The Microstructure Characters of Saline Soil in Qarhan Salt Lake Area and Its Behaviors of Mechanics and Compressive Strength

Liu, Junyong; Zhang, Liujun

doi:10.1007/s13369-014-1410-2

Cited by 35 publications

(21 citation statements)

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“…The specic gravity of both soil samples was measured as 2.71 by a pycnometer (ne gravel soil) and a jar (natural gravel soil), indicating that the inuence of grain composition on specic gravity is very limited. In accordance with the Test Methods of Soils for Highway Engineering JTG E40-2007, 27 a standard compaction test was carried out on the test gravel soil. As a result, a compaction curve was obtained, as shown in Fig.…”

Section: Gravel Soil Basementioning

confidence: 99%

Study on frost heaving characteristics of gravel soil pavement structures of airports in Alpine regions

2017

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Section: Gravel Soil Basementioning

confidence: 99%

Study on frost heaving characteristics of gravel soil pavement structures of airports in Alpine regions

2017

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“…For example, Liu et al (2016) characterized the mineralogy, microstructure, and particle morphology of loess soil in the Loess Plateau region of China, to elucidate the origin of its collapse behaviour. Liu and Zhang (2014) investigated relationships among the types of connections between particles in the soil skeleton and the mechanical properties of saline soils with different salt contents. They found that there are three forms of soil particle connections, namely, point contact, stacked contact, and salt crystal cementation, of which salt crystal cementation was demonstrated to be an important factor affecting the mechanical strength‐related properties of saline soils.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, scholars have carried out in‐depth research on the frost heave effect of saline‐alkali soils and have obtained significant findings. Factors such as salinity and freeze–thaw times contribute to changes in the structure of the soil, resulting in corresponding changes in soil properties (Jamshidi, Lake, Gunning, & Hills, 2016; Liu & Zhang, 2014; Tang & Yan, 2015). Changes in soil microstructure that occur due to multiple freeze–thaw cycles result in a decrease in the shear strength, modulus of elasticity, cohesion, and other shear properties of saline soil (Han et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

An evaluation of the effects of microstructural characteristics and frost heave on the remediation of saline‐alkali soils in the Yellow River Delta, China

Geng

et al. 2020

Land Degrad Dev

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In the Yellow River Delta of China, soil salinization is of serious concern from both agricultural and environmental perspectives. In this study we investigated the microstructural characteristics of saline‐alkali soils in this region and explored the influence of frost heave on soil microstructure. Soil mineral composition, pore distribution, particle arrangement, and pore characteristics were measured using X‐ray diffraction (XRD), mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM). Soil pore characteristics, overall porosity, and unconfined compressive strength (UCS) were measured at water content of 10, 15, 20, 25% (w/w) before and after freezing at −10°C. The results showed that deterioration of soil physical properties was largely caused by dense particle arrangement, high proportion of ultra‐micropore‐specific surface area, and poor pore distribution, rather than mineral content or particle size distribution. The microstructure of saline‐alkali soil was greatly improved by frost heave with the overall porosity and UCS of frost heave‐treated soil samples significantly higher than for the control. Moreover, particle cementation decreased with increasing soil water content. This study demonstrated that a combination of XRD, SEM, and MIP offers accurate evaluation of the microstructural characteristics of saline‐alkali soils, and frost heave may serve as an economically sustainable and technically feasible method for saline‐alkali soil amelioration in the Yellow River Delta.

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“…Previous studies have shown that freeze-thaw cycles will change the grain size distribution of soil, which will result in changes of the particle content in different particle groups [11,12]. In addition, the salt in the soil has an agglomeration effect on the soil particles, thus changing the microstructure type of the soil [13,14]. These factors will change the size, shape, and arrangement characteristics of the pores in the soil [15,16].…”

Section: Introductionmentioning

confidence: 99%

Relationship between the Shear Strength and Microscopic Pore Parameters of Saline Soil with Different Freeze-Thaw Cycles and Salinities

Wang

Lin

et al. 2020

Symmetry

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Saline soil is a widely distributed special soil with poor engineering properties. In seasonally frozen regions, the poor properties of saline soil will cause many types of engineering damage such as road boiling, melt sinking, and subgrade instability. These engineering failures are closely related to the shear strength of saline soil. However, there are relatively few studies on saline soil in cold regions. The strength of the soil is always determined by its microstructure; therefore, the study aims to investigate the relationship between the shear strength and microscopic pore structure of saline soil with different freeze–thaw cycles and salinities. The shear strength characteristics of saline soil with different salinities subjected to different freeze–thaw cycles were obtained by triaxial tests. In addition, the microstructure of the soil samples was investigated by scanning electron microscopy (SEM) tests, and the microscopic pore parameters of the soil samples, including porosity (N), average pore diameter (D¯), average shape coefficient (K), surface fluctuation fractal dimension (F), and orienting probability entropy (Hm), were obtained by image processing software quantitatively. Based on the experimental results, the influence of freeze–thaw cycles and salinity on the shear strength characteristics and microstructure of the soil samples were analyzed. Besides that, in order to effectively eliminate the collinearity between independent variables and obtain a stable and reasonable regression model, principal component regression (PCR) analysis was adopted to establish the relationship between the microscopic pore parameters and the failure strength of the soil samples. The fitting results demonstrated that the failure strength of saline soil is mainly related to the size and direction of the pores in the soil, and it has little correlation with pore shape. The failure strength of the soil was negatively correlated with the average pore diameter (D¯) and porosity (N), and it was positively correlated with the orienting probability entropy of the pores (Hm). This study may provide a quantitative basis for explaining the variation mechanism of the mechanical properties of saline soil from a microscopic perspective and provide references for the symmetry between the changes of the macroscopic properties and microscopic pore structure of the saline soil in cold regions.

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The Microstructure Characters of Saline Soil in Qarhan Salt Lake Area and Its Behaviors of Mechanics and Compressive Strength

Cited by 35 publications

References 0 publications

Study on frost heaving characteristics of gravel soil pavement structures of airports in Alpine regions

Study on frost heaving characteristics of gravel soil pavement structures of airports in Alpine regions

An evaluation of the effects of microstructural characteristics and frost heave on the remediation of saline‐alkali soils in the Yellow River Delta, China

Relationship between the Shear Strength and Microscopic Pore Parameters of Saline Soil with Different Freeze-Thaw Cycles and Salinities

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