Gold Science and Technology
img

Wechat

Adv. Search
Online Submission Peer Review Office Work

Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (5): 722-730.doi: 10.11872/j.issn.1005-2518.2019.05.722

• Mining Technology and Mine Management • Previous Articles     Next Articles

Research and Application of Artificial False Bottom in Mining of Orebody in Alteration Zone

Enxiang SONG1(),Qiang LI2,Jing ZHANG3(),Kang PENG3,4   

  1. 1. Songxian Shanjin Mining Co. ，Ltd. ，Songxian 471400，Henan，China
    2. Department of Business Management，Shandong Gold Group Co. ，Ltd. , Jinan 250010，Shandong, China
    3. School of Resources and Safety Engineering，Chongqing University，Chongqing 400044，China
    4. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China
  • Received:2018-10-29 Revised:2019-06-10 Online:2019-10-31 Published:2019-11-07
  • Contact: Jing ZHANG E-mail:309647732@qq.com;20172002022t@cqu.edu.cn

RichHTML

0

PDF (PC)

557

Abstract:

The main orebody of the mining area of Songxian Shanjin Mining Co. Ltd. is located in the M1 structural alteration zone and it is strictly controlled by the structural fracture zone.Its occurrence is basically consistent with the M1 structural alteration zone，which is a moderately stable orebody and due to the roof.The rock mass is broken，and the mining area is mainly developed by the upward approach filling method，so the high-grade top and bottom pillars are left behind.In order to ensure the stability of the stope，the top and bottom columns between the middle sections are effectively recovered，and the utilization rate of the orebody is improved.The mine design shall be constructed with artificial false bottoms after the end of the mining in the middle section，and the top and bottom pillars shall be recovered under the artificial false bottom.In order to ensure the recovery stability and ore recovery rate of the bottom and bottom columns under artificial false bottom，a manual false bottom plate mechanical model was established for the artificial false bottom approach，and the instability mechanism was analyzed by the theory of elastic mechanics.When the two sides of the column are filled with the filling body，the artificial false bottom of the roadway is known as the “soft-supported weak plate” structure，and it is easy to cause bending and tensile failure in the middle of the road top plate；and the safety factor is adopted in the case where the artificial false bottom thickness is determined.The method analyzes the influence of the width and height of the approach on the stability of the approach，and determines the safe and reasonable approach width of 3.5~4.0 m and the height of 3.0~4.0 m.According to the strength requirements and the results of the strength test of the mine backfill，the filling is carried out.The calculation of the reinforcement calculation at the bottom of the body is carried out by using a 1∶8 C-material cemented backing body，and the Φ12 mm steel bar with a mesh size of 300 mm×300 mm can increase the tensile strength of the artificial false bottom.The reinforcement design is carried out at the bottom，and the numerical simulation analysis of the false bottom displacement and the stress field change of the metal mesh at different positions in the artificial false bottom is carried out，and the safest and most reasonable laying position is the middle of the artificial false bottom.The findings applied to engineering practice，the results showed that the application of artificial false bottom of the top-pillar mines safe and effective mining.

Key words: structural alteration zone, drift filling mining method, artificial false bottom, instability mechanism, safety factor method, numerical simulation, mechanical model, metal mesh

CLC Number: 

  • TD853

Fig.1

Mechanical model of artificial false bottom"

Fig.2

Force analysis of the thin “plate” bearing layer"

Fig.3

Destructive form of the “soft-supported and weak plate” structure of the thin “plate” in the approach"

Table 1

Maximum half width requirement of the approach"

安全

系数

进路最大半宽要求l /m
h=0.3h=0.4h=0.5h=0.6h=0.7h=0.8h=0.9h=1.0h=1.1
η=1.02.32.42.52.62.8>2.0>2.8>2.8>2.8
η≥2.01.81.91.92.02.02.12.12.22.2

Fig.4

The l-η curve when artificial false bottom thickness h=0.3 m（a） and h=0.3~1.1 m（b）"

Table 2

Maximum height requirements for access"

安全

系数

进路最大高度要求M/m
h=0.3h=0.4h=0.5h=0.6h=0.7h=0.8h=0.9h=1.0h=1.1
η=2.03.23.43.84.04.44.85.0>5.0>5.0
η=1.04.85.0>5.0>5.0>5.0>5.0>5.0>5.0>5.0

Fig.5

The M-η curve when artificial false bottom thickness h=0.3 m（a）and h=0.3~1.1 m（b）"

Fig.6

Layout of tailings cemented backfill artificial false bottom reinforcement mesh"

Table 3

Physical and mechanical parameters of material"

