Abstract
ABSTRACTTunnel boring machine (TBM) has been increasingly used for excavating rock roadways in coal mines. However, the slower speed of support installation, compared to the cutterhead's fast rock‐breaking capability, limits the overall excavation speed of rock roadways. This study examines the construction of a gas drainage roadway in Shoushan No.1 coal mine using a double‐shield TBM. A mechanical model for TBM excavation was developed, considering the spatial effects of the excavation face. The study identified a zonal support mechanism for the surrounding rock in TBM excavation roadways, it also analyzed the effects of support reaction forces and virtual support forces on the surrounding rock of different zones. A zonal control technology for surrounding rock was proposed and successfully implemented in the field. The results indicate that the strain evolution of the surrounding rock behind the TBM excavation face displays distinct zonal features. Based on this, the study recommends timely support for critical areas of the roadway roof in rapidly deforming zones through localized active primary anchor bolting. In slower deforming zones, secondary active anchor bolting is recommended for the remaining parts of the roadway roof and the side supports. In stable zones, cables anchor bolting support are implemented. A phased control technology system for the zonal management of surrounding rock in TBM excavation roadway was developed, and optimal parameters were determined using numerical simulations. The phased and zonal control technology was successfully applied at Shoushan No. 1 coal mine, achieving a maximum excavation speed of 623 m per month. This study provides valuable insights into the application of rapid excavation technology by TBM under similar conditions.
Published Version
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