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The Influence of Water Content on the Time-Dependent Mechanical Behavior of Argillaceous Siltstone
Abstract An accurate understanding of how water can affect the time-dependent deformation is important to assess the long-term stability of geotechnical projects. Triaxial compression rheological tests with different water contents were carried out to investigate the effects of water content and stress level on the creep strain, creep rate, long-term strength, and creep failure mode. Our experiments show that the time-dependent characteristics of rock are gradually activated with the increase of water content and stress level. The water content and stress level greatly increase the instantaneous strain, creep strain, and the steady creep strain rate, however, shorten the time to dilatancy and the time to failure. The creep curves and the creep rate versus time curves of argillaceous siltstone in the accelerated creep stage show a trend of “brittle-to-ductile” transformation. A modified steady-state creep rate tangent method was proposed and the analysis proves that the long-term strength of the rock decreases continuously with increasing water content. With the increase of water content, the rock exhibits a regularization of the main fracture surface, a gradual decrease of the number of secondary cracks, and a gradual disappearance of the shear slip phenomenon as observed. Our explanation is that since the clay minerals of $ T_{3} $sn argillaceous siltstone are mainly kaolinite, the main softening mechanism of the rock at low water content (0 ~ 1.14%) is the lubricating effect of the bound water film. The softening mechanism of clay-rich siltstone at high water content (1.14–3.35%) is dominated by the hydraulic fracturing action of pore water and Rehbinder effect.
Highlights The triaxial compression creep properties of argillaceous siltstone with different water contents are exposed.A modified steady-state creep rate tangent method for the determination of the long-term strength of soft rocks such as argillaceous siltstone is proposed.The softening mechanism of clay-rich siltstone with different water contents is analyzed and revealed.
The Influence of Water Content on the Time-Dependent Mechanical Behavior of Argillaceous Siltstone
Abstract An accurate understanding of how water can affect the time-dependent deformation is important to assess the long-term stability of geotechnical projects. Triaxial compression rheological tests with different water contents were carried out to investigate the effects of water content and stress level on the creep strain, creep rate, long-term strength, and creep failure mode. Our experiments show that the time-dependent characteristics of rock are gradually activated with the increase of water content and stress level. The water content and stress level greatly increase the instantaneous strain, creep strain, and the steady creep strain rate, however, shorten the time to dilatancy and the time to failure. The creep curves and the creep rate versus time curves of argillaceous siltstone in the accelerated creep stage show a trend of “brittle-to-ductile” transformation. A modified steady-state creep rate tangent method was proposed and the analysis proves that the long-term strength of the rock decreases continuously with increasing water content. With the increase of water content, the rock exhibits a regularization of the main fracture surface, a gradual decrease of the number of secondary cracks, and a gradual disappearance of the shear slip phenomenon as observed. Our explanation is that since the clay minerals of $ T_{3} $sn argillaceous siltstone are mainly kaolinite, the main softening mechanism of the rock at low water content (0 ~ 1.14%) is the lubricating effect of the bound water film. The softening mechanism of clay-rich siltstone at high water content (1.14–3.35%) is dominated by the hydraulic fracturing action of pore water and Rehbinder effect.
Highlights The triaxial compression creep properties of argillaceous siltstone with different water contents are exposed.A modified steady-state creep rate tangent method for the determination of the long-term strength of soft rocks such as argillaceous siltstone is proposed.The softening mechanism of clay-rich siltstone with different water contents is analyzed and revealed.
The Influence of Water Content on the Time-Dependent Mechanical Behavior of Argillaceous Siltstone
Lin, Hanxiang (author) / Zhang, Qiangyong (author) / Zhang, Longyun (author) / Duan, Kang (author) / Xue, Tianen (author) / Fan, Qinghan (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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