Abstract
The mining of coal resources in eastern China has entered the stage of deep mining, and many mines have reached the depth of 1000 meters. Different from shallow and moderate depth mining, the temporal and spatial evolution regulation of surface movement and deformation under deep mining has its particularity. Combining with the geological and mining conditions of Fengfeng mining area, this paper systematically studies the characteristics of surface movement under the condition of shallow, moderate, and near kilometer mining depth. By means of field measurement, InSAR monitoring, we get the subsidence data under different mining depth and get the relevant subsidence parameters by inversion. Through comparative analysis, the special law of subsidence under the mining depth of 1000 meters is obtained. The results show that under the condition of nearly 1000 meters mining depth, the surface movement and deformation have the characteristics of large displacement angle, small displacement deformation value, and large main influence radius. The regulation of small proportion of active period of maximum subsidence point, gentle shape of surface movement basin, and low mining adequacy are obtained. The research results provide technical references for deep mining under buildings, railways, and water bodies and provide basis and reference for scientific mining and safe recovery of coal pillars in kilometer deep mine.
Highlights
Among the total coal reserves in China, 53.17% are buried deeper than 1000 m. e average mining depth of stateowned coal mines increases at the rate of 10–25 m/a
According to mining subsidence theory, it is generally believed that the mining depth of coal seam less than 400 m is shallow mining, the mining depth of coal seam 400–700 m is moderate depth mining, and the mining depth of coal seam greater than 700 m is deep mining [2]
Zhang [10] studied the water inrush mechanism of the floor induced by deep mining based on the coupled mining pressure and confined pressure
Summary
Among the total coal reserves in China, 53.17% are buried deeper than 1000 m. e average mining depth of stateowned coal mines increases at the rate of 10–25 m/a. In the 1000 m mining depth, the mechanical environment of the mines changes greatly relative to shallow and moderate depth mining [3, 4], and the spatio-temporal evolution law of strata and surface movement is different from that of shallow and moderate depth mining [5,6,7] It is of great significance for the sustainable development of national resources to study the surface movement regulation under the condition of nearly 1000 m mining depth. Erefore, taking Fengfeng mining area as the research object, this paper studies the surface movement regulation at the mining depth of near 1000 meters by means of field measurement, InSAR monitoring, and comparative analysis Up to now, there are limited literatures on the surface subsidence law under near 1000 meters mining depth. erefore, taking Fengfeng mining area as the research object, this paper studies the surface movement regulation at the mining depth of near 1000 meters by means of field measurement, InSAR monitoring, and comparative analysis
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