Research on Safety Roof Span in Continuous Mining of Gold Vein Group Under Synergistic Concept

Xingxin NIE; Quan GAN; Jian GAO; Shanshan FENG

doi:10.11872/j.issn.1005-2518.2020.03.176

Gold Science and Technology >

2020 , Vol. 28 >Issue 3: 337 - 344

DOI: https://doi.org/10.11872/j.issn.1005-2518.2020.03.176

Mining Technology and Mine Management

Research on Safety Roof Span in Continuous Mining of Gold Vein Group Under Synergistic Concept

Xingxin NIE ,
Quan GAN ,
Jian GAO ,
Shanshan FENG

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School of Resources Engineering，Xi’an University of Architecture and Technology，Xi’an 710055，Shaanxi，China

Received date: 2019-11-04

Revised date: 2020-02-27

Online published: 2020-07-01

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Highlights

In order to mine strip cluster veins efficiently and safely，based on the concept of collaborative mining，the concept of cluster continuous mining and the continuous horizontal layered filling continuous mining method were proposed.First and foremost，the theoretical calculation methods of slab beam，Platts pressure arch method，thick-span ratio method，load transfer intersection line method and structural mechanics beam theory method were used，and the safety factor was introduced to calculate the roof span under different safety factors.The roof safety problem of the continuous mining method is studied.Furthermore，through the analysis，the safe stoping span of cluster continuous mining method is ranged from 23.0 m to 18.6 m. When the safety factor was 2.0，the number of roof span was modeled by ANSYS and verified by Flac^3D. For one thing，the numerical simulation results show that the maximum principal stress is 2.84 MPa，and the maximum displacement is 9.7 mm.There is only a small shear stress failure in the middle chamber.For another，the engineering example shows that: when the stope span is 18 m （rounding 18.6 m），there is rock block falling in a small local area of the roof，and the ratio of the length of the falling block to the roof span is 1.67%.The numerical simulation and engineering example results are alike.Finally，the concept of collaborative mining has strong coupling and inclusiveness.Besides，the new concept plays a guiding role for mining complex ore bodies in China，which can better meet the mining requirements.

Cite this article

Xingxin NIE , Quan GAN , Jian GAO , Shanshan FENG . Research on Safety Roof Span in Continuous Mining of Gold Vein Group Under Synergistic Concept[J]. Gold Science and Technology, 2020 , 28(3) : 337 -344 . DOI: 10.11872/j.issn.1005-2518.2020.03.176

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http://www.goldsci.ac.cn/article/2020/1005-2518/1005-2518-2020-28-3-337.shtml

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