深井软岩破碎巷道底臌原因及处置技术研究

Research on the floor heave reasons and supporting measures of deep soft-fractured rock roadway

根据顾北煤矿南翼(11-2)胶带机巷道工程实际,依据长期的现场调查和变形监测,对顾北矿区深井软岩破碎巷道底臌影响因素、特性进行了分析,得出了底臌主要原因,认为底臌主要是由于巷道底板处于敞开状态而成为巷道变形和应力释放的主要场所,软弱破碎的围岩在地应力作用下挤压流入到巷道内,形成较大的挤压流动性底臌。在此基础上,提出了采用混凝土反拱地坪、深浅孔注浆、高预应力组合锚索的针对深井软岩破碎巷道底臌综合处置技术,同时研制开发底板锚索钻机,解决了底板组合锚索孔施工的困难。现场的跟踪监测表明,该技术能有效治理底臌还能加强两帮稳定性。

The south wing （11-2） conveyor roadway at Gubei Coal Mine is in a fauh zone. The influence factors and characteristics of floor heave in this fractured roadway were analyzed through site investigations and deformation monitoring. The study indicates that the main causes of floor heave are the squeezing and flowing of fractured rock mass, which means the floor becomes the area for releasing stress and deformation because of no support. As a result, the soft-fractured surrounding rock feeds into the roadway under high stress and causes floor heave. Therefore, a techneque, which uses reverse arch concrete floor, grouting, and high pre-stressed combined cable to control floor heave, is proposed. In addition, a floor cable drilling machine has been developed to overcome the difficulty in drilling the cable holes. The site monitoring and observations indicates that the technique can not only improve the floor stability permanently, but also effectively enhance the stability of roadway walls.