材料密度/（kg·m-3）弹性模量/MPa泊松比抗压强度/MPa黏聚力/MPa摩擦角/（°）
1∶8充填体1 7601100.1440.3018
Φ12 mm钢筋7 8002.0×1050.20-200-

Fig.7

The z-direction displacement contour of scheme 1（a），scheme 2（b） and the z-direction displacement at bottom of the artificial false bottom（c）"

Fig.8

Maximum principal stress of the artificial false bottom filling body in scheme 1（a），scheme 2（b）and the bottom of the artificial false bottom filling body（c）"

Fig.9

Maximum tensile stress of the metal mesh of scheme 1（a） and scheme 2（b）"

Fig.10

Maximum tensile stress of transverse reinforcement（a） and longitudinal reinforcement（b） of metal mesh"

Fig.11

False bottom exposed by the approach mining"

1 彭康，李夕兵，彭述权，等. 海底下框架式分层充填法开采中矿岩稳定性分析[J]. 中南大学学报（自然科学版），2011，42（11）：3452-3458.
PengKang，LiXibing，PengShuquan，et al. Ore-rock stability of frame stope hierarchical level filling mining method in seabed mining[J].Journal of Central South University（Science and Technology），2011，42（11）：3452-3458.
2 彭康，李夕兵，彭述权，等.海下点柱式开采的有限元动态模拟分析[J]. 金属矿山，2009，39（10）：59-62.
PengKang，LiXibing，PengShuquan，et al. FE dynamic simulation analysis of in under-sea point pillar mining [J]. Metal Mine，2009，39（10）：59-62.
3 刘志义，甘泽，甘德清，等.近海矿体开采人工假底厚度优化及工程应用[J]. 金属矿山，2016，45（8）：54-57.
LiuZhiyi，GanZe，GanDeqing，et al.Thickness optimization and engineering application of artificial false bottom in offshore ore mining[J].Metal Mine，2016，45（8）：54-57.
4 王泽伟，彭康，徐欣，等.胶结充填体下顶底柱进路开采参数优选[J]. 矿冶工程，2014，4（4）：11-15.
WangZewei，PengKang，XuXin，et al.Parameter optimization for pillars robbing under cemented filling body [J]. Mining and Metallurgical Engineering，2014，4（4）：11-15.
5 唐俊智，王江波，林洪勇.人工假底假巷在中薄脉金矿中的应用[J]. 黄金科学技术，2008，16（3）：45-48.
TangJunzhi，WangJiangbo，LinHongyong. Application of artificial concrete-bottom and concrete-lane in the thin vein of gold mine[J].Gold Science and Technology，2008，16（3）：45-48.
6 马明辉，朱明德，陈自辉，等.三山岛金矿无架腿支护技术研究与应用[J].黄金科学技术，2017，25（5）：67-72.
MaMinghui，ZhuMingde，ChenZihui，et al.Research and application of support technology without legs in Sanshandao gold mine [J]. Gold Science and Technology，2017，25（5）：67-72.
7 陈玉山，王立君，尹剑飞，等.无轨机械化盘区点柱式充填采矿法实践[J].黄金科学技术，2002，10（4）：7-12.
ChenYushan，WangLijun，YinJianfei，et al.The practice of mining method for trackless mechanisation panel pillar filling[J]. Gold Science and Technology，2002，10（4）：7-12.
8 高谦.地下大跨度采场围岩突变失稳风险预测[J]. 岩土工程学报，2000，22（5）：523-526.
GaoQian.Instability forecast and risk evaluation of the surrounding rock masses for a large space stope [J]. Chinese Journal of Geotechnical Engineering，2000，22（5）：523-526.
9 TesarikD R，SeymourJ B，YanskeT R.Long-term stability of a backfilled room-and-pillar test section at the Buick Mine，Missouri，USA [J]. International Journal of Rock Mechanics and Mining Sciences，2008，46（7）：1182-1196.
10 WangX B，YangX B，ZhangZ H，et a1.Dynamic analysis of fault rock burst based on gradient-dependent plasticity and energy criterion[J].Journal of University of Science and Technology Beijing，2004，11（1）：5-9.
11 彭康，李夕兵，彭述权，等.基于响应面法的海下框架式采场结构优化选择[J].中南大学学报（自然科学版），2011，42（8）：2417-2422.
PengKang，LiXibing，PengShuquan，et al.Optimization of frame stope structure parameters based on response surface method in under-sea mining[J].Journal of Central South University（Science and Technology），2011，42（8）：2417-2422.
12 O’HearnB，SwanG.The use of models in sill mat design at Falconbridge[C]//Innovations in Mining Backfill Technology：Proceedings of the 4th International Symposium on Mining with Backfill.Brookfield，USA:AA Balkema Publishers,1989：139-146.
