Analysis of Influencing Factors and Prevention of Coal Wall Deformation and Failure of Coal Wall in Caving Face with Large Mining Height: Case Study

The coal walls in a caving face with tall mining height are prone to rib spalling, which leads the phased cessation of working face, causes heavy losses, and endangers safety underground workers. In order prevent serious spalling accidents fully mechanized faces large improve prediction ability control load-bearing mechanical model roof–coal wall–support system was established based on moment-balance relationship. expressions for deformation stress distribution wall were calculated. Then, influences key factors horizontal displacement investigated. A numerical simulation established, an orthogonal test design introduced. On this basis, four factors: cutting height, breaking position main roof, support strength, sidewall protecting force volume plastic zone wall, analyzed. Moreover, their importance ranked basis sensitivity. Based engineering conditions production practices Cuncaota II Coal Mine, parameters controlling measures preventing proposed guide practical actions.