NON-REPEATED SUPPORT TECHNOLOGY OF GOB SIDE ENTRY RETAINING WITH ROOF CUTTING TO RELEASE PRESSURE

Abstract

Temporary support of the gob side entry is of great significance to the safety mining. Taking
 the 1206 transportation tunnel of Shuguang Coal Mine as the engineering background, firstly,
 the key technical parameters of roof cutting to release pressure were given, the bolt and cable
 support parameters before entry retaining and the large deformation constant resistance cable
 reinforcement support parameters of retained entry were determined. Secondly, according to the
 overlying strata collapse patterns and mechanical model of gob side entry, the calculation formula
 of temporary support resistance in the dynamic pressure bearing area was derived. Finally, on
 the basis of determining the temporary support parameters, ZLQ2826/22.5/38 type of nonrepeated
 support and transportation equipment of alternating pressure cycles was developed,
 the main technical parameters and structural characteristics were analyzed, and a new type of
 fast and efficient non-repeated temporary support technology in the dynamic pressure bearing
 area was proposed. Field practice shows that the support parameters are reasonable, the
 support equipment and bolt support system have a good cooperative support effect, and the roof
 subsidence and roof separation have been effectively controlled. In the subsequent use process,
 the structure of support devices should be further optimized to improve the support effect.