Abstract:

Based on the monitoring difficulties of dynamic ground fissure development characteristic and the problems of prior technology in the windy and sandy region with high tension caving mining, a new monitoring device had been invented, and the detail of operating method and processing technique of data had been described. Fixing rod, raster dial, pointer system, leveling base and other components constituted this device, the small variations of fissure form during the mining process can be obtained by projection value changes of pointer on the raster dial. It had obtained National Utility Model Patents and applied to monitor the dynamic ground fissure in 12406 working face. The application result indicates that the degree and time of expansion of dynamic ground fissure due to high tension mining caving is smaller than before. The development characteristic of dynamic ground fissure without obvious heads ,however,the width shows two ‘cracking-closure’ stages, with approximate equal durations. The process and characteristics of development of dynamic ground fissure has further validated ground movement and deformation caused by high tension and rapid caving mining.

Key words: high tension mining, dynamic ground fissure, development characteristic, monitoring device, system components