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

Lu, Yang; Liu, Sihong; Alonso, Eduardo E.; Wang, Liujiang; Xu, Lei; Li, Zhuo

doi:10.1016/j.coldregions.2018.10.008

Cited by 124 publications

(33 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…where P(n) is the porosity of saturated undisturbed loess when the number of freeze-thaw cycles is n; P 0 is the porosity of saturated undisturbed loess during unfrozen and thaw. The most obvious manifestation of the damage caused by the freeze-thaw cycle is the increase of the porosity of the porous sample [29]. Therefore, the change in porosity can directly reflect the evolution of freeze-thaw damage.…”

Section: Changes In Porositymentioning

confidence: 99%

“…In order to study the relationship between surface porosity and volume porosity in detail, the parameters k and the concept of feature voxels S e V are introduced to obtain the relationship between surface porosity and volume porosity [31]. The most obvious manifestation of the damage caused by the freeze-thaw cycle is the increase of the porosity of the porous sample [29]. Therefore, the change in porosity can directly reflect the evolution of freeze-thaw damage.…”

Section:  mentioning

confidence: 99%

See 1 more Smart Citation

The Influence of Regional Freeze–Thaw Cycles on Loess Landslides: Analysis of Strength Deterioration of Loess with Changes in Pore Structure

Yang

Liu

2020

Water

View full text Add to dashboard Cite

The loess landslide in Gaoling District of Xi’an, Shaanxi in China is closely related to the seasonal freeze–thaw cycle, which is manifested by the destruction of pore structure and strength deterioration of the loess body under freeze–thaw conditions. In order to study the relationship between macro-strength damage and pore structure deterioration of saturated loess under freeze–thaw conditions and its influence on the stability of landslides, this paper explores the effect of freeze–thaw cycles on the strength of saturated undisturbed loess through triaxial compression test, and explores the micro-microstructure changes of saturated undisturbed loess through scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR). This is to analyze the evolution of the pore structure and strength loss evolution of saturated loess during the freeze–thaw process, and to describe the freeze–thaw damage of saturated undisturbed loess through the change of porosity and strength deterioration. Then, the internal correlation expression between the porosity change and the strength degradation is established to realize the verification analysis of the test data based on the correlation model. The research results show that: (1) As the number of freeze–thaw cycles increases, the peak strength loss rate gradually increases, and the strength deterioration of saturated loess becomes more and more obvious. (2) The freeze–thaw cycle will lead to the development of pores and cracks in the sample, accompanied by the generation of new cracks, which will cause the deterioration of the pore structure of the sample as a whole. (3) The response of strength damage and porosity deterioration of saturated undisturbed loess is roughly similar under the freeze–thaw cycle. The change in porosity can be measured to better reflect the strength deterioration of saturated loess. Therefore, the change of pore structure of undisturbed loess under freeze–thaw cycle conditions is tested by field sampling and indoor tests to reflect the phenomenon of strength deterioration, thereby analyzing the stability of loess slopes.

show abstract

Section: Changes In Porositymentioning

confidence: 99%

Section:  mentioning

confidence: 99%

The Influence of Regional Freeze–Thaw Cycles on Loess Landslides: Analysis of Strength Deterioration of Loess with Changes in Pore Structure

Yang

Liu

2020

Water

View full text Add to dashboard Cite

show abstract

“…The F-T cycle has been set at freezing temperature −20 °C for the first 12 hrs and then thawing temperature +20 °C to another 12 hrs 69 . The F-T test has been carried out up to 10 cycles, considering the expansive soil, which shows stable deformation and strength characteristics after an adequate F-T cycle 70 . After every two F-T cycles i.e., 0, 2, 4, 6, 8, 10, the one specimen has been taken out from each sample type and tested under UPV, UCS, STS experiments…”

Section: Mechanical Property Analysismentioning

confidence: 99%

Effect of Curing on Micro-Physical Performance of Polypropylene Fiber Reinforced and Silica Fume stabilized Expansive Soil Under Freezing Thawing Cycles

