Analysis on Roof Broken Location of Gateway Retained Along Goaf and Technology of Roof Support

In order to obtain the main roof broken form and condition of the gateway retained along goaf,taking the gateway retained along goaf of No. 1528 coal mi ning face in Gequan Mine as the study object,the theoretical analysis and site observation method was applied to establish the mechanics model reflecting the basic fea tures of the strata.The results showed that when the support resistances of the sidewalls in the gateway retained along goaf were different,the main roof broken location would be different and the immediate roof cut at the gateway sidewall or the main roof directly cut could reduce the roof movement affected to the gateway.The enginee ring monitoring and measuring as well as the data analysis could understand when the gateway retained along goaf was affected by the mining influences,the rational b olt-steel mesh support measures could be applied to form stable structures,provide sufficient roof cutting resistance and effectively control the rational suspended lengt h of the roof.