超高巷道巷帮变形特征及支护技术

通过以山西某矿回采巷道掘进过程中出现的巷道超高段为工程背景,采用数值分析的手段演算了巷道高3～9 m时两帮位移特征:巷高越高巷帮中点水平位移和下沉越明显,大于某临界高度后位移会明显增加且巷帮有产生整体滑移的趋势。揭示了巷帮是超高巷道围岩控制的关键部位,采用锚杆索加固浅部围岩形成的锚固结构对围岩具有约束作用,并采用了相应的"三高"锚杆支护技术。

Roadside Deformation Features and Support Technology of Ultra-high Roadway

In the engineering background of the ultra-high roadway appeared in the process of mining roadway driving in a mine of Shanxi,it used the method of numerical analysis to calculate the displacement characteristics of two sides with the roadway height of 3 ～ 9m.The horizontal displacement and sinking of roadside midpoint became more obvious with the height of roadway increasing,when it was greater than a certain critical height,the displacement would significantly increase and there was a trend of overall slip.It revealed that the roadsides were the key parts of surrounding rock control in ultra-high roadway,anchor structure formed by using bolt to reinforce shallow surrounding rock had a binding effect on the surrounding rock,and it used the corresponding support technology of " three high" bolt.