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Influence of Goaf Location on Deformation of High-steep Hard Rock Slope
Underground mining is one of the factors affecting slope deformation,and goaf location affects the degree of such deformation.In this paper,we summarize the structural characteristics of three mining slopes and corresponding goaf location,take the Yongsheng coal mine as the research object,and simulate the formation of the goaf during two times of mining with Particle Flow Code (PFC2D) to study the influence of the distance D (negative toward the inside of the slope) from the right boundary of the goaf to the slope shoulder on the deformation of high-steep hard rock slopes.The following observations can be drawn from the results:The settlement curve of the overburden rock in the goaf assumes an approximate “U” shape.The settlement range first remains unchanged and then expands as D increases.The lateral deformation of the overburden rock towards the free face is more obvious,and the disturbed range of the overburden rock gradually increases; as the second time of mining proceeds,the rock body in the steep cliff area rapidly deforms,and its deformation at D> -50 m is much larger than that at D≤-50 m.This study proposes that subsequent mining of the Yongsheng coal mine should meet D< -50 m.It also provides a reference for the mining interval in the case of such high-steep hard rock slopes.
Influence of Goaf Location on Deformation of High-steep Hard Rock Slope
Underground mining is one of the factors affecting slope deformation,and goaf location affects the degree of such deformation.In this paper,we summarize the structural characteristics of three mining slopes and corresponding goaf location,take the Yongsheng coal mine as the research object,and simulate the formation of the goaf during two times of mining with Particle Flow Code (PFC2D) to study the influence of the distance D (negative toward the inside of the slope) from the right boundary of the goaf to the slope shoulder on the deformation of high-steep hard rock slopes.The following observations can be drawn from the results:The settlement curve of the overburden rock in the goaf assumes an approximate “U” shape.The settlement range first remains unchanged and then expands as D increases.The lateral deformation of the overburden rock towards the free face is more obvious,and the disturbed range of the overburden rock gradually increases; as the second time of mining proceeds,the rock body in the steep cliff area rapidly deforms,and its deformation at D> -50 m is much larger than that at D≤-50 m.This study proposes that subsequent mining of the Yongsheng coal mine should meet D< -50 m.It also provides a reference for the mining interval in the case of such high-steep hard rock slopes.
Influence of Goaf Location on Deformation of High-steep Hard Rock Slope
JI Lan (author) / ZHAO Jianjun (author) / WAN Xun (author) / LI Qingmiao (author) / WU Enge (author)
2022
Article (Journal)
Electronic Resource
Unknown
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