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Analysis of the Influence of Mud Content on the Engineering Characteristics of Sand Sulfate Saline Soil
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[1]ZHANG Shasha,ZHANG Chao,WANG Xuchao,et al.Analysis of the Influence of Mud Content on the Engineering Characteristics of Sand Sulfate Saline Soil[J].Journal of Zhengzhou University (Engineering Science),2024,45(01):98-106.[doi:10.13705/j.issn.1671-6833.2024.01.001]
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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 45 Number of periods: 2024 01 Page number: 98-106 Column: Public date: 2024-01-19
Title:
Analysis of the Influence of Mud Content on the Engineering Characteristics of Sand Sulfate Saline Soil
Author(s):
ZHANG Shasha;  ZHANG Chao;  WANG Xuchao;  ZHAO Yanhu
School of Highway, Chang′an University, Xi′an 710064, China
Keywords:
sand soil;  saline soil;  salt swelling test;  triaxial shear test;  fine-grained soil content;  SEM test
CLC:
-
DOI:
10.13705/j.issn.1671-6833.2024.01.001
Abstract:
In order to study the influence of mud content on salt swelling and mechanical properties of sand sulfate soils, sand sulfate soils with different fine-grained soil content were manually configured. Based on the unidirectional freezing salt swelling test with 1% and 3% salt content, sand samples with fine-grained soil mass fraction of 5%, 15%, and 30% were selected to conduct triaxial shear tests at constant and low temperature. The results showed that with the conditions of this test, the freezing temperature of sand sulfate saline soil of different levels was within the range of -0. 7--0. 1 ℃ . When the pore solution concentration of the soil samples reached saturation above the freezing temperature, salt crystals could first be generated in the cooling process. With the condition of 1% salt content, the initial swelling temperature of sand samples with high fine-grained soil content (≥30%) was in the range of 4-9 ℃ , while the initial swelling temperature of sand samples with low fine-grained soil content was near 0 ℃ . The swelling temperature of 3% salt content sand sample was 20-23 ℃ . The process of salt frost heave was inseparable from the participation of free water. The test water content and fine-grained soil content had a significant effect on salt frost heave by influencing the content of free water in the soil. In terms of mechanical properties, with the increase of the content of fine-grained soil, the shear strength of sand sulfate soils increased first and then decreased, and the fine-grained soil changed from enhancing friction to " lubrication " between particles. In addition, after freezing, the sand was transformed into a " soil-salt-ice skeleton structure " with a stronger bearing capacity, and the shear strength increased greatly, showing obvious brittle failure characteristics. Affected by relative temperature, the failure stress of frozen sand decreased first and then increased with the increase of salt content.
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Last Update: 2024-01-25
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