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 FLAC^3D 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.

中文翻译：

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深埋巷道裂隙围岩变形控制因素影响程度的正交设计分析

裂缝性围岩深埋巷道支护结构参数选择是一个复杂的问题；特别是在需要调整支护结构参数时，需要确定支护结构参数对巷道变形的影响程度。本文采用多指数正射法研究深埋巷道裂隙围岩发育变形。根据煤矿现场调查，支护结构经常发生故障，有的需要多次修复。通过巷道围岩钻孔，发现围岩应力得到释放，导致地层空洞分离。两个侧壁的发育和顶板裂缝主要是切向的，而原始岩石状态仅出现在 6.3∼8.2 m 以外。多指标正交设计选取螺栓长度、螺栓间距、缆索长度、U型钢排距作为控制因素，以巷道变形值作为试验指标。根据orthoplan设计了9个数值模拟方案，FLAC^3D被用于建立。采用极差分析法对试验结果进行分析。结果表明，控制因素对巷道总变形的影响顺序为：U型钢排距>螺栓长度>拉索长度>螺栓排距，对巷道底板变形的影响顺序为为：U型钢排距>螺栓排距>螺栓长度>索长，与左右侧壁相同，对巷道顶板变形的影响顺序为：U-排距型钢>锚杆长度=拉索长度>锚杆排距，为围岩破裂的深埋巷道支护设计提供参考。