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Ultimately exposed roof area prediction of bauxite deposit goaf based on macro joint damage

International Journal of Mining Science and Technology 2020年第5期30卷 699-704页

作者： Lichun Jiang Chao Yang Huazhe Jiao School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510640China Institute of Safety Science and Engineering South China University of TechnologyGuangzhou 510640China School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454003China

The ultimately exposed roof area(UERA)of goaf is crucial to the safety and economics of underground *** prediction models do not consider the mechanical weakness of rock mass and ignore the influence of the joint damage factor,causing a large predicted exposure area with a high roof falling *** work adopted joint damage factor to derive a new UERA prediction *** relationships between the UERA(S)and the span ratio(m),the density(k)and the diameter of fracture(d)were analysed by the new prediction *** results showed that the exposed area S and the span ratio m have a U-shaped curve *** S decreases with the increase of m and then increases when m is beyond *** exposed roof area S is in an inversely proportional power-law relationship with the fracture surface density k,and the curvature of the S-k relationship curve decreases when d=0.5 and k>7,and S is close to *** is a negative correlation between S and the fracture surface diameter d,the curvature of the S-d curve decreases with the increase of d and k,and the variation rate increases first and then decreases with the increase of d;when k=0.5 and d>9,S is close to *** predicted values of the UERA prediction model are 119.3,112.8,and 114.6 m2 with different joint damage parameters,which are slightly smaller than the actual critical exposure area of a roof(S=120 m2).The case study shows that the alternative prediction model is reasonable and acceptable and provides new theoretical support for the underground mining safety of sedimentary bauxite ore.

关键词： Ultimately exposed roof area bauxite goaf Prediction model Macro joint damage

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