综放面沿空掘巷锚网索联合支护参数优化

Optimization of the joint support parameters of the anchor line in the hollow excavation

针对金庄煤矿5202综放面回风巷沿空掘巷变形严重的问题,根据理论计算确定了支护参数,并采用FLAC^(3D)数值模型分析巷道在"不布置卸压巷道+原设计支护"和"布置卸压巷+现设计支护"下两种方案围岩应力变化及巷道围岩变形。分析表明,将锚杆长度由2.6 m增长到2.8 m,实体帮玻璃锚杆换成螺纹钢锚杆,锚索长度由8.3 m变为7.5 m,增设卸压巷道后沿空巷道的变形量得到有效控制。

For Jin Zhuang roadway driving along goal coal mine 5202 fully-mechanized face return air lane deformation serious problems, according to the theoretical calculation determines the support parameters, and USES the FLAC3D numerical model for analysis of roadway in ＂not arrange unloading ＋ the original design of roadway support＂ and ＂decorate unloading lane ＋ design support now＂ under two kinds of schemes of surrounding rock stress and deformation of surrounding rock of roadway. Analysis shows that the anchor length increases from 2.6 m to 2.8 m, entity for glass for rebar anchor holt, anchor cable length from 8.3 m to 7.5 m, add after pressure relief roadways along goaf roadway deformation under control.