–thaw cycles were applied to the three expansive soil slopes with different moisture contents ranging from 20 to 40%. Variations of the crack developments, displacements, soil pressures and moisture contents of the expansive soil slope with different initial moisture contents during the freeze–thaw cycling were reported and discussed. The results indicate that higher moisture contents can slow the development of cracks and that the soil pressure increases with decreasing temperature. The soil pressure of slope decreases after freeze–thaw cycle, and the change amplitude of soil pressure after freeze–thaw is proportional to water content. The slopes with a moisture content of 20% and 30% shrinks during freezing and expands during thawing, which was named ES-FSTE Model, while the slope with a 40% moisture content shows the opposite behavior. During freeze–thaw cycles, moisture migrates to slope surface. As initial moisture contents increase, the soil heat transfer rate and bearing capacity decreases after five freeze–thaw cycling.

scholarly journals Freeze-Thaw Behavior of Stabilized Clayey Soil with Red Mud and Cement

2022 ◽  
Vol 11 (01) ◽  
pp. 27-30
Author(s):  
Ekrem Kalkan
Keyword(s):  
Red Mud ◽  
Clayey Soil ◽  
Expansive Soil ◽  
Engineering Properties ◽  
Clayey Soils ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle ◽  
Cement Additive ◽  
Additive Materials

The clayey soils in areas with seasonal frost are exposed to at least one freeze-thaw cycle every year and worsen their engineering properties. To prevent the engineering properties of clayey soils, it is necessary to improve the freeze-thaw resistance of them. In this study, the clayey soil was stabilized by using red mud and cement additive materials. Prepared samples of clayey soil and stabilized clayey soil were subjected to the unconfined compressive test. To investigate the effects of red mud and cement additive materials on the freeze-thaw resistance of clayey soil, the natural and stabilized expansive soil samples were exposed to the freeze-thaw cycles under laboratory conditions. The obtained results showed that the red mud and cement additive materials increased the freeze-thaw resistance of clayey soil. Consequently, it was concluded that red mud and cement additive materials can be successfully used to improve the freeze-thaw resistance of clayey soils.

Volume changes and mechanical degradation of a compacted expansive soil under freeze-thaw cycles

2019 ◽  
Vol 157 ◽  
pp. 206-214 ◽  
Author(s):  
Yang Lu ◽  
Sihong Liu ◽  
Eduardo Alonso ◽  
Liujiang Wang ◽  
Lei Xu ◽  
...  
Keyword(s):  
Expansive Soil ◽  
Mechanical Degradation ◽  
Volume Changes ◽  
Freeze Thaw

scholarly journals Effect of Curing Conditions and Freeze-Thaw Cycles on the Strength of an Expansive Soil Stabilized with a Combination of Lime, Jaggery, and Gallnut Powder

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Jijo James ◽  
S. Karthickeyan ◽  
S. Chidambaram ◽  
B. Dayanandan ◽  
K. Karthick
Keyword(s):  
South India ◽  
Expansive Soil ◽  
Strength Loss ◽  
Reaction Products ◽  
Unconfined Compression ◽  
Curing Conditions ◽  
Freeze Thaw ◽  
Stabilized Soil ◽  
Materials Used

This investigation involved the utilization of the combination of lime, jaggery, and gallnut powder, adopted in South India traditionally. This combination of materials, used for the manufacture of lime-based mortars, was adopted in stabilization of an expansive soil. Three combinations of lime, jaggery, and gallnut powder (LJG) in the ratios of 8 : 2 : 2, 8 : 2 : 1, and 8 : 1 : 2 were put into use. The effect of subjecting the combinations to alternate cycles of freeze-thaw (up to 3 cycles) and three different curing conditions of air, moisture, and heat was also investigated. In addition, a mineralogical investigation for studying the reaction products was also carried out. The investigation proceeded with the determination of the unconfined compression strength (UCS) of stabilized specimens of dimensions 38 mm × 76 mm, cured for periods of 3, 7, 14, and 28 days. The results of the investigation revealed that the addition of LJG resulted in an increase in the strength of the stabilized soil. Freeze-thaw cycles resulted in a reduction in strength with LJG821 proving to be the most optimal combination developing the maximum strength and least strength loss due to freeze-thaw cycles. Thermal curing proved to be the most optimal curing condition out of all curing conditions evaluated.

