Study on Mining Method of Horizontal Pillar in the Middle Section of +1 000 m in Jinchuan No.2 Mining Area

Yongyuan KOU; Guang LI; Long ZOU; Fengshan MA; Jie GUO

doi:10.11872/j.issn.1005-2518.2020.03.122

Gold Science and Technology >

2020 , Vol. 28 >Issue 3: 353 - 362

DOI: https://doi.org/10.11872/j.issn.1005-2518.2020.03.122

Mining Technology and Mine Management

Study on Mining Method of Horizontal Pillar in the Middle Section of +1 000 m in Jinchuan No.2 Mining Area

Yongyuan KOU ^,¹ ,
Guang LI ^,²^,³^,⁴ ,
Long ZOU ¹ ,
Fengshan MA ²^,³ ,
Jie GUO ²^,³

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^1. Jinchuan Group Co. ，Ltd. ，Jinchang 737100，Gansu，China
^2. Key Laboratory of Shale Gas and Geoengineering，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China
^3. Institutions of Earth Science，Chinese Academy of Sciences，Beijing 100029，China
^4. University of Chinese Academy of Sciences，Beijing 100049，China

Received date: 2019-07-01

Revised date: 2020-03-06

Online published: 2020-07-01

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Highlights

The ore body in the No.2 mining area of Jinchuan mine is exploited at the same time in the middle section of +1 000 m and +850 m.With the continuous development of mining，some technical problems in the recovery stage of the horizontal pillar in the middle section of +1 000 m are also highlighted.In the face of more and more serious actual situation，it is necessary to study the stability of horizontal pillar and filling body thoroughly.A detailed field investigation was conducted on the mining environment of the horizontal pillar in the middle section of +1 000 m.On this basis，using the ANSYS and FLAC^3D numerical simulation software，the trend analysis of the stress and displacement of the filling body and the ground surface during the recovery of the horizontal ore pillar in the two mining area was analyzed，and the underground filling in the two mine area was revealed.The dynamic pressure distribution law of the body and the ground surface during the whole mining process，the stability of the filling body during the mining of the +1 000 m level pillar in the No.2 mining area was synthetically evaluated，and the stability of the 700 m and +850 m middle section mining was predicted by this method.The following conclusions are mainly obtained：During the mining process，the stress appears obviously，the accumulative displacement of the upper and lower plates is larger.When the thickness of the horizontal pillar is 20~30 m，the stress changes in the pillar，the maximum principal stress reaches the peak，the plastic failure area is in the middle of the rich ore body and has the through phenomenon，and the plastic failure of the pillar is all when the thickness of the horizontal pillar is 20 m.The filling body begins to destroy from the part of the contact zone of the surrounding rock and develops to the center of the filling body，and the filling body on the upper plate is seriously damaged than the filling body on the foot wall.According to the mining practice in the middle section of +1 000 m in the two mining area，two kinds of mining schemes are put forward and compared.The results show that during the mining process，the stress appears obviously，the accumulative displacement of the upper and lower plates is larger，and the two schemes have not appeared the phenomenon of large area collapse.Compared to the comprehensive stress，displacement and plastic failure area，the scheme two is better than the scheme one，but the two schemes are faced with the danger of large area plastic failure and local instability of the horizontal pillar at the end of the pillar mining.

Cite this article

Yongyuan KOU , Guang LI , Long ZOU , Fengshan MA , Jie GUO . Study on Mining Method of Horizontal Pillar in the Middle Section of +1 000 m in Jinchuan No.2 Mining Area[J]. Gold Science and Technology, 2020 , 28(3) : 353 -362 . DOI: 10.11872/j.issn.1005-2518.2020.03.122

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