程潮铁矿西区采空区地表塌陷机制与变形规律初探

doi:10.13722/j.cnki.jrme.2017.1095

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Abstract

Taking west area of Chengchao iron mine as background engineering. According to the analysis of geological survey and the monitoring results from horizontal displacement and subsidence displacement in the west area of Chengchao Iron mine，and combining with approaches of drill-hole monitoring in goaf roof and high-density electrical prospecting in cave region，then the roof collapse characteristics and the ground collapse mechanism are analyzed，besides the law of surface deformation after ground collapse. The research results indicate that the process of goaf roof collapse is intermittent，and whole sinking occurs when the goaf roof collapse spreads upwards to gypsum stratum. Large amounts of groundwater are deposited in rock fractures and karst caves due to the aquiclude of gypsum，which has great influence on surface subsidence in preliminary stage of mining. High-density electrical prospecting results prove that the essential reason to the surface collapse is the rapid increased negative pressure generated by fast dewatering after gypsum stratum collapsed. Under the action of this mechanism，the location of surface collapse may be either right above the mined-out or near the mined-out boundary. Surface deformation extends outward with funnel-shaped tendency，and the displacements increasing timing of measuring points corresponds to the proceeding of underground mining well，showing that rock disturbance caused by underground mining has already extended to surface and ground collapse is controlled by the underground mining.

Key words： mining engineering underground mining mechanism of ground collapse mine monitoring surface deformation

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1095 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4262

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