Abstract
The stability of the surrounding rock is the key problem regarding the normal use of coal mine roadways, and the floor heave of roadways is one of the key factors that can restrict high-yield and high-efficiency mining. Based on the 1305 auxiliary transportation roadway geological conditions in the Dananhu No. 1 Coal Mine, Xinjiang, the mechanism of roadway floor heave was studied by field geological investigation, theoretical analysis, and numerical simulation. We think that the surrounding rock of the roadway presents asymmetrical shrinkage under the original support condition, and it is the extrusion flow type floor heave. The bottom without support and influence of mining are the important causes of floor heave. Therefore, the optimal support scheme is proposed and verified. The results show that the maximum damage depth of the roadway floor is 3.2 m, and the damage depth of the floor of roadway ribs is 3.05 m. The floor heave was decreased from 735 mm to 268 mm, and the force of the rib bolts was reduced from 309 kN to 90 kN after using the optimization supporting scheme. This scheme effectively alleviated the “squeeze” effect of the two ribs on the soft rock floor, and the surrounding rock system achieves long-term stability after optimized support. This provides scientific guidance for field safe mining.
Highlights
At present, there are many problems regarding the safe and efficient development of coal in Western China
A lot of engineering practice and scientific research have proved that the key to the normal use of the roadway is to ensure the stability of the surrounding rock of the roadway [1,2,3]
This paper mainly studies the effects of the mechanical properties of the floor rock, the particle-compacting degree in the filling area, the vertical support degree of the roadside support body, and the stress concentration of solid coal on the bottom heave of goaf filling and the filling device
Summary
There are many problems regarding the safe and efficient development of coal in Western China. The deformation of the filling body and roadway side wall is mainly compressive strain, so comprehensive analysis shows that different areas and different levels of strengthening support are needed in different influence periods It can be seen from the above research that experts have done a lot of research on the mechanism and control technology of roadway floor heave, and they have drawn many meaningful conclusions by using physical similar simulation and numerical simulation. On the basis of the experts’ research results, the author first relies on the deformation characteristics of the surrounding rock, the supporting structure, and the stress state of the mining roadway in the soft roof–coal–floor coal seams’ fully mechanized top coal caving face of Dananhu No 1 coal mine to carry out on-site monitoring and calculation analysis.
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