Study on Dispersive Influencing Factors of Dispersive Soil in Western Jilin Based on Grey Correlation Degree Method

Bao, Shuo Chao; Wang, Qing; Bao, Xin Hua

doi:10.4028/www.scientific.net/amm.291-294.1096

Cited by 10 publications

(9 citation statements)

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“…Wang et al [40] proposed that the saline soil is structural in nature. In terms of dispersion, Bao et al [41] and Zhang et al [42,43] researched the dispersion properties of the area, finding saline soil to be dispersed in nature. In terms of mechanical properties, Han et al [27] studied the action of freeze-thaw cycles on the unconsolidated-undrained shear strength of saline soil in western Jilin Province, China.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Undrained Shear Properties of Saline Soil under Freeze-Thaw Cycles

Cheng

Wang

et al. 2021

Geofluids

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The freeze-thaw cycle is an important external factor affecting the hydromechanical characteristics of saline soil in cold regions. Due to the presence of water and salt, it has a greater impact on stability. The construction of various projects, such as ditch fills and road subgrades, has mostly used disturbed soils. Therefore, this article takes remolded saline soil in Qian’an, Jilin Province, China, as the research object to evaluate the action of freeze-thaw cycles on the critical state line, effective stress path, pore water pressure-strain relationship, stress-strain relationship, shear strength index, and other mechanical properties via a freeze-thaw cycle test and a consolidated undrained triaxial shear test (CU). The experimental results show that regardless of whether the soil specimen undergoes a freeze-thaw cycle, its stress-strain relationship shows characteristics of strain hardening, while, as the number of freeze-thaw cycles increases, the shear strength gradually decreases. As both the confining pressure and number of freeze-thaw cycles increase, the pore water pressure increases, as does the pore water pressure coefficient in shear failure. Under the action of freeze-thaw cycles, on the p ′ − q plane of the stress space, the effective stress path gradually moves to the lower left side. Both the effective stress path and the pore water pressure characteristics indicate that the degree of consolidation of the soil specimens continuously decreases as the number of freeze-thaw cycles increases. The position of the critical state line gradually lowers, and the critical state stress ratio decreases. The effective stress strength index can more accurately reflect the comprehensive influence of freeze-thaw cycles and confining pressure on the mechanical characteristics of soils than the total stress strength index. Logistic functions can be used to fit and predict the degradation law of the internal friction angle and cohesion.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Undrained Shear Properties of Saline Soil under Freeze-Thaw Cycles

Cheng

Wang

et al. 2021

Geofluids

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“…Western Jilin Province is one of the most problematic areas of soil salinization in China, and is also a typical seasonal frozen distribution area [7]. The area's freeze-thaw cycles and dry-wet cycles make this ecosystem fragile, as salt migrates upward and the area of saline soil increases year by year [8]. The geological characteristics of the saline soil have led to aggravation of road diseases in the area, such as salt heaving, frost heaving, and frost boiling [9].…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Structural Yield Strength of Saline Soil in Western Jilin Province, China: A Comparison of the Back-Propagation Neural Network and Support Vector Machine Models

et al. 2020

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With the increase in transportation emissions, road diseases in the saline soil area of Jilin Province have become a problem that requires serious attention. In order to improve the subgrade performance, the structural yield strength (SYS) of remolded soil and its factor sensitivity are investigated in this study. Saline soils in Western Jilin are structural in the sense that the bonding strength of soil skeleton is mainly provided by the solidification bond formed by a physicochemical interaction between particles. Its SYS is influenced by its cementation type, genetic characteristics, original rock structure, and environment. Because of the high clay content in Zhenlai saline soil, the specific surface area of soil particles is large, and the surface adsorption capacity of soil particles is strong. In addition, the main cation is Na+. The cementation strength of bound water film between soil particles is thus easily affected by water content and salt content, and compaction is also an important factor affecting the strength of soil. Therefore, in this study, the back-propagation neural network (BPNN) model and a support vector machine (SVM) are used to explore the relationship of saline soil’s SYS with its compactness, water content, and salt content. In total, 120 data points collected by a high-pressure consolidation experiment are applied to building BPNN and SVM model. For eliminate redundant features, Pearson correlation coefficient (rPCC) is used as an evaluation standard of feature selection. The K-fold cross-validation method was used to avoid over fitting. To compare the performance of the BPNN and SVM models, three statistical parameters were used: the determination coefficient (R2), root mean square error (RMSE), and mean absolute percentage deviation (MAPD). The result shows that the average values of R2, RMSE, and MAPD of the BPNN model are superior to the values of the SVM. We conclude that the BPNN model is slightly better than the SVM for predicting the SYS of saline soil. Thus, the BPNN model is used to analyze the factor sensitivity of SYS. The results indicate that the influence degrees of the three parameters are as follows: water content > compactness > salt content. This study can provide a basis for estimating the structural yield pressure of soil from its basic properties, and can provide a new way to obtain parameters for geotechnical engineering, ensuring safety while maintaining symmetry in engineering costs.

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“…China is also a large country in the distribution of saline soil, and Song-nen plain is located in China's largest and the third largest soda-type saline soil agglomeration area in the world. In the history of the study of salinization in the Song-nen Plain, the results achieved were mainly focused on issues related to agriculture such as soil improvement, for the basic physicochemical properties of soda-type saline soils, there are relatively few special studies on the engineering properties such as salt heave swelling, collapse, corrosion and other factors that affect these engineering properties [1][2].…”

Section: Introductionmentioning

confidence: 99%

Research Progress and Current Situation of Saline Soil in Song-nen Plain

Ying¹,

Wang²,

Anping³

et al. 2018

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This paper mainly introduces the research development and current situation of saline soil in China and abroad, and the research status of the soda-type saline soil in the Song-nen Plain. At present, people's research on saline soils mainly focuses on the saline soil disease mechanism and prevention measures, although certain achievements have been made, it is not clear enough about the mechanism of the occurrence of the special properties of saline soil and the interrelationship between the influences of various factors on it, faced with the problem of engineering construction, the intensity and work of the research are still far from adequate. In particular, there are relatively few studies on the related engineering properties of soda-type saline soil. The research on soda saline soil is focused on agricultural improvement, there are few studies on the properties of the related engineering; The study causes analysis to single factor, qualitative primarily, lack of quantitative and systematic.

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Study on Dispersive Influencing Factors of Dispersive Soil in Western Jilin Based on Grey Correlation Degree Method

Cited by 10 publications

References 0 publications

Experimental Study on Undrained Shear Properties of Saline Soil under Freeze-Thaw Cycles

Experimental Study on Undrained Shear Properties of Saline Soil under Freeze-Thaw Cycles

Prediction of the Structural Yield Strength of Saline Soil in Western Jilin Province, China: A Comparison of the Back-Propagation Neural Network and Support Vector Machine Models

Research Progress and Current Situation of Saline Soil in Song-nen Plain

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