煤矿地下水库人工坝体嵌入煤柱/体的构筑参数优化研究

Research on Optimization of Cutting Parameters for Structuring Artificial Dam around Underground Reservoir in Coal Mine

为了得到煤矿地下水库人工坝体嵌入煤柱/体的掏槽构筑作业的合理参数,利用FLAC;数值模拟软件,以神东浅埋大采高典型开采条件为背景,通过设置不同掏槽深度和掏槽位置,对拟构筑人工坝体的巷道两帮煤体受掏槽作业及后续采空区地下水库储水外推力影响下的塑性区发育及煤体位移等开展了研究。结果表明,巷道帮部掏槽深度越大,越有利于减少采空区地下水库储水的渗漏通道,但会在煤体内部原始弹性区新增发育一定范围塑性区;而掏槽位置越靠近外侧巷道口,掏槽处直至巷道口范围的煤体越易在储水外推力作用下发生整体剪切滑移,造成溃坝危险。据此基于不同掏槽参数对帮部煤体稳定性的影响规律,确定了神东矿区典型开采条件下的合理掏槽参数。

In order to obtain the reasonable parameters of cutting construction operation of artificia dam embedded in coal pillar/body of underground reservoir in coal mine,using FLAC;numerica simulation software,taking the typical mining conditions of Shendong shallow buried large mining height as the background,through setting different cutting depth and cutting position,the developmen of plastic zone and coal displacement of two sides of roadway to be constructed artificial dam under the influence of cutting operation and subsequent water storage external thrust of underground reservoir in goaf were studied.The results show that the larger the cut depth in the side of the roadway,the more favorable it is to reduce the leakage channel of underground reservoir water storage in the goaf,but a certain range of plastic zone will be developed in the original elastic zone inside the coal body;and the closer the cut position is to the outer roadway,the easier the coal body from the cut to the roadway is to have overall shear slip under the external thrust of water storage,resulting in the risk of dam break Based on the influence law of different cutting parameters on the stability of coal body in the side o the roadway,the reasonable cutting parameters under typical mining conditions in Shendong mining area are determined.