## 7 Conclusions  
In this study, the deformation and damage characteristics of the rock surrounding the roadway caused by the original support scheme's high stress concentration area (HSCA) were examined, and a high-preload HSCTS support technology was innovatively suggested. The distribution properties of the roadway's high stress concentration area and the distribution law of the truss anchor cable pre-stress are determined using numerical simulation, and the control mechanism is investigated through mechanical analysis. The key findings are as follows: after simulating the impact of the new support scheme, determining its exact parameters, and field-verifying it, the new support scheme uses HSCTS as its core.  
1. The damaged types of the supporting structures and the deformation characteristics are concluded as follows: a. Six damaged supporting types are mainly obtained: broken bolt and cable, loose bolt and cable, tearing steel belt, and curved steel beam.  
2. Both the BSRS and the associated growth rate are generally large. c. Large deformations of surrounding roadways occur without the proper supporting scheme and have to face multiple repair activities during the roadway excavation period. d. The bolts and cables bearing loads have a large difference during the roadway excavation process, and the cables suffer from extreme high stresses, resulting in the combined bolt and cable supporting effect being weak and cables and bolts damaged in sequence.
3. Based on the difficult supporting roadway affected by the HSCA, the HSCTS support is put forward, and the main supporting effects and superiority are analyzed. Moreover, the supporting stress distribution characteristics were simulated, which showed the stress distribution field of the HSCTS is uniform and could benefit from forming a stable structure.
4. The supporting scheme with the core of the HSCTS and detailed parameters of the airway 1409 are determined and tested in the field; the findings indicate that the maximum value of shallow delamination is 44 mm, the maximum value of deep delamination is 54 mm, the top plate is not sinking more than 79 mm, and the two gangs are not moving in close proximity to one another more than 191 mm; and the monitoring results showed the surrounding rock deformation is much smaller than the former scheme with no repairing activities and testified to the significant supporting effect.  
The findings could help to understand the surrounding rock deformation characteristics of the excavated coal roadway distributed in areas with the LIMIS. Furthermore, the designed supporting scheme has successfully safeguarded the surrounding rock's stability. Furthermore, this supporting case could afford a general reference for the similar geological and production conditions; however, the detailed parameters should be determined with the field roadway with the special geological or production condition.  
Software, L.T.; Investigation, H.Y.; Data curation, Y.C.; Writing--original draft, Z.X.; Writing--review & editing, C.L. All authors have read and agreed to the published version of the manuscript.  
The datasets used and/or analyzed during the current study available from the corresponding author on reasonable request.  
The authors declare no conflict of interest.