66 / 2021-11-30 09:30:42

Strong sliding floor heave mechanism and active anti-sliding controlling technology of concrete filled steel tube pile in deep roadway

deep roadway, high stress field, sliding mode floor heave, concrete filled steel tube pile, anti-slide

Resource Development and Utilization of Underground Space > 3. Disaster Prevention and Control of Deep Underground Engineering

Floor heave of deep roadway is very common, especially sliding mode floor heave is difficult to control. In this article law of strong large deformation of the track roadway of -850 level the north wing of Yangdong mine was studied. The mechanism of sliding and destroying of the roadway floor was analyzed by numerical simulation method, such as the active anti-sliding controlling floor heave technology of concrete filled steel tube pile and various support density are proposed in roadway floor. The experimental results have shown that high stress field environment, high clay mineral rock, and crack and engineering water accumulation are the main factors that lead to rock easy disintegrating with destruction and large deformation of roadway surrounding rock. The concrete pile of steel pipe has the function of restrain the formation of slip surface and improving the strength of sliding face. When the arrangement of anti-slip pile density was increased, the floor heave of roadway dropped gradually. The depth of the floor heave damage of the roadway was deceased and stabilized under certain support density. Therefore the force of anti-slide pile was reached from outside to inside, which suggest that the pile support density is higher, the force of pile is lower, and the force of piles in the middle or inside of roadway floor are larger than that of piles on both sides. The results obtained in this work indicate that the floor heave of roadway is effectively controlled, and the roadway ensures normal use of production and transportation. Therefore the concrete filled steel tube pile is a suitable and promising method to control floor heave.