Quick Triaxial Consolidated Drained Test on Gravelly Soil

Chen, Zhibo; Zhu, Jun-Gao; Wen-bin, Jian

doi:10.1520/gtj20140213

Cited by 6 publications

(1 citation statement)

References 9 publications

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“…17,25 To further investigate the size distribution of seepage pores in tectonic coal and its relationship with stress, this study subjected the reconstituted tectonic coal samples to the compressed exhaust and pressure-transient permeability tests. Inspired by the consolidated drained test in soil mechanics, 32,33 we used the compressed exhaust test to estimate the variation of the seepage pore volume with stress. In the consolidation drainage test, water is approximately regarded as an incompressible fluid, and the change of porosity is emphasized.…”

Section: Introductionmentioning

confidence: 99%

Stress Sensitivity Analysis of Seepage Pores in Coal Briquettes Based on Compressed Exhaust and Pressure-Transient Tests

et al. 2023

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Seepage pores are the main space for methane transport in the coal seam. To further investigate variation laws of seepage pores with stress, this study established a new method based on the compressed exhaust and pressure-transient tests to characterize the seepage pore size distribution under different effective stress conditions. The reconstituted coal briquette and nonabsorbent helium were adopted as the experimental samples. The results showed that the deformation of coal mass mainly originates from seepage pores. With the increase of confining stress, the volume reduction of seepage pores presents a logarithmic growth. The initial seepage porosity of the tectonic coal specimen, i.e., the seepage porosity when effective stress is zero, was estimated to be 5.28%, accounting for 36.24% of the total porosity obtained by helium saturation. When effective stress is in the range of 13–48 MPa, the size of seepage pores generally ranges from 0.1 to 1.0 μm. The volume of seepage pores with sizes ranging from 0.1 to 0.5 μm always accounts for more than 80% of the volume of total seepage pores, and this proportion is not affected by effective stress. The inverse proportional coefficient between the threshold pressure gradient of helium and seepage pore diameter was finally determined to be 0.55 ± 0.19 mPa.

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Section: Introductionmentioning

confidence: 99%

Stress Sensitivity Analysis of Seepage Pores in Coal Briquettes Based on Compressed Exhaust and Pressure-Transient Tests

et al. 2023

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Modeling of Drain Consolidation in the Quick Triaxial Test and Its Analytical Solution

Chen,

Zhu,

Zheng

et al. 2024

Num Anal Meth Geomechanics

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Sand columns have been widely used to accelerate drainage and then improving the mechanical properties of soft soil foundations. The sand column has also been introduced into the triaxial test by researchers, in the center of the cylindrical specimen, to greatly accelerate drainage and consolidation process. The objective of this paper is to evaluate the consolidation properties of the triaxial cylindrical specimen considering the presence of a sand column, and then to propose a consolidation model that simulates the consolidation process of the triaxial test. The consolidation equations were derived considering the drainage of the specimen with a sand column composed of both vertical and double‐radial flows. Then the analytical solution of the model was obtained based on specific initial and boundary conditions. The comparison between the consolidation model and the laboratory tests yielded highly consistent. The case study demonstrated that the proposed consolidation model accurately simulates the evolution of average pore pressure and degree of consolidation in triaxial specimens containing a sand column. The studies on the consolidation parameters showed that there were different effects on the drainage rate for the diameter of specimen, the permeability coefficients of specimen and sand column, as well as the radius of the sand column.

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Strength and deformation behavior of the Yellow River silt under triaxial drained condition considering characteristic states

et al. 2023

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Quick Triaxial Consolidated Drained Test on Gravelly Soil

Cited by 6 publications

References 9 publications

Stress Sensitivity Analysis of Seepage Pores in Coal Briquettes Based on Compressed Exhaust and Pressure-Transient Tests

Stress Sensitivity Analysis of Seepage Pores in Coal Briquettes Based on Compressed Exhaust and Pressure-Transient Tests

Modeling of Drain Consolidation in the Quick Triaxial Test and Its Analytical Solution

Strength and deformation behavior of the Yellow River silt under triaxial drained condition considering characteristic states

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