摘要
开采深度的增加引起巷道围岩松动圈厚度增大,浅埋深巷道锚杆的支护参数已经不能适应深部巷道的支护要求。以河南首山矿为例,通过分析300,600 m埋深巷道围岩松动圈厚度,在充分考虑采动支承压力的影响和围岩变形破坏特征的条件下,优化得出了"加长锚杆+关键部位加密锚杆"的支护方案,并运用理论分析、数值模拟的方法,研究了原方案和优化后方案的围岩应力及位移分布差异。现场应用表明:优化后的锚杆参数明显改善了支护效果,巷道顶底板移近量为63 mm,两帮收敛量为67 mm,为深部巷道锚杆支护参数的优化提供了技术支持。
Thickness of surrounding rock loose circle is rising with the development of mining depth, and bolt supporting parameters of shallow depth is not adapt to the supporting demand of deep roadway. Taking Shoushan Coal Mine of Henan Province as an example ,ac cording to the observed thickness of surrounding rock loose circle of 300 m and 600 m depth roadway,and taking the abutment pressure and the deformation failure character of surrounding rock into account,a supporting scheme of ＂ increasing the length of bolt ＋ increas ing the number of bolt on key position of surrounding rock＂ was proposed in this paper. Theoretical analysis and numerical simulation were also used to study the difference of distribution of surrounding rock stress and displacement between original supporting scheme and optimized supporting scheme. Field application shows that the supporting effect improves much after optimizing the bolt supporting parameters,and roadway convergence between roof and floor is 63 mm, convergence between two sides is 67 mm, and the results can provide technical support for the optimization of bolt supporting parameters of deep roadway.
出处
《中州煤炭》
2013年第12期48-51,116,共5页
Zhongzhou Coal
关键词
深部巷道
松动圈
锚杆支护参数
围岩变形
数值模拟
deep roadway
loose circle
bolt supporting parameters
surrounding rock deformation
numerical simulation
