3D Physical Experimental Study of Shield-Strata Interaction Under Dynamic and Static Disturbance

Article Mining & Mineral Processing

Experimental study on the mechanical properties and consolidation mechanism of microbial grouted backfill

Xuejie Deng et al.

Summary: This paper proposes microbial grouted backfill (MGB) as a potential solution to reduce the environmental impact of backfill mining. The effects of cementation solution concentration, volume ratio of bacterial solution to cementation solution, particle sizes of the aggregates, and the number of grouting batches on the mechanical properties of MGB are studied. The experimental results show that the strength of MGB increases with the increase in cementation solution concentration and the decrease in volume ratio of bacterial solution to cementation solution, with the peak strength achieved at a concentration of 2 mol/L and a volume ratio of 1:9. Graded MGB samples with particle sizes of 0.2 to 0.8 mm exhibit the highest strength.

INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY (2022)

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Article Acoustics

3D Physical Modelling Study of Shield-Strata Interaction under Roof Dynamic Loading Condition

Shengli Yang et al.

Summary: This study investigates the interaction between the roof strata and the longwall shield under dynamic impact load conditions through a 3D physical modeling platform. Findings reveal that the level of face and roof failures are influenced by the magnitude of the dynamic impact load, and the position and height of the roof fall play a crucial role in the stability of the roof and face.

SHOCK AND VIBRATION (2021)

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Article Energy & Fuels

Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression

Yulong Chen et al.

Summary: This study focuses on the mechanical behavior of coal-rock bimaterial composite structures under triaxial compression, finding that the mechanical parameters of rock-coal-rock composites are superior to other combinations. After compression failure, the primary fracture of coal-rock composite bodies occurs within the coal, and increasing confining pressure can reduce burst proneness.

INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY (2021)

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Article Energy & Fuels

Studying the performance of fully encapsulated rock bolts with modified structural elements

Jianhang Chen et al.

Summary: In this study, a two-stage shear coupling model was used to simulate the bonding performance of the interface between rock bolts and grout material. The modified cableSELs in FLAC3D showed that the load transfer capacity of rock bolts increased significantly with the diameter of the bolt. The performance of the rock bolting system was observed to change from ductile behavior to brittle behavior as the bolt diameter increased.

INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY (2021)

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Article Construction & Building Technology