为研究大采高综放工作面窄煤柱沿空掘巷动压巷道矿压控制问题，以宁煤集团羊场湾煤矿2-2特厚煤层130205大采高综放工作面回风巷为工程背景，在原巷道留设35 m护巷煤柱全断面锚索支护已无法维护采掘巷道断面条件下进行窄煤柱研究。采用现场实测、数值模拟和理论预测3者相结合的研究方法，建立了巷道围岩内、外应力场力学结构模型，运用FLAC^3D模拟回风巷道5、6、8、10、15 m不同宽度煤柱围岩应力分布规律。理论计算内应力场为9.5～10.3 m，窄煤柱合理宽度为5.14～5.56 m；数值模拟显示0～10 m为低应力区，10～14 m为应力峰值区，14～45 m为应力高值区、缓降区，超过45 m后逐渐趋于原岩应力，煤柱内的支承压力呈单峰分布，通过研究确定护巷煤柱尺寸为6 m。经现场应用得出，6 m窄煤柱回风巷道回采期间两帮最大变形量为241 mm，顶底板最大变形量为92 mm，巷道支护设计合理，窄煤柱注浆效果显著，窄煤柱巷道回采期间整体满足生产要求。

In order to study the pressure control of the dynamic pressure roadway along the roadway with narrow coal pillars in the fully mechanized top coal caving mining face，this article takes the return roadway of No.130205 large mining height fully mechanized caving face in 2-2 extra-thick coal seam of Yangchangwan Coal Mine of Ningmei Group as the engineering background. It is impossible to maintain the excavation roadway with the full cross-section anchor cable support of the 35 m protection lane coal pillar in the original roadway.A narrow coal pillar study was performed under section conditions. A combination of on-site measurement，numerical simulation，and theoretical prediction was used to establish a mechanical structure model of the internal and external stress fields of the surrounding rock of the roadway. FLAC^3D was used to simulate 5，6，8，10，and 15 m coal pillars with different widths in the return airway. Stress distribution of surrounding rocks. The theoretical calculation of the internal stress field is in the range of 9.5～10.3 m，and the reasonable width of a narrow coal pillar is 5.14～5.56 m; numerical simulation shows that 0～10 m is a low stress area，10～14 m is a stress peak area，and 14～45 m is a high stress value. In the area and slow-down area，after 45 m，the original rock stress gradually increases，and the supporting pressure in the coal pillars is distributed in a single peak. The size of the coal pillars for the protection lane is determined through research to be 6 m. According to the field application，the maximum deformation of the two sides during the mining of the 6m narrow coal pillar air return roadway is 241 mm，and the maximum deformation value of the top and bottom plates is 92 mm. The roadway support design is reasonable，the narrow coal pillar grouting effect is significant，and the narrow coal pillar roadway. The production requirements were fully met during the extraction.

0 引言

1 矿井工作面概况

2 内应力场范围及煤柱合理宽度确定

   2.1 内应场计算

   2.2 窄煤柱合理宽度确定

   2.3 支承压力数值模拟

   2.4 窄煤柱回风巷支护设计

   2.5 回采期间回风巷锚索支护受力分析

3 窄煤柱沿空巷道围岩变形现场实测

   3.1 巷道围岩变形分析

   3.2 巷道围锚杆受力分析

   3.3 工作面前方支承压力监测

   3.4 煤柱内裂隙形态探测及注浆效果探究

   3.5 窄煤柱工作面现场效果

4 结论