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A platform for research: civil engineering, architecture and urbanism
Shearing Infiltration Tests to Study Mechanical Behavior and Failure Mechanism of Shallow Slopes
https://orcid.org/http://orcid.org/0000-0003-4187-2609
An experimental series of shearing infiltration triaxial tests were performed on compacted unsaturated soil to simulate the behavior of shallow slope failures. Soil samples were compacted at moisture contents from dry to wet optimum moisture content with the degree of saturation varying from 24.0 to 59.5% while maintaining the degree of compaction at 80%. Two series of shearing infiltration triaxial tests were performed in this study. In Series-I, just before the start of shearing, matric suction was decreased by increasing pore water pressure to start water infiltration; that is, shearing was performed simultaneously with water infiltration. In Series-II, the soil was first sheared with drained pore air and undrained pore water to pre-defined value of deviatoric stress. After that, matric suction was decreased by increasing pore water pressure to start water infiltration and shearing was performed by keeping deviatoric stress constant on the specimen. The test results showed that the decrease in matric suction has an effect on the volume of infiltrated water and degree of saturation. The triaxial test results indicated that the shear strength of unsaturated soil is higher if the soil is compacted on the dry side of optimum moisture content. Under such conditions, a higher reduction in suction is required to start the water infiltration. In addition to this, the triaxial test results also indicated that when the soil is under constant deviatoric stress, i.e., 80–90% of maximum deviatoric stress, the contribution of water infiltration toward soil failure is quite high.
Shearing Infiltration Tests to Study Mechanical Behavior and Failure Mechanism of Shallow Slopes
https://orcid.org/http://orcid.org/0000-0003-4187-2609
An experimental series of shearing infiltration triaxial tests were performed on compacted unsaturated soil to simulate the behavior of shallow slope failures. Soil samples were compacted at moisture contents from dry to wet optimum moisture content with the degree of saturation varying from 24.0 to 59.5% while maintaining the degree of compaction at 80%. Two series of shearing infiltration triaxial tests were performed in this study. In Series-I, just before the start of shearing, matric suction was decreased by increasing pore water pressure to start water infiltration; that is, shearing was performed simultaneously with water infiltration. In Series-II, the soil was first sheared with drained pore air and undrained pore water to pre-defined value of deviatoric stress. After that, matric suction was decreased by increasing pore water pressure to start water infiltration and shearing was performed by keeping deviatoric stress constant on the specimen. The test results showed that the decrease in matric suction has an effect on the volume of infiltrated water and degree of saturation. The triaxial test results indicated that the shear strength of unsaturated soil is higher if the soil is compacted on the dry side of optimum moisture content. Under such conditions, a higher reduction in suction is required to start the water infiltration. In addition to this, the triaxial test results also indicated that when the soil is under constant deviatoric stress, i.e., 80–90% of maximum deviatoric stress, the contribution of water infiltration toward soil failure is quite high.
Shearing Infiltration Tests to Study Mechanical Behavior and Failure Mechanism of Shallow Slopes
https://orcid.org/http://orcid.org/0000-0003-4187-2609
An experimental series of shearing infiltration triaxial tests were performed on compacted unsaturated soil to simulate the behavior of shallow slope failures. Soil samples were compacted at moisture contents from dry to wet optimum moisture content with the degree of saturation varying from 24.0 to 59.5% while maintaining the degree of compaction at 80%. Two series of shearing infiltration triaxial tests were performed in this study. In Series-I, just before the start of shearing, matric suction was decreased by increasing pore water pressure to start water infiltration; that is, shearing was performed simultaneously with water infiltration. In Series-II, the soil was first sheared with drained pore air and undrained pore water to pre-defined value of deviatoric stress. After that, matric suction was decreased by increasing pore water pressure to start water infiltration and shearing was performed by keeping deviatoric stress constant on the specimen. The test results showed that the decrease in matric suction has an effect on the volume of infiltrated water and degree of saturation. The triaxial test results indicated that the shear strength of unsaturated soil is higher if the soil is compacted on the dry side of optimum moisture content. Under such conditions, a higher reduction in suction is required to start the water infiltration. In addition to this, the triaxial test results also indicated that when the soil is under constant deviatoric stress, i.e., 80–90% of maximum deviatoric stress, the contribution of water infiltration toward soil failure is quite high.
Shearing Infiltration Tests to Study Mechanical Behavior and Failure Mechanism of Shallow Slopes
Iran J Sci Technol Trans Civ Eng
Rasool, Ali Murtaza (author) / Kuwano, Jiro (author)
2021-06-01
10 pages
Article (Journal)
Electronic Resource
English
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