There are many problems of using the single hydraulic prop to strengthen support in transportation roadway of shallow fully-mechanized mining face,such as inconsistency between mining and supporting opera-tions,high labor intensity and hazard risks for workers,and difficulty in reducing the number of workers in ad-vance areas of mining face.Taking the 52305 working face of Yujialiang Coal Mine as the engineering back-ground,and using a combination of field measurement,numerical simulation and theoretical methods,the mining pressure in the transportation roadway with the reinforcement support of the single hydraulic prop in advance area was measured,and the stability of roadway in advance area under the reinforcement support conditions of single hydraulic prop and active reinforcement support with bolts(cables)are compared.Finally,theoretical calculations were conducted on the supporting parameters for the transportation roadway,and the adaptability and safety of on-site support were verified.The results show that the surrounding rock of the transportation roadway of the 52305 working face is categorized to be relatively stable and stable type.The bearing capacity of the anchor bolts(cables)is within 85％of the rated load,and the stress distribution on both sides is basically symmetrical under the reinforcement support condition of the single hydraulic prop.The convergence displacement and loosening zone of the surrounding rock are very small.The stability of the surrounding rock is good.In the section affected by the front abutment pressure,the single hydraulic prop mainly has a strengthening support effect on local rock layers within 0.6 m thick of the roof,which is much smaller than the strengthening zone of anchor and cable sup-port.Cancelling the single hydraulic props,the surrounding rock along the transportation roadway can still main-tain safety and stability.Field trial at the 52305 working face of Yujialiang Coal Mine verified the reliability of the research results.
国家科技期刊平台
NSTL
维普
万方数据
