Comparison and selection of different gob-side entry retaining methods and the engineering application
The technology of gob-side entry retaining determines the mining efficiency and economic benefits of coal mines,and the reasonable method of gob-side entry retaining should be selected based on engineering geological conditions.Taking the 4303 working face of Shaqu Coal Mine as the engineering background,three types of entry retaining techniques were compared.Firstly,the displacement variational method was used to compare the roof subsidence of the three gob-side entry retaining methods.Secondly,FLAC3D numerical simulation software was used to establish calculation models for different gob-side entry retaining methods,and the lateral support stress of solid coal slope and surrounding rock deformation laws under the three retaining methods were analyzed.The results indicate that,the lateral support stress ranks as:retaining with solid backfilling exterior of roof cutting<retaining with cutting roof<retaining with solid backfilling;compared with retaining with solid backfilling,the roof subsidence and floor heave of retaining with cutting roof decreases by 14.3%and 16%,respectively,and the roof subsidence and floor heave of retaining with solid backfilling exterior of roof cutting decreases by 23.8%and 12%,respectively;the cost of entry retaining ranks as:entry retaining with solid backfilling is similar to retaining with roof cutting,and the cost of retaining with solid backfilling exterior of roof cutting is the highest.Finally,based on the above research,the gob-side entry retaining with roof cutting was applied and favorable application effect was achieved.
roof cutting and pressure releasinggob-side entry retainingfilling with flexible formworkengineering application
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