Preprint Article Version 1 This version is not peer-reviewed

Shearing with Infiltration Tests to Study Mechanical Behavior and Failure Mechanism of Shallow Slopes

Version 1 : Received: 20 October 2019 / Approved: 21 October 2019 / Online: 21 October 2019 (15:22:29 CEST)

How to cite: Rasool, A.M.; Kuwano, J. Shearing with Infiltration Tests to Study Mechanical Behavior and Failure Mechanism of Shallow Slopes. Preprints 2019, 2019100246 (doi: 10.20944/preprints201910.0246.v1). Rasool, A.M.; Kuwano, J. Shearing with Infiltration Tests to Study Mechanical Behavior and Failure Mechanism of Shallow Slopes. Preprints 2019, 2019100246 (doi: 10.20944/preprints201910.0246.v1).

Abstract

An experimental series of shearing tests with water infiltration 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 of 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 with infiltration 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 i.e. shearing is carried 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 which matric suction was decreased by increasing pore water pressure to start water infiltration and shearing is 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 soil slopes compacted on the dry side of optimum moisture content showed better performance than other soils, they require more decrease in matric suction to start water infiltration and showed higher deviatoric stress. In addition to this, water infiltration alone can cause the failure of shallow slopes without having to have any further loading.

Subject Areas

shallow slopes; unsaturated soil; slope stability; deviatoric stress; pore-water pressure; water infiltration

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