Work

Synergistic bearing and instability evolution mechanisms of roof-pillar systems in multi-level goaf groups

Year: 2025

Type: article

Abstract: The synergistic bearing effect and stability of roof-pillar systems in goaf directly influence the sustainability of multi-level mining. For a multi-level goaf system, a synergistic bearing mechanical model of the roof-pillar was established. The mechanism of the roof-pillar synergistic bearing was analyzed by the deformation and mechanical behavior. The synergistic bearing effect of pillars is negative with roof thickness-to-span ratio f and positive with pillar width-to-height ratio η , and the roof exhibits the opposite behavior. In addition, the instability characteristics and mutual interactions within the goaf groups system were revealed. When f < 0.4, η > 0.51, the safety factor of pillar Ⅲ-1 is the smallest, and the stability state of the roof-pillar systems is mainly affected by the roof, which may lead to large-scale instability disasters. When f > 0.4, η < 0.51, the safety factor of pillar Ⅰ-1 is the smallest, and the stability state of the roof-pillar systems is mainly affected by the pillar, there may be large deformation or local instability of the roof. Meanwhile, the failure evolution characteristics of the roof-pillar under overburden load and rock elastic modulus were analyzed, the influence of overburden load was greater than that of elastic modulus. This study can provide a certain reference significance for safe mining in mines.

Source: Alexandria Engineering Journal

DOI: 10.1016/j.aej.2025.07.047

Authors: Jinzhu Li, Yu Xiong, Lichun Jiang

Institution: South China University of Technology

Language: English

Topic: Geomechanics and Mining Engineering

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $1,900