A Study of the Deformation Law of the Surrounding Rock of a Laminated Roadway Based on FLAC3D Secondary Development

Abstract

To investigate and analyze the influence of different stress environments on the deformation and destabilization of the rocks surrounding laminated roadways under high stress, this study conducted numerical simulations of coal–rock combination under different circumferential pressures and of the surrounding rocks of highly stressed laminated roadways under different lateral pressure coefficients. In addition, a new custom constitutive structure model was constructed based on the Mohr–Coulomb criterion and realized in FLAC3D software by combining field working conditions. The model was then developed in FLAC3D software for a second time. The results show that the calculated results of the model in this study are in good agreement with the experimental results and the errors are small, while the calculated results of the Mohr–Coulomb model differ from the experimental values under two types of surrounding rock pressure. The deformation of the Mohr–Coulomb model is significantly smaller than that of the customized model, which verifies the reasonableness and superiority of the self-built model in combination with the field conditions. This provides theoretical and practical bases for the design and optimization of stratigraphic roadway support in underground coal mines.

Simulation Experimental Investigations into the Mechanical Response and Failure Mechanisms of Coal–Rock Combinations

“…According to the national standard GB/T23561.7-2009 for the determination of the physical and mechanical properties of coal and rock, the CRC sample in this paper was machined into φ50 × 100 mm cylinders [61]. If the dimensions of the simulation need to be further in-depth and consistent with actual case dimensions, it may be difficult to use the PFC 4.0 simulation software to achieve a current PFC software simulation of standard specimens' microscopic fracture behaviour; this, alongside the damage mechanism, is very good, differing from that of FLAC3D 7.0 simulation software [44,46,62]. Zhang et al [63] simulated a simplified rockcoal-rock specimen, and the results obtained were approximately the same as the field 2 damage pattern; it can thus be considered that the fracture behaviour and the damage mechanism of the simulated combined specimen can be obtained from field references.…”

Analysis of stability in pedestrian downhill roadway at Yindonggou 11th coal mine area: the impact of anchor cable support density

“…This software possesses a robust capability to address intricate mechanical problems and finds extensive application in simulating large deformations and designing support systems within geotechnical and mining engineering (Zhao et al, 2012;Shi et al, 2019;Wang et al, 2023;Zheng et al, 2024). Notably, its usage facilitates the establishment of roadway and support structure models while enjoying industry-wide recognition for the reliability of its simulation results (Zhao et al, 2012;Shi et al, 2019;Gao et al, 2023;Wang et al, 2023). Given that the advantages of FLAC 3D align closely with the objectives of this study, it was sfelected as the preferred software.…”