Stability Analysis of Stope by Small-Scale Mechanized Shrinkage Mining for Steeply Inclined and Extremely Thin Veins
Based on the small-scale mechanized shrinkage mining technology forthe steeply inclined and extremely thin veins in the Shanhu tungsten mine,the stability of stope in the mining process has been analyzed by numerical modeling,and the length of stope,the safe distance between adjacent stopes should be controlled and the stopping sequence have been discussed.The results show that:1)After the ore body was mined,the hanging wall and footwall surrounding rock of stope have the opposite displacement mainly horizontal displacement,the stress concentration occurs at the contact between the upper and lower ends of the goaf and the roof and floor,the stress of surrounding rock on both sides of the goaf is reduced.2)The stope length has little influence on the stability of stope,and the stope length can be increased from 100 m in the test stage to 150-200 m,so as to improve the production capacity of a single stope.3)In order to reduce the mining disturbance of the adjacent stope,the safety distance between two adjacent stopes should be controlled above 4 m,and also should be increased appropriately when the rock mass condition is poor in some parts.4)For stopes adjacent to each other,it is more beneficial to the stability control when the body to be mined is located in the movement range of the footwall surrounding rock of the first stope,so it is recommended to adopt a stopping sequence from hanging wall to footwall.The research results can provide some parameters reference for mining engineering practice.
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