scholarly journals Dynamic Behavior of Geosynthetic-Reinforced Expansive Soil under Freeze-Thaw Cycles

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Zhongnian Yang ◽  
Xuesen Liu ◽  
Liang Zhang ◽  
Fujun Niu ◽  
Xianzhang Ling ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Expansive Soil ◽  
Soil Samples ◽  
Reinforced Soil ◽  
Frost Heave ◽  
Triaxial Tests ◽  
Foundation Engineering ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
Freeze Thaw Cycle

Expansive soil has a significant impact on the stability of many key construction projects in cold regions. To study the physical and mechanical properties of expanded soil under the condition of freeze-thaw cycle, cryogenic cyclic triaxial tests were conducted on the dynamic and the displacement characteristics of geosynthetic-reinforced expansive soil subjected to the freeze-thaw cycles. Compared with the unreinforced expansive soil samples, the effects of freeze-thaw cycles on the soil dynamics were discussed. The dynamic shear modulus (Gd) and damping ratio (λ) of the expansive soil samples are improved by reinforcement. Reinforced soil can inhibit the axial compression of the sample and restrain the frost heave deformation of the sample during the freezing process. Meanwhile, it can delay the structural damage effect caused by frost heave and reduce the rate of change of the Gd and the λ with the freeze-thaw cycle. At the same time, reinforced soil can inhibit the axial expansion, reduce the rate of reduction of the Gd, stabilize it with a higher rate, and reduce the influence of the freeze-thaw cycles on the λ of the expansive soil sample. Finally, the change of mechanical properties of expansive soil under the condition of reinforcement is obtained. The main conclusions of this paper can be used to reinforce the roadbed and foundation engineering of frozen soil in a cold region and provide support for the fiber reinforcement method of expansive soil.

scholarly journals The California Bearing Ratio and Pore Structure Characteristics of Weakly Expansive Soil in Frozen Areas

2020 ◽  
Vol 10 (21) ◽  
pp. 7576
Author(s):  
Tianguo Li ◽  
Lingwei Kong ◽  
Bingheng Liu
Keyword(s):  
Pore Size ◽  
Expansive Soils ◽  
Expansive Soil ◽  
California Bearing Ratio ◽  
Dominant Factor ◽  
Freeze Thaw ◽  
Pore Size Distributions ◽  
Compaction Energy ◽  
Gradual Variation ◽  
Compaction Degree

The California Bearing Ratio (CBR) of weakly expansive soil is specially relevant to its expansibility. The mechanisms affecting the bearing strength, in terms of the CBR, of weakly expansive soil that could be used as embankments filler are worth studying. In the present study, the effects of compaction energy on the compaction characteristics and CBR value were investigated. Additionally, the pore size distributions of soils with different compaction degrees were studied with nuclear magnetic resonance (NMR), and the effect of freeze–thaw cycles on the pore size distribution of soils with different compaction degrees was considered. Subsequently, the mechanisms influencing the CBR were analyzed at both the macroscale and microscale. A linear relationship between the CBR value and compaction degree was determined, characterizing the gradual variation of expansive soils with different moisture contents. With increasing freeze–thaw cycles, the volume of micropores decreased and mesopores increased, causing the CBR value to decrease. The expansion was a dominant factor for the CBR values. The CBR values rose with an increase in micropores and decreased with an increase in pore volume. It was considered that the tested weakly expansive soil could be used as an embankment filler in frozen areas.

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