Research on the influence mechanism of multiple mining of extremely thick coal seams on the damage of overburden and the load - bearing structure
Year: 2026
Type: article
Abstract: The stability of overburden structure during slicing mining is critical for extra-thick coal seam extraction. Taking the Zhundong Mining Area as the background, this study integrates numerical simulation, theoretical analysis, and physical simulation to investigate the evolution of overburden structure, rock block size distribution, and force chain network characteristics. Results show that as slicing numbers increase, the near-field overburden transforms from discrete blocks into granular materials, following a structural evolution sequence of “masonry beam—short masonry beam—extrusion equilibrium arch.” Repeated mining causes degradation of the low-level bearing zone, with force chain strength progressively diminishing. Cumulative mining effects—including shortened rock blocks, increased transferred loads, and exacerbated internal damage—lead to instability of the bearing structure. Consequently, the loss of bearing capacity in the low-level key stratum forces the bearing structure to migrate upward, transforming from a “beam-type” to an “arch-type” system. Based on the concept of “enhancing bearing structure stability,” a full-life-cycle mine pressure control system for slicing mining of extra-thick coal seams is established.
Source: Environmental Earth Sciences
Authors: Hao Wang, Xingping Lai, Feng Cui, Chong Jia
Institution: Xi'an University of Science and Technology
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,290
Award: G175489678
OpenAlex ID: W7172299415