The coal seam in the southern coal field of the Ordos Basin serves as the main aquifer, while the region is known for its high-intensity coal mining activities. The coupling effect of mine water and the strong disturbance caused by high-intensity mining have brought serious challenges to the stability of coal pillars. To address this, a formula for determining the reasonable width of coal pillars under the aforementioned coupling effect and establish a criterion for coal pillar instability in this paper. A case study was on the 11,215 working face at the Xiaojihan coal mine in the area to investigate coal pillar stability. Results indicate that the strength and stability of the coal pillar are affected by the water content, with a small water content increasing its strength and large water content weakening it. In high-intensity exploration of watery coal seams, the best stability of the coal pillar is achieved at optimal water content and mining rates. For the Xiaojihan coal mine, the optimum water content and mining rate are 3.31% and 20 m/d, respectively, ensuring the efficient mining of watery coal seams. Furthermore, this study's findings can provide valuable references for the mining design of coal mines with similar geological conditions in the region.

鄂尔多斯盆地南部煤田煤层是主要含水层，该地区以高强度煤炭开采活动而闻名。矿井水的耦合作用和高强度开采带来的强烈扰动给煤柱稳定性带来了严峻挑战。针对这一问题，本文提出了上述耦合效应下煤柱合理宽度的确定公式，并建立了煤柱失稳判据。以该地区小鸡罕煤矿11215工作面为例，调查煤柱稳定性。研究结果表明，煤柱的强度和稳定性受含水量的影响，含水量小则强度增强，含水量大则强度减弱。在含水煤层的高强度勘探中，在最佳的含水量和开采速度下，煤柱的稳定性达到最佳。小鸡罕煤矿最佳含水量为3.31%，最佳开采量为20 m/d，保证了含水煤层的高效开采。此外，本研究成果可为该地区类似地质条件煤矿的开采设计提供有价值的参考。