Research on deformation characteristics of surrounding rock and support technology of deep cross-fault roadway
To address the problem of large deformation of the surrounding rock of the roadway cross-fault fracture zone,which is difficult to support,taking the south wing of Jiaojiazhai Coal Mine returning roadway crossing fault fracture zone as the background of the pro-ject,according to the geological conditions and numerical calculations on-site,the deformation characteristics and influencing factors of the surrounding rock in the fault fracture zone of the roadway were studied.A combined supporting scheme of"U-shaped steel+shot-crete+grouting+anchor mesh cable"was proposed,and on-site practice was carried out.The results showed that under the optimized supporting scheme,the amount of roof subsidence,floor heave and convergence of two gangs of the roadway were 138 mm,114 mm and 164 mm,respectively,and the deformation amount of the roadway was obviously reduced,and during the process of the roadway excava-tion,there was no phenomenon such as roofing and rib spalling,and ensured the safety of the roadway excavation.
fault fracture zonedeformation characteristicsinfluencing factorscombined support
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