Determination of Loose Boundaries in the Affected Area of Collapse Mining Based on the Combination of TRT Advanced Detection and Geological Drilling
The underground rock conditions of a copper nickel mine are poor.In the early stage,the collapse method was used to recover ore resources.Due to the long exposure time of the collapse mining site and the influence of mining disturbance,the mining area experienced roof collapse and side slope collapse before treatment,resulting in weakened mining technology conditions for the upper rock and making it impossible to safely extract over a million tons of ore resources under the current situation.On this basis,a detection method combining TRT advanced detection and geological drilling was adopted.The loose boundary roof elevation of the mining area affected by the collapse method with sill pillar was detected to be 760 m level,the upper wall boundary was approximately vertical,and the lower wall boundary was inferred based on a rock movement angle of 60°.The loose boundary roof elevation of the mining area affected by the collapse method without sill pillar was 755 m level,and the situation of the upper and lower walls was similar to that of the mining area affected by the collapse method with sill pillar.The detection results can provide a basis for the selection of mining methods,mining preparation engineering layout,and support methods for the ore resources in the area,so as to ensure safe and efficient underground production.
Collapse methodAffected area by miningTRT advanced detectionGeological drillingLoose boundary
NETL
NSTL
万方数据
