关键词: 深井巷道, 高应力场, 滑移型底鼓, 钢管混凝土桩, 抗滑移

Abstract: Floor heave is a common problem for deep roadways, such as in mines, with sliding mode floor heave being particularly difficult to control. In this article, the large deformation of a roadway on the 850th level of the north wing of Yangdong mine was studied. The mechanism of sliding, which destroyed the roadway floor, was analyzed using a numerical simulation method and the use of concrete-filled steel tube piles of various support densities was proposed as an active anti-sliding solution. The experimental results showed that the high stress environment, high clay content of the mineral rock, and the accumulation of cracks and water were the main factors that lead to the rock easily disintegrating, allowing for a large deformation of the roadway. Concrete-filled steel tube piles prevented the formation of a slip surface and improved the strength of the sliding face. When the arrangement density of the anti-slip piles was increased, the floor heave of the roadway gradually dropped. The depth of the floor heave damage decreased and stabilized under certain arrangement densities. Interestingly, the force on each pile increased toward the center of the arrangement, which suggest that if the pile arrangement density is higher, the force on each pile will be lower, and the force on the piles in the middle, or inside of the roadway floor, will be larger than that of the piles on either side. The results indicated that the floor heave of the roadway can be effectively controlled, allowing normal mining operations to resume; this suggests that concrete filled steel tube piles are a suitable and promising method to control floor heave.