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为研究软岩巷道的支护技术,确保巷道稳定和正常使用,采用X射线衍射荧光光谱仪对三水平回风石门围岩进行了岩性组分分析,应用钻孔探测方法测出了围岩松动圈范围和裂隙分布区域.针对围岩岩性、松动圈范围和巷道所处的应力环境等因素,支护形式确定为初次柔性支护即锚网喷支护与预应力锚索支护,二次支护用高强度支护即锚索与全断面锚注加固组成的复合支护结构.工程实践结果表明:支护1个月后,顶底板及两帮移近量在30~35 mm范围内;累计观测75 d后,顶底板和两帮移近量均控制在45 mm以内,围岩变形量较小,保证了巷道的稳定和正常使用.
In order to study the supporting technology of soft rock roadway and ensure the stability and normal use of the roadway, the rock component analysis of surrounding rock of the three horizontal return stone was carried out by X-ray fluorescence spectrometer. The looseness of surrounding rock was measured by drilling detection method Circle range and fissure distribution area.According to the lithology of surrounding rock, the scope of the loose ring and the stress environment in the roadway, the support form is determined as the first flexible support, that is, the anchor and shotcrete support and prestressed anchor cable support, and the second Sub-support with high-strength support that is, anchor and full-face anchor grouting composite support structure.Experimental results show that: 1 month after the support, the top floor and the two closer to move in the range of 30 ~ 35 mm After 75 days of cumulative observation, the amount of roof and floor and the two approaches are controlled within 45 mm, the deformation of surrounding rock is small, which ensures the stability and normal use of roadway.