13 顾伟，张立亚，谭志祥，等.基于弹性薄板模型的开放式充填顶板稳定性研究[J].采矿与安全工程学报，2013，30（6）：886-891.
GuWei，ZhangLiya，TanZhixiang，et al.Study on roof stability of open backfilling based on elastic plate model [J]. Journal of Mining & Safety Engineering，2013，30（6）：886-891.
14 范文录，李夕兵，周子龙.基于可靠度理论的钢筋混凝土假顶强度确定与配筋设计研究[J].矿冶工程，2013，33（4）：30-35.
FanWenlu，LiXibing，ZhouZilong.Strength determination for reinforced concrete false roof and reinforcement design based on reliability theory[J].Mining and Metallurgical Engineering，2013，33（4）：30-35.
15 尚雪义，李夕兵，彭康，等.基于安全系数和可靠度的极破碎矿体进路优化[J].中南大学学报（自然科学版），2016，47（7）：2390-2397.
ShangXueyi，LiXibing，PengKang，et al.Optimization of drift in extremely fractured ore-body based on safety coefficient and reliability analysis [J]. Journal of Central South University（Science and Technology），2016，47（7）：2390-2397.
16 李夕兵，范文录，胡国宏.急倾斜破碎矿体采矿方法改进与顶板再造设计[J].科技导报，2012，30（13）：44-48.
LiXibing，FanWenlu，HuGuohong.Improvement of steep and fractured ore-body mining method and design of re-construction of sub-top[J].Science and Technology Review，2012，30（13）：44-48.
17 中华人民共和国建设部.建筑结构可靠度设计统一标准：GB50068-2018[S].北京：中国建筑工业出版社，2018.
People's Republic of China Ministry of Consturction.Uniform Standard for reliability of building structures:GB50068-2018[S].Beijing:China Building Industry Press,2018.
18 HughesP，PakalnisR，CaceresC，et al.Numerical modeling of paste sills in underhand cut & fill stopes[C]//Third International Seminar on Deep and High Stress Mining.Quebec：Canadian Institute of Mining，Metallurgy and Petroleum，2006：1-10.
19 李夕兵，刘志祥，彭康，等.金属矿滨海基岩开采岩石力学理论与实践[J].岩石力学与工程学报，2010，29（10）：1945-1953.
LiXibing，LiuZhixiang，PengKang，et al.Theory and practice of rock mechanics related to exploitation of undersea metal mine [J].Chinese Journal of Rock Mechanics and Engineering，2010，29（10）：1945-1953.
20 PengK，YinX Y，YinG Z，et al.Galerkin solution of Winkler foundation-based irregular Kirchhoff plate model and its application in crown pillar optimization[J].Journal of Central South University，2016，23（5）：1253-1263.
21 MatsuiT，SanK C.Finite element slope stability analysis by sheer strength reduction technique [J].Soils and Foundations，1992，32（1）：59-70.
[1] Jun TIAN, Jianpo LIU, Yong YANG, Changyin ZHANG. Study on the Failure Law of Backfill Induced by Blasting Disturbance During Cut and Fill Mining Process [J]. Gold Science and Technology, 2019, 27(5): 687-695.
[2] Shijiao YANG,Zhihui WANG. Numerical Simulation on Stability of Shallow-buried Goaf Group with Overlying Highway [J]. Gold Science and Technology, 2019, 27(4): 505-512.
[3] Rui LIANG,Ruili YU,Wenhai ZHOU,Xiaobin HUANG,Jianyong WANG,Zhengyu XIONG. Application of Air Interval Charge Blasting Model in Mining Room [J]. Gold Science and Technology, 2019, 27(3): 358-367.
[4] Shikang QIN,Qingfa CHEN,Tingchang YIN. Connotation Differences and Research Progress of the Freeze-Thaw Damages of Rock and Rock Mass [J]. Gold Science and Technology, 2019, 27(3): 385-397.
[5] Feng LIU,Zhaokun WANG,Fengshan MA,Bo WANG,Jianbo WANG,Chunlei DONG. Current Situation and Prospect of Destressing Techniques in Deep Mine [J]. Gold Science and Technology, 2019, 27(3): 425-432.
[6] Chun WANG,Cheng WANG,Zuqiang XIONG,Luping CHENG,Huaibin WANG. Deformation Characteristics of the Surrounding Rock in Deep Mining Roadway Under Dynamic Disturbance [J]. Gold Science and Technology, 2019, 27(2): 232-240.
