蠕变破坏影响下残采煤柱宽度数值研究
发布时间：2019-03-07 13:10
【摘要】：为确定掘进巷道过残采区域时煤柱的合理宽度,采用理论计算及数值模拟,对不同宽度残采煤柱稳定性、应力分布及其内部巷道受蠕变影响后的变形破坏特征进行了分析,研究表明:当煤柱宽度为15 m时,微破裂隙贯通煤柱,确定煤柱临界尺寸为15m;残采煤柱经过二次蠕变破坏,巷道位移曲线可分为Ⅰ蠕变递增区、Ⅱ蠕变衰减区、Ⅲ稳定蠕变区共三个阶段,相应的巷帮应力曲线类型可分为马鞍型、几字型和孤峰型。
[Abstract]:In order to determine the reasonable width of coal pillar in the over-residual mining area of tunneling roadway, the stability, stress distribution and deformation and failure characteristics of inner roadway affected by creep are analyzed by theoretical calculation and numerical simulation, and the stability and stress distribution of residual coal pillar with different width are analyzed by means of theoretical calculation and numerical simulation. The results show that when the width of the pillar is 15m, the critical size of the pillar is 15m. After secondary creep failure, the displacement curve of the roadway can be divided into three stages, I creep increasing zone, 鈪，
本文编号：2436155
[Abstract]:In order to determine the reasonable width of coal pillar in the over-residual mining area of tunneling roadway, the stability, stress distribution and deformation and failure characteristics of inner roadway affected by creep are analyzed by theoretical calculation and numerical simulation, and the stability and stress distribution of residual coal pillar with different width are analyzed by means of theoretical calculation and numerical simulation. The results show that when the width of the pillar is 15m, the critical size of the pillar is 15m. After secondary creep failure, the displacement curve of the roadway can be divided into three stages, I creep increasing zone, 鈪，
本文编号：2436155
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