Deformation and Control of Surrounding Rock in Deep Well and Soft Bottom Goaf Retaining Roadway
In order to solve the problem of severe deformation of deep well soft bottom goaf tunnels in high-stress environments,taking the 43209 working face of Duerping Mine as an example,this paper proposed a support scheme of"advanced weakening drilling + high-strength anchor injection of the roof + reverse bottom arch pressure filling + floor grouting + flexible mold filling body beside the roadway"based on the deformation characteristics of the surrounding rock.By constructing advanced weakening drilling in the working face,combined with grouting and floor filling pressure materials,flexible support was achieved.The on-site test results show that after adopting the optimized support scheme,the displacement of the roof is reduced from 327 mm to 108 mm,the displacement of the floor is reduced from 614 mm to 149 mm,and the displacement of the buttock is reduced from 294 mm to 62 mm.The convergence rate of the roadway is significantly reduced,achieving good results.
deep well and soft bottomgob-side entry retainingsurrounding rock deformationadvanced weakening hole cutting topflexible support
NETL
NSTL
万方数据
维普
