Abstract
Lining is often used as the last line of defense in deep large section chamber. Under the asymmetric load, it is easy to damage, resulting in the overall repair of the chamber. Aiming at this problem, taking the pump house in Wanfu Coal Mine under construction in China as an engineering example, we analyzed the asymmetric failure of pump house lining caused by construction disturbance, established the lining mechanical model and quantitative evaluation indexes, such as bending moment change rate, bending moment balance rate, displacement change rate and displacement balance rate, studied the influence mechanism of asymmetrical coefficient, section size and lining thickness on the mechanical behavior of lining, and proposed the control measures of deep large section chamber with the core of “strengthening asymmetric support, reducing section size and improving lining strength”. The field monitoring shows that the asymmetric deformation of the pump house is effectively controlled, and the maximum displacement is only 7.3 mm, which ensures the long-term stability of the chamber.
Highlights
With the depletion of shallow coal resources and the improvement of coal mining modernization levels, the mine is developing onto a large scale, and there are more and more large section chambers [1,2]
This paper takes the permanent pump house of Wanfu Coal Mine in China as the engineering background, establishes the lining mechanical model and quantitative evaluation index based on an asymmetric coefficient, studies the influence mechanism of asymmetric coefficient, section size and lining thickness on lining mechanical behavior, proposes the control method of a deep large section chamber and guides the reinforcement of a permanent pump house in the Wanfu Coal Mine
For the lining chamber subjected to secondary disturbance, the asymmetric design of bolt mesh spray should be carried out, the support strength of the disturbed side should be strengthened, and the strength of the surrounding rock should be restored through grouting and other measures to reduce the asymmetric load of the lining
Summary
With the depletion of shallow coal resources and the improvement of coal mining modernization levels, the mine is developing onto a large scale, and there are more and more large section chambers [1,2]. This paper takes the permanent pump house of Wanfu Coal Mine in China as the engineering background, establishes the lining mechanical model and quantitative evaluation index based on an asymmetric coefficient, studies the influence mechanism of asymmetric coefficient, section size and lining thickness on lining mechanical behavior, proposes the control method of a deep large section chamber and guides the reinforcement of a permanent pump house in the Wanfu Coal Mine. Due to the influence of water distribution drift and inside sump excavation, the original stable lining of the pump house shows asymmetric failure characteristics, and the deformation of the lining near the disturbed side is far greater than that of the other side. The uniform 5looaf d14 on the right arch crown, straight wall and bottom arch is λq, λq2 and λq, respectively
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