Abstract
It is a complex issue to select the support structure parameters for a deep-buried roadway with fractured surrounding rock; especially when the support structure parameters need to be adjusted, the influence degree of support structure parameters on roadway deformation needs to be determined. The deformation of deep-buried roadway’s fractured surrounding rock development was investigated using multi-index orthoplan in this paper. According to the coal mine field investigation, support structure’s failure often occurs, and some need to be repaired many times. Through the roadway surrounding rock drilling, it was found that the stress of the surrounding rock was relieved, resulting in the cavity and separation of the stratum layer. The two sidewalls’ development and roof fractures are mainly tangential, and the original rock state appears only beyond 6.3∼8.2 m. The length of bolts, the row distance between bolts, the length of cables, and the row distance of U-shaped steel were selected as control factors in the multi-index orthogonal design, and roadway’s deformation values were taken as the test indexes. According to the orthoplan, nine numerical simulation schemes were designed, and FLAC3D was used for establishment. The range analysis method was used to analyze the test results. The results show that the control factors’ influence order on the total deformation of the roadway is as follows: row spacing between U-shaped steel > bolt length > cable length > row spacing between bolts, the influence order on the deformation of the roadway floor is as follows: row spacing between U-shaped steel > row spacing between bolts > bolt length > cable length, same as the left sidewall and right sidewall, and the influence order on the roadway roof’s deformation is as follows: row spacing between U-shaped steel > bolt length = cable length > row spacing between bolts, which provide a reference for the support design of deep-buried roadways with fractured surrounding rock, especially the adjustment of the supporting structure.
Highlights
With the shallow resource mined out, the coal mining gradually shifts to the deep. e factors such as significant buried depth, high-stress environment, complex structure, broken surrounding rock, and aquifer influence are superimposed, bringing about more challenges to the maintenance of coal mine roadway [1]. e deep-buried soft rock roadway’s maintenance difficulty gradually becomes the bottleneck of building high-efficiency mines
(1) If the damage depth of the goaf exceeds the location of the roadway, that is, the roadway is arranged in the crack zone or collapse zone, the surrounding rock of the roadway will lose stability as a whole, and the roadway will be in a large deformed and broken environment for a long time. e existing common coal mine support technology cannot control its long-term deformation and destruction. erefore, if the roadway is in the goaf’s damage range, the roadway location should be changed, and the roadway should be rearranged, and the roadway deformation problem should not be solved from the perspective of support
Structural element liner in FLAC3D is used to simulate reinforced wire mesh and shotcrete, and the calculation parameters are shown in Table 4 [22]. e bolts and cables are simulated by structural element cable, and the calculation parameters are shown in Table 5 [22,23,24]
Summary
With the shallow resource mined out, the coal mining gradually shifts to the deep. e factors such as significant buried depth, high-stress environment, complex structure, broken surrounding rock, and aquifer influence are superimposed, bringing about more challenges to the maintenance of coal mine roadway [1]. e deep-buried soft rock roadway’s maintenance difficulty gradually becomes the bottleneck of building high-efficiency mines. E factors such as significant buried depth, high-stress environment, complex structure, broken surrounding rock, and aquifer influence are superimposed, bringing about more challenges to the maintenance of coal mine roadway [1]. Batugin et al [4] developed a combined support technology for adjacent roadways and analyzed for a rock bolt and anchor cable mechanism based on the external staggered split-level panel layout’s spatial structure. E orthogonal design is used to carry out multiple combinations of supporting structure parameters to determine the influence degree of supporting structure parameters on the supporting effect, which provides a reference for the support design of deep-buried roadway with fractured surrounding rock, especially the adjustment of supporting structure
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