Tiwari

Satyam

Singh

2020

Sci Rep

View full text Add to dashboard Cite

This study presents the micro-physical investigation of polypropylene (PP) fiber-reinforced, and silica fume (SF) stabilized expansive soil (BC) subgrade. The coupling effect of soil, PP fiber, and SF has been evaluated under the freezing-thawing (F-T) cycle to assess the durability of treated BC Soil. The curing method and duration staggeringly influence the strength of SF treated BC soil; therefore, three different curing method, i.e., moisture-controlled curing (MC), gunny bag curing (GC), and water submerged curing (SC) to a period of 7, 14, and 28 days were considered. The BC soil has been reinforced with 0.25%, 0.50%, and 1.00% PP fiber and stabilized with 2%, 4%, 6% and 8% SF. The physical, chemical, and microstructural properties were determined before and after 2,4,6,8,10 F-T cycles. With the increase in SF content, the unconfined compressive strength of the expansive soil has been increased due to the formation of Calcium Silicate Hydrate (C-S-H) gel. The chemically inert, hydrophobic, non-corrosive nature, and higher tensile strength of PP fiber, it has a higher potential to reinforce the BC soil for durability under tensile failure. This research confirms the possibility of incorporating SF and PP Fiber in road work applications, with significant environmental benefits.

show abstract

“…Yin et al [48] analyzed transport of liquid water, vapor, stress, and heat in unsaturated freezing soil. Lu et al [40,49] and Tang et al [50] analyzed cracking characteristics and established constitutive relations and mechanical degradation of expansive soil under freeze-thaw cycles. Liu et al [51] researched mechanical behavior and the constitutive model of tailing soils subjected to freeze-thaw cycles.…”

Section: Loess Structural Strength and Damage Variablesmentioning

confidence: 99%

Structural Strength Deterioration Characteristics and a Model of Undisturbed Loess under the Action of Wetting and Freeze‐Thaw Cycles

She

et al. 2019

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Undisturbed loess is affected by external environmental disturbances, such as wetting and freeze-thaw cycles, which cause microstructural changes that have an important impact on the structural strength of the loess. These changes in turn affect the stability of structures such as embankments, slopes, and guards. This article takes the Q3 undisturbed loess in Lintong District, Xi’an, as an example. The effects of wetting and freeze-thaw cycles on the loess expansion ratio and pore structure were studied by wetting tests, freeze-thaw cycle tests, and scanning electron microscopy (SEM). The changes in the compression index and compression modulus were studied by a confined compression test. The loess e-lgp compression curve was obtained according to the confined compression test, and the newly defined concepts of the loess structural strength, residual structural strength, and structural strength damage variable, in addition to the e-lgp compression curve, were combined with the experimental data to calculate the damage value generated by the disturbance during the sampling and preparation of loess. The deterioration of the structural strength and damage variable of loess was analyzed. Based on the microscopic statistical damage theory and Weibull distribution, the model used the volume expansion ratio as a variable to establish a statistical damage model under wetting and freeze-thaw cycles. Finally, on the basis of the test, the model parameters were determined. The models were verified by taking loess from a foundation pit in the northern suburbs of Xi’an and were in good agreement with the results of the test. Ultimately, the models have good practicability and can provide guidance for engineering design and construction.

show abstract

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

Cited by 124 publications

References 51 publications

The Influence of Regional Freeze–Thaw Cycles on Loess Landslides: Analysis of Strength Deterioration of Loess with Changes in Pore Structure

The Influence of Regional Freeze–Thaw Cycles on Loess Landslides: Analysis of Strength Deterioration of Loess with Changes in Pore Structure

Effect of Curing on Micro-Physical Performance of Polypropylene Fiber Reinforced and Silica Fume stabilized Expansive Soil Under Freezing Thawing Cycles

Structural Strength Deterioration Characteristics and a Model of Undisturbed Loess under the Action of Wetting and Freeze‐Thaw Cycles

Contact Info

Product

Resources

About