Study on Construction Technology and Support Technology of Full Mechanized Mining Face Retracement Channel in High Stress Area
The retracement channel of 81511 working face in Hulonggou Mine is affected by geologi-cal structure during construction,and there are technical problems such as low efficiency,high cost and dif-ficult surrounding rock control and maintenance when using traditional construction technology.Through technical research,the construction scheme of 81511 working face retracement channel is compared,the construction technology of self-formed roadway method is adopted,and the combined support technology of"top cutting pressure relief+grouting reinforcement+anchor cable steel belt+anchor cable shed"is adopt-ed for the top of the retracement channel in high stress area,and the combined support technology of"L-shaped steel shed+hydraulic expansion anchor bolt"is adopted for the coal wall.The practical application results show that after adopting the self-formed roadway construction technology,the construction period of the retracement channel is shortened by 8.5 d and the number of equipment installation is reduced.After adopting the combined support technology,the roof breakage and the coal wall flaking phenomenon of the re-tracement channel in the high stress area are reduced.After the construction of the retracement channel,the field measured maximum displacement of the roof and floor is 0.24 m,and the maximum convergence of the side is 0.32 m.Remarkable application results have been achieved.