Mechanical characteristics analysis of combined bearing structure of"coal-supporting body"in gob-side entry retaining of thick coal seam
Aiming at the problems of surrounding rock control in gob-side entry retaining of thick coal seam,taking Wangzhuang Coal Mine as the engineering background,through research methods theoretical analysis and numerical simulation,the instability mechanism of the supporting body beside the gob-side entry retaining of thick coal seam was expounded,and the surrounding rock control strategy of"improving the stress environment of surrounding rock of the retaining roadway by roof cutting pressure relief+adjusting the height of the supporting body beside the roadway to coordinate the pressure-yielding capacity of the combined bearing structure"was proposed.Research has shown that in the combination bearing structure of"coal-supporting body",as the proportion of supporting body decrea-ses,the compressive strength of the combination body shows a trend of"rapid descent,gradual descent,and rapid descent",and the peak strain shows a trend of"stable-linear increase-stable".Combined with the numerical simulation results of Wangzhuang Coal Mine,it can be concluded that when the ratio of supporting body is 80％,the combined bearing structure of"coal-supporting body"has both good bearing capacity and pressure relief capacity,which avoids the roof cutting subsidence along the main roof of the gob-side entry re-taining and optimates the stress environment of the surrounding rock of the retaining roadway.The research results can provide theoreti-cal reference for gob-side entry retaining technology of thick coal seam.
thick coal seamgob-side entry retainingroadway side supporting bodynumerical simulation
万方数据