[7] Chuanfeng FANG,Jinmiao WANG,Shanbing LI,Mingtao JIA. Numerical Simulation Research of Natural Caving Method Based on PFC2D-DFN [J]. Gold Science and Technology, 2019, 27(2): 189-198.
[8] Nao LV,Haibo WANG. Numerical Simulation of Collapse Disaster Before and After Weakening of Thick and Hard Roof [J]. Gold Science and Technology, 2019, 27(2): 257-264.
[9] Conglu WANG,Tong LI. Analysis of Influence of Deep Mine’s Linear Heat Source on Effective Ventilation Based on Ventsim Software [J]. Gold Science and Technology, 2019, 27(2): 271-277.
[10] Xiang LI,Zhen HUAI,Xibing LI,Zhuoyao ZHANG. Study on Fracture Characteristics and Mechanical Properties of Brittle Rock Based on Crack Propagation Model [J]. Gold Science and Technology, 2019, 27(1): 41-51.
[11] Chong CHEN,Xibing LI,Fan FENG. Numerical Study on Damage Zones of the Induced Roadway Surrounding Rock [J]. Gold Science and Technology, 2018, 26(6): 771-779.
[12] Liansheng LIU,Qingliang ZHONG,Lei YAN,Wen ZHONG,Longhua LIANG. Measurement of Sound Waves to Study Cumulative Damage Effect on Saturated Rock Under Frequent Production Blast Loading [J]. Gold Science and Technology, 2018, 26(6): 750-760.
[13] Xiushan QIN,Hui CAO,Ye YUAN,Zhijie ZHENG. Method for Repairing Collapse of Orepass Wall Based on Double-Controlled Tension Cable Bundles [J]. Gold Science and Technology, 2018, 26(6): 744-749.
[14] Bo PENG. Numerical Simulation Study of Seepage Stability of Mudstone Slope with Dif-ferent Rainfall Types Coupled with Sudden Drop of Reservoir Water Level [J]. Gold Science and Technology, 2018, 26(5): 647-655.
[15] Guang LI,Fengshan MA,Gang LIU,Jie GUO,Huigao GUO,Yongyuan KOU. Study on Supporting Parametric Optimizing Design and Evaluate Supporting Effect of Deep Roadway in Jinchuan Mine [J]. Gold Science and Technology, 2018, 26(5): 605-614.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] CUI Ting-Jun, DAI Ke-Sai, PENG Yong, FU Xing. Discussion on the Geological Characteristics and Metallogenic Regularity of the  Southern Edge of Qaidam Basin Gold Metallogenic Belt in Qinghai Province[J]. J4, 2010, 18(3): 63 -67 .
[2] YANG Meng-Rong, MAO Chang-Xian. Uncertainty Evaluation of Arsenic and Antimony in Chemical Prospecting Sa-mple by Atomic Fluorescence Spectrometry[J]. J4, 2010, 18(3): 68 -71 .
[3] JIANG Qi, WANG Rong-Chao. [J]. J4, 2010, 18(4): 37 -40 .
[4] CHEN Hua-Dun. [J]. J4, 2010, 18(4): 50 -53 .
[5] YI Cun-Chang, CANG En-Guang. [J]. J4, 2010, 18(4): 58 -61 .
[6] LENG Han-Song, DENG Yao-Ceng, XU Hua-Long, LIU Chao, WANG Zhuo. [J]. J4, 2010, 18(4): 65 -67 .
[7] HUANG Jian-Jun, LI Tian-En, FAN Gong-Ke. Discussion on Geological Setting of Metallogenic and Prospecting Potentiality of Daxinganling Region[J]. J4, 2010, 18(6): 13 -17 .
[8] BAI Bi-Xin, WANG Shan-Gong, AN Zhi-Hai. Research and Application of Underground Mining Exploiting 3D Visualization System in Xinhui Gold Mine[J]. J4, 2011, 19(1): 55 -57 .
[9] KANG Meng，MA Meng-Hao. Application Research on Electrogeochemical Method for Regional Exploration[J]. J4, 2008, 16(1): 1 -6 .
[10] XIE Guiming. Thought of Concern ingM in ing Right Va lue andM in ing Right Sun of Money[J]. J4, 2008, 16(1): 58 -61 .

©2018 Gold Science and Technology　

Telephone：0931-8277791　

E-mail: hjkx@lzb.ac.cn Postcode：730000　

Powered by Beijing Magtech Co. Ltd

陇ICP备17001318号-1