木棚支护条件下的旧巷道断面刷大工艺优化及锚固支护参数的确定

Optimization of Cross-section Enlargement Technique and Determination of Bolted Supporting Parameters in Old Roadways with Wooden-shed Support

陕庄煤矿东回风大巷断面刷大工程为研究对象,采用FLAC3D数值模拟方法对原木棚支护条件下的巷道断面围岩应力分布、拆除木棚支护后的围岩应力重新分布、不同开挖步骤完成断面刷大后的围岩应力再分布特征、以及不同支护顺序进行比较研究。分析了刷大工程中顶板及两帮变形破坏特征,确立了先开挖顶板、后挖两帮的分步开挖方法及开挖过程中采取的分步支护措施等工艺优化方案。

On the basis of the cross-section enlargement construction of coal tunnels in Shanzhuang mine,Xihe Coal Co.,Shanxi Coal Transportation and Sales Group,the FLAC3D numerical simulation was used to compare the surrounding rocks stress distribution in the different conditions as follows: with the original wooden-shed support,after the removal of wooden-shed support,after the cross-section enlargement,and with the different supporting sequence.The deformation damage features of roof and two sides in the construction were analyzed,and then the technique optimization plan was established,including roof excavation first and then two sides step-by-step excavation and step-by-step supporting used in excavation.