Predictive model for the instability of flexible formwork concrete wall in secondary mining of non-pillar coal mining.

ABSTRACT: The secondary mining movement in non-pillar coal extraction causes significant overrun damage to flexible formwork concrete walls, leading to extensive deformation of roadway roof and bottom plates. This adversely affects working face efficiency and safety. The engineering context focuses on the non-pillar gob-side retaining walls in the 1315 working face of Zhaozhuang Coal Mine and the 23107 working face of Xiegou Coal Mine. Through on-site investigation, numerical simulation, theoretical analysis, and testing, we explore the stress migration law and destabilizing mechanism of the flexible formwork concrete wall influenced by the secondary mining movement of the coal-free pillar along the hollow wall. The research results showed that: (1) During the mining back process, the concrete wall

SUBMITTER: Zhu Y 

PROVIDER: S-EPMC11408628 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature