急倾斜煤层矸石充填采场围岩运移规律数值模拟分析

急倾斜煤层矸石充填开采可以有效的抑制煤层及顶底板动力现象,有利于提高“支架-围岩”系统稳定性。在对急倾斜煤层矸石充填开采围岩移动变形的影响因素分析的基础上,运用UDEC数值模拟软件,对不同煤层倾角、埋深、充填率和充填体强度条件下,围岩的运移规律进行了研究。研究表明：随着煤层倾角的增加,顶板变形量和扰动范围减小,而底板移动变形逐渐增加|埋深越深,围岩的应力集中程度和最大下沉值越高|随着充填率和充填体强度的增加,采场围岩的移动变形量减少,稳定性增强。该研究可以为急倾斜煤层安全高效开采提供借鉴。

Numerical simulation of surrounding rock migration law in steeply inclined coal seam rock backfill mining

Steeply inclined coal seam rock backfill mining can effectively restrain the dynamic phenomena of coal seam and roof and floor, and improve the stability of "support-surrounding rock" system. Based on the analysis of influencing factors of surrounding rock movement and deformation, by using UDEC numerical simulation software, the migration law of surrounding rock under different coal seam dip angle, buried depth, filling rate and filling strength conditions was studied. The results show that with the increase of coal seam dip angle, the deformation and disturbance range of roof decrease, while the displacement deformation and failure of floor increase gradually; the deeper the burial depth, the higher the stress concentration and maximum subsidence value of surrounding rock; with the increase of filling rate and filling strength, the displacement deformation amount of surrounding rock decreases and the stability increases. This study can provide a reference for safe and efficient mining of steeply inclined coal seam.