黄土沟壑区沟谷坡度对采动裂缝发育规律的影响

Influence of Valley Slope in Loess Gully Region on Mining-induced Fractures Development Law

为了研究黄土沟壑区开采时,沟谷坡度对采动引起的滑动型地裂缝发育规律的影响,以神东矿区采矿地质条件为基础,采用UDEC数值模拟软件分析研究了滑动型地裂缝在不同沟谷坡度情况下的裂缝距、裂缝角和坡度关系,得到了不同沟谷坡度下的滑动型地裂缝的裂缝距和裂缝角。结果表明:在黄土沟壑区开采时,滑动型裂缝的裂缝距和裂缝角与沟谷坡度呈二次多项式关系;随着沟谷坡度的增大,裂缝距先增大后减小,裂缝角先减小后增大;对它们的关系式求极限得滑动型裂缝距和裂缝角达到极值时对应的沟谷坡度;滑动型地裂缝对煤矿安全和生态都会造成一定的危害,针对此问题提出了一些治理措施。

In order to study the influence of valley slope on mining - induced sliding type fracture development law during loess gully region mining, based on mine mining geological conditions, we use numerical simulation software UDEC to analyze and study the relationship between crack distance, crack angle of sliding type crack and slope under different valley slope, and get the crack distance, crack angle of sliding type crack under different conditions of valley slope. The results show that crack angle and crack distance of slide - type crack and valley slope presents a quadratic polynomial relation during mining in loess gully region ; with the increase of valley slope, the crack distance increases first and then decreases, the crack angle decreases first and then increases; valley slope is obtained when crack distance, crack angle of sliding type crack reach extreme value ; sliding type ground fissures in coal mine will cause certain harm for coal mine safety and ecology, we propose some measures for this problem.