Study on the optic-electric perception experiment of overburden movement and separation evolution in the mining area under super-thick conglomerates
To grasp the fine development law of overburden movement and separation evolution during extra thick coal seam mining under super-thick conglomerates,taking the 1305 working face a mine in Yonglong mining area as an example,based on similar physical model test,the full-cycle multi-physical field response characteristics of rock strata movement deformation and fracture were studied by using the self-developed optic-electric multi-parameter distributed perception sys-tem.The experimental results show that optic-electric perception system can accurately characterize the deformation state and spatiotemporal evolution law inside the rock mass.The frac-ture caving and fracture development patterns of rock strata have obvious corresponding relation-ships with multiple parameters such as strain,current and resistivity in the full period,optic-elec-tric characterization model of lateral and vertical zoning of mining overburden was established,the optic-electric real-time quantitative detection of overburden migration and"three horizontal zones and three vertical zones"was realized.During the period of 3 # coal seam mining,the influence range of advanced stress on the overburden reached 45-54 m,and the distance of direct roof lag collapse was 9-18 m.The re compaction area of the overburden after mining is located 150-204 m behind the working face.The ratio of strain to current is that the height of the first step corre-sponds to the interface of the caving zone,while the height of the third step corresponds to the in-terface of the water conducting fracture zone.The height of the overburden caving zone of 3 # coal seam is 44.73-48.00 m,and the development height of the water flowing fractured zone is 256.29-276.54 m,with an overall relative deviation of less than 5％compared to the measured height of the model.Based on the characterization results of optic-electric,the spatiotemporal evo-lution mechanism of overburden deformation and separation layer development was revealed,mainly manifested as"large crack height","step shape","lagging collapse"and other character-istics.The multi-parameter distributed perception system provides reliable geological guarantee technology for the prevention and control of separation layer water hazards and mine safety pro-duction.
overburden migrationcomprehensive perception of optic-electricquantitative characterizationevolutionary lawsmodel test
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