CAJ | 학술논문

为解决开采不同厚度上保护层对下伏煤体卸压瓦斯渗流特性影响的问题。利用自主研制的固气耦合物理相似模拟实验台，对不同条件下上保护层开采时，被保护层卸压瓦斯渗流规律进行了研究。实验结果表明：随着工作面的推进，瓦斯渗流速度的变化趋势经历了由原始渗透性先降低、后升高、再降低、再升高、最后保持不变的过程，采空区瓦斯渗流性最终大于原始渗透性。通过对实验数据整理并拟合曲线，当上保护层开采完毕后，被保护层沿走向方向其渗透率变化曲线呈马鞍形。在保护层间距一定时，采高越大，下伏煤层在采动平衡后相对于原始的瓦斯渗透率增高就越明显，且对下伏煤层的影响范围也越大。
위해결개채불동후도상보호층대하복매체사압와사삼류특성영향적문제。이용자주연제적고기우합물리상사모의실험태，대불동조건하상보호층개채시，피보호층사압와사삼류규률진행료연구。실험결과표명：수착공작면적추진，와사삼류속도적변화추세경력료유원시삼투성선강저、후승고、재강저、재승고、최후보지불변적과정，채공구와사삼류성최종대우원시삼투성。통과대실험수거정리병의합곡선，당상보호층개채완필후，피보호층연주향방향기삼투솔변화곡선정마안형。재보호층간거일정시，채고월대，하복매층재채동평형후상대우원시적와사삼투솔증고취월명현，차대하복매층적영향범위야월대。
To solve problems regarding the influence of pressure-relief gas seepage of underlying coal seam caused by mining different thicknesses of upper protective layer, this paper studied the rules of pressure-relief gas seepage under different conditions of mining upper protective layer. An independently developed solid-gas coupling, physical resemblance simulation platform was used in this study. The experimental result shows that with the working face advance, the gas seepage velocity variation trend first decrease from the original permeability, then increase, then decrease and increase again, then remain the same. The permeability in the gob area eventually is greater than the original one. The result from data processing and curve fitting shows that when the upper protective layer is completely mined out, the permeability change curve along the strike direction of protective layer is in a shape of saddle. With a fixed thickness of the protective layer, the greater the mining height is, the more obviously is the increment of gas permeability relative to the original value after the underlying coal seam reaches a balance state of mining, and the influence area of underlying seam is also larger.