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| Study on surface deformation of protective coal pillar mining in Yangdong Mine |
| Zhang Menghua |
| Water Cultural Relics Survey Team of China National Administration of Coal Geology, Handan 056000, China |
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Abstract In order to solve the problem of limited actual mining reserves and liberation of stagnant coal in Yangdong Mine, on the basis of controlling surface deformation, the method of mining protective coal pillars was used to improve the recovery rate of coal and prolong the production life of the mine. In this paper, the probability integral model was used to predict and analyze the surface deformation value, and the mining damage characteristics of important structures caused by the mining of protective coal pillars in industrial square were studied. The influence degree of important structures and the deformation of wall and ground in the mining of protective coal pillars in industrial square were analyzed. On this basis, the corresponding maintenance measures were formulated. The results showed that the maximum surface subsidence value obtained by the probability integral model was 1.7 m, the maximum horizontal displacement value was 0.51 mm / m, the maximum tilt value was 16 mm / m, and the curvature was 0.68 ( 10-3 / m ). It was judged that the building outside the exchange station would be damaged by grade IV. According to the results, the wall was monitored, and the repair measures were made. At the same time, the ground was monitored, and the cracks were repaired in time to reduce the damage degree of mining to the surface, so as to protect the surface buildings and realize the reasonable and effective mining of coal.
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