Behavior of Weakly Cemented Rock with Different Moisture Contents under Various Tri-Axial Loading States

Liu, Honglin; Zhang, Dongsheng; Zhao, Hongchao; Chi, Mingbo; Yu, Wenxin

doi:10.3390/en12081563

Cited by 17 publications

(6 citation statements)

References 13 publications

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“…The possibility of forecasting the UCS of weakly cemented rocks using their unit weight, P-wave velocity, tensile strength, and elastic modulus was investigated by Wang et al [32]. Liu et al performed systematic triaxial compression testing on three typical rock samples from the Ili mining area (mudstone, sandstone, and sandy mudstone) [33]. At the Buertai Coal Mine, Liu et al collected sandstone from depths of 101.5, 203.2, 317.3, 406.9, 509.9, and 589.8 m. During uniaxial compression experiments, the characteristic strength, acoustic emission (AE), and assessed energy evolution of sandstone were investigated [34].…”

Section: Introductionmentioning

confidence: 99%

Study of the Influence of Clay Minerals on the Mechanical and Percolation Properties of Weakly Cemented Rocks

Guo

Yang

et al. 2022

Geofluids

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The weakly cemented rock layer is easily damaged under the combined effect of seepage and mining disturbance and creates massive engineering disasters. This paper uses the self-designed weakly cemented remodeling mechanism to prepare weakly cemented rock samples with clay minerals accounting for 20%, 30%, 40%, 50%, and 60% of the total. The MTS816 system, in conjunction with an acoustic emission system and a high-speed camera, completed mechanical and seepage tests on the sample. The results show that when the quantity of clay minerals increases, the uniaxial compressive strength, elastic modulus, and rapid crack propagation stress of the weakly cemented rock samples decrease. Initial stress of crack development increases and then decreases, as well as the sample’s failure mode changes from shear to tensile. The sample’s permeability increases with increasing osmotic and axial pressure differential but decreases with increasing confining pressure under the same amount of clay minerals. The sensitivity of permeability to changes in osmotic pressure differential, axial pressure, and confining pressure increases as the amount of clay minerals increases. The mechanical and seepage characteristics can show significant changes in clay minerals in 20% to 30%.

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Section: Introductionmentioning

confidence: 99%

Study of the Influence of Clay Minerals on the Mechanical and Percolation Properties of Weakly Cemented Rocks

Guo

Yang

et al. 2022

Geofluids

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“…The pores and fractures in weakly consolidated rock mass expand, leading to significant changes in the mechanical properties and permeability characteristics of rock mass [4][5][6]. After the changes in the rock permeability characteristics, the effect of seepage water leads to the deterioration of the macroscopic mechanical strength and microstructure of weakly consolidated rock [7][8][9]. Therefore, it is of great significance for the safe and efficient mining of coal resources in weakly consolidated strata to study the rock seepage mechanism during coal mining in weakly consolidated strata and deeply analyze the seepage characteristics and influencing factors of weakly consolidated rock mass under mining-induced stress.…”

Section: Introductionmentioning

confidence: 99%

Seepage Characteristics and Influencing Factors of Weakly Consolidated Rocks in Triaxial Compression Test under Mining-Induced Stress Path

et al. 2022

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The rock of weakly consolidated coal measure strata has the characteristics of low mechanical strength and strong water sensitivity. Under the stress and seepage disturbance caused by coal seam mining, the surrounding rock structure is prone to instability, which leads to mine safety accidents and water resources loss. In order to master the mechanical response and permeability evolution law of weakly consolidated rock under the disturbance of coal seam mining, the specimens of Jurassic mudstone, sandy mudstone, and sandstone in the Ili mining area of China were collected, and a triaxial compression seepage test was carried out. A comprehensive analysis was carried out on the mineral composition and microstructure characteristics of the rock. The results show the following: (1) Compared to the constant confining pressure condition, mining-induced stress promotes the fracture development rate of weakly consolidated rocks. The ratios of strain at the yield point of mudstone, sandy mudstone, and sandstone under mining-induced stress and constant confining pressure are 0.33, 0.43, and 0.79, respectively, and the ratios of strain at the failure point were 0.48, 0.52, and 0.72, respectively. (2) Under the condition of mining-induced stress, the permeability change range and the permeability recovery rate of the three types of rocks were different, which decreased in the order of mudstone, sandy mudstone, and sandstone. (3) In the process of the triaxial compression test, there was a strong hysteresis in the permeability change of the mudstone, and the permeability and hysteresis of the three types of rocks decreased with the increase in the clay mineral content. (4) Combined with the analysis of the rock mineral composition and microstructure characteristics, it is believed that the clay minerals in the rock after water mud and swelling are the main reasons for the hysteresis of the permeability change of weakly consolidated rock, and the content of clay minerals is the main factor affecting the permeability characteristics of the weakly consolidated rock.

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“…Water shortages are a significant problem for coal mines in arid and semi-arid deserts or the Gobi region since preparing high-water cementing material as the support's filler requires a large amount of water [21][22][23]. The massive consumption of water aggravated the water shortage that prevailed during this process.…”

Section: Introductionmentioning

confidence: 99%

Behavior of CFRP-Confined Sand-Based Material Columns under Axial Compression

Liu

Deng

et al. 2021

Polymers

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This paper presents an innovative pumpable standing support designed for underground mines located in the arid and semi-arid deserts of the Gobi region with a shortage of water resources. The exterior shell of this pumpable standing support is made of carbon fiber-reinforced polymer (CFRP), while the infill material is a sand-based material (SBM). As the novel backfill material, SBM is the combination of high-water cementing material and desert sand. A series of experimental tests were conducted to obtain the mechanical response mechanism of this novel pumpable standing support under uniaxial compression. Test variables investigated in this research covered the water-to-powder ratio of the cementing material, the mixing amount of sand, and the thickness of the CFRP tube. Test results confirmed that the CFRP-confined SBM columns exhibited typical strain hardening behavior with the acceptable axial deformation. It was also demonstrated that using high-strength cementing material, a thicker CFRP tube, and a high mixing amount of sand effectively increased the bearing capacity of the CFRP-confined SBM column. Except for the exemplary structural behavior, the consumption of high-water cementing materials of the novel pumpable standing support is smaller than that of its counterparts made of pure cementing material, when specimens with the same mechanical performance are compared.

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Behavior of Weakly Cemented Rock with Different Moisture Contents under Various Tri-Axial Loading States

Cited by 17 publications

References 13 publications

Study of the Influence of Clay Minerals on the Mechanical and Percolation Properties of Weakly Cemented Rocks

Study of the Influence of Clay Minerals on the Mechanical and Percolation Properties of Weakly Cemented Rocks

Seepage Characteristics and Influencing Factors of Weakly Consolidated Rocks in Triaxial Compression Test under Mining-Induced Stress Path

Behavior of CFRP-Confined Sand-Based Material Columns under Axial Compression

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