Study on post-peak stress-seepage characteristics of limestone under triaxial cyclic loading and unloading conditions

Jiang, Tengfei; Jiang, Annan; Jiang, Hao; Zhang, Fengrui; Xu, Mengfei

doi:10.1007/s12517-022-09632-z

Cited by 4 publications

(2 citation statements)

References 35 publications

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“…Figure 7 shows that the overall change trend in the stress-strain curve for the specimen is roughly the same under the condition of different contents and different lengths of basalt fiber, and the stress-strain curve for the cement soil in the compression process can be similarly divided into five stages [43,[45][46][47]. (1) During the compaction stage, the cement soil specimen is subjected to an external load, and the fine particles are rearranged.…”

Section: The Influence Of Basalt Fiber Length and Content On The Stre...mentioning

confidence: 98%

Effect of Basalt Fiber Content and Length on the Strength and Crack Development of Polyvinyl Alcohol/Basalt Hybrid Fiber-Reinforced Cement Soil

Shu

Zhang

2023

Polymers

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Polyvinyl alcohol (PVA) fiber is widely used in geotechnical engineering because of its excellent physical and mechanical properties; however, PVA fibers are prone to aging, while basalt fiber has a natural anti-aging ability, which can be added to cement material to effectively eliminate the effects of aging on PVA fiber. Previous experiments identified that the optimum content of PVA fiber is 0.5% (mass fraction, the same below). Based on this, we continued to add basalt fibers of different lengths (3 mm, 6 mm, 9 mm, 12 mm, 18 mm, 30 mm) and different contents (0%, 0.25%, 0.5%, 0.75%, 1%) to study the effect of both length and content of basalt fibers on the strength of cement soil specimens. It was concluded that adding 0.5 % of 9mm basalt fiber results in the greatest increase in unconfined compressive strength (UCS). The UCS reached 12.59 MPa, which was 71% higher than specimens without fiber, and a regression analysis was carried out to obtain the relationship among them. The ratio of cement soil in the highest UCS and the relationship among the UCS, the length, and the content of basalt fiber can be used as a reference for practical projects. In addition, digital image correlation (DIC) technology was used to analyze the surface cracks and horizontal strain field when the peak strain was reached at each content and length of the basalt fiber. Finally, the curing mechanism for hybrid fiber cement soil was analyzed by combining the results of the UCS test, DIC test, and SEM test.

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Section: The Influence Of Basalt Fiber Length and Content On The Stre...mentioning

confidence: 98%

Effect of Basalt Fiber Content and Length on the Strength and Crack Development of Polyvinyl Alcohol/Basalt Hybrid Fiber-Reinforced Cement Soil

Shu

Zhang

2023

Polymers

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“…Later, they established a representative elementary volume-scale lattice Boltzmann model considering the slippage effect and gas absorption to study the effects of particle complexity and gas pressure on shale gas flow and permeability. Jiang et al used the rock mechanics test system to investigate the evolution of permeability of shale specimens with axial bedding and axial macro-fractures under cyclic axial and confining pressure. Zhang et al employed a self-development gas injection displacement gas tester.…”

Section: Introductionmentioning

confidence: 99%

Seepage Characteristics of Broken Carbonaceous Shale under Cyclic Loading and Unloading Conditions

Zhang,

Yuan,

Luo

et al. 2023

Energy Fuels

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This study conducted a seepage experiment of broken shale under cyclic loading and unloading conditions to investigate the permeability characteristics of broken shale with different particle sizes under stress disturbance. There were six groups of broken shale samples with different particle sizes, and three cycles of loading and unloading were conducted to test the permeability of broken shale. The influence of the number of cycles and shale particle size on permeability damage was analyzed. Furthermore, the stress-seepage model of broken shale was established to analyze the influence of the number of cycles and shale particle size on the variation of stress sensitivity of broken shale under different loading and unloading stages. The results show that the initial permeability, permeability damage, and stress sensitivity of broken shale are negatively correlated with the number of cycles and that the first cycle has a significant impact on them. As the size of the broken shale particles increases, the rate of change in shale permeability also increases before and after conducting experiments. This results in a greater shale damage permeability. However, the impact of the number of cycles on shale permeability damage decreases. Additionally, the shale's stress sensitivity becomes stronger. It is also found that the seepage characteristics between the small particle size (G1−G4, 0−6.8 mm) and the large particle size (G5−G6, 7−15 mm) are different in the broken shale samples with six different particle sizes. In addition, the change of the shale particle structure under cyclic loading and unloading conditions is discussed, and the mechanism of the shale permeability change is studied. This study indicates the seepage characteristics of broken shale under cyclic loading and unloading conditions, which has a certain guiding significance for the safe and efficient extraction of shale gas wells.

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Experimental study on seepage–corrosion coupling characteristics of a single fracture in limestone subjected to acid mine drainage

Liu,

Zuo,

2024

Geomechanics for Energy and the Environment

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Study on post-peak stress-seepage characteristics of limestone under triaxial cyclic loading and unloading conditions

Cited by 4 publications

References 35 publications

Effect of Basalt Fiber Content and Length on the Strength and Crack Development of Polyvinyl Alcohol/Basalt Hybrid Fiber-Reinforced Cement Soil

Effect of Basalt Fiber Content and Length on the Strength and Crack Development of Polyvinyl Alcohol/Basalt Hybrid Fiber-Reinforced Cement Soil

Seepage Characteristics of Broken Carbonaceous Shale under Cyclic Loading and Unloading Conditions

Experimental study on seepage–corrosion coupling characteristics of a single fracture in limestone subjected to acid mine drainage

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