金川二矿区+1 000 m中段水平矿柱回采方法研究

doi:10.11872/j.issn.1005-2518.2020.03.122

黄金科学技术 ›› 2020, Vol. 28 ›› Issue (3): 353-362.doi: 10.11872/j.issn.1005-2518.2020.03.122

金川二矿区+1 000 m中段水平矿柱回采方法研究

寇永渊¹(),李光^2,^3,⁴(),邹龙¹,马凤山^2,³,郭捷^2,³

^1.金川集团股份有限公司，甘肃金昌 737100
^2.中国科学院地质与地球物理研究所，中国科学院页岩气与地质工程重点实验室，北京 100029
^3.中国科学院地球科学研究院，北京 100029
^4.中国科学院大学，北京 100049

收稿日期:2019-07-01 修回日期:2020-03-06 出版日期:2020-06-30 发布日期:2020-07-01
通讯作者: 李光 E-mail:ekqkyy@jnmc.com;liguang@mail.iggcas.ac.cn
作者简介:寇永渊（1984 -），男，甘肃白银人，硕士研究生，从事采矿工程技术研究工作。ekqkyy@jnmc.com
基金资助:
国家自然科学基金面上项目“金属矿山地下采动引起的竖井变形破坏机理研究”(41772341);“深部高地应力采场围岩板裂化破坏机理研究”(41877274);国家自然科学基金重点项目“海底采矿对地质环境的胁迫影响与致灾机理”(41831293)

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

Yongyuan KOU¹(),Guang LI^2,^3,⁴(),Long ZOU¹,Fengshan MA^2,³,Jie GUO^2,³

^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:2019-07-01 Revised:2020-03-06 Online:2020-06-30 Published:2020-07-01
Contact: Guang LI E-mail:ekqkyy@jnmc.com;liguang@mail.iggcas.ac.cn

摘要/Abstract

摘要：

针对金川镍矿二矿区+1 000 m中段开采实际，利用ANSYS建立大型三维数值模型，基于FLAC^3D进行数值模拟计算，对+1 000 m中段水平矿柱回采期间充填体及地表的应力和位移变化趋势进行分析，综合评价了二矿区+1 000 m水平矿柱回采期间充填体的稳定性。研究结果表明：（1）在回采过程中，应力显现明显，上下盘累积位移量较大；当水平矿柱厚度为20~30 m时，矿柱应力变化显现剧烈，最大主应力值达到峰值；（2）充填体是从围岩接触带部分开始破坏，向充填体中央发展，靠近上盘的充填体比靠近下盘的充填体破坏严重；（3）提出了2种回采方案，并进行了对比分析，结果显示在回采过程中，应力显现明显，上下盘累积位移量较大，2种方案均未出现大面积坍塌灾变的现象。通过对比综合应力和位移变化曲线可知:方案二优于方案一，但2种方案在回采矿柱末期均面临着水平矿柱大面积塑性破坏和局部失稳的危险。

关键词: 金川矿区, 充填开采, 水平矿柱回采, 充填体变形, 矿柱稳定性, 数值模拟分析

Abstract:

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.

Key words: Jinchuan mining area, filling mining, horizontal pillar mining, filling deformation, pillar stability, numerical simulation analysis

中图分类号:

TD863

寇永渊, 李光, 邹龙, 马凤山, 郭捷. 金川二矿区+1 000 m中段水平矿柱回采方法研究[J]. 黄金科学技术, 2020, 28(3): 353-362.

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.

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岩性	抗压强度σ_c/MPa	抗拉强度σ_t /MPa	黏聚力c/MPa	内摩擦角φ/(°)	变形模量E_m /GPa	泊松比μ	体积模量K_m/GPa	剪切模量G_m/GPa
上盘围岩	39.19	1.72	2.10	34.19	15.89	0.25	8.63	2.88
下盘围岩	33.64	1.25	1.14	43.58	11.60	0.25	2.95	0.97
贫矿	24.11	0.95	0.85	38.45	3.16	0.29	1.03	0.28
富矿	22.24	0.98	1.10	38.45	2.99	0.26	1.96	0.62
充填体	13.21	0.50	0.76	36.60	0.87	0.32	0.81	0.57
断层	9.50	0.09	0.24	35.00	3.20	0.25	2.13	2.00

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金川二矿区+1 000 m中段水平矿柱回采方法研究

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

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