摘要
深部煤层受采动影响顶板破碎,开挖过程中容易出现较大的顶板下沉,严重影响巷道的施工安全。以东滩煤矿143下04(西)顺槽为研究对象,通过计算分析,研究了微拱支护作用机理。起拱高度对棚梁的变形和受力具有重要影响,顶板下沉随着拱高的增大而减小,棚梁的轴力和弯矩随着拱高的增大而增大,结合东滩煤矿实际情况,确定了最佳起拱高度为15cm,并提出了相应的支护参数和施工方案。微拱支护的现场应用表明,采用微拱支护后,巷道的顶板下沉量较小,且很快趋于稳定,验证了该支护方案的合理性。
When mining in the deep buried coal seams,the roof of the excavated gallery is usually broken due to the effect of the coal extraction.The broken roof could result in a safety hazard to the safe of the gallery construction.This paper presents the numerical analysis results on the effect of the camber arch support on the stability of the coal extraction galleries using the case history of 143 down04 gallery in Dongtan Coal Mine.The results indicate that height of the camber arch has a significant impact on the deformation and stresses in the supporting system.The settlement at the gallery roof decreases with the increase of the camber arch height,but the axial stress and the bending moments in the roof beam increase.The optimized arch height in the case history was determined to be 15 cm.The other parameters for the supporting design was also determined.The settlement observed in the coal roof supported by the camber arches were reduced and the settlement was stabilized in a short period of time.
出处
《土工基础》
2017年第6期697-701,共5页
Soil Engineering and Foundation
关键词
深部开采
巷道支护
破碎顶板
微拱支护
Deep Mining
Gallery Support
Broken Roof
Camber Arch Support
