Similar material simulation of time series system for induced caving of roof in continuous mining under backfill

Abstract

With the help of similar material simulation test, time series system for induced caving of roof in continuous mining under complex backfill in ore body No.92 of Tongkeng Tin Mine was studied. According to the similarity theory, a two-dimensional similar simulation test-bed was constructed. The stress and displacement that change along with the advance of mining were acquired and analyzed automatically by data system. The processes of continuous mining of ore-block in 5 intervals and artificial induced caving of roof were simulated. The results of the test show that ore body remained as safety roof in thickness of 15 m guarantees the safe advance of stoping work face. Caving of safety roof puts in practice at the first two mining intervals when the third interval of continuous mining is finished, and one interval as the safety distance should be kept all the time between stopping and caving. While mining in the last interval, pre-slotting should be implemented first of all, and the roof of the last two mining intervals is caved simultaneously. Only this kind of time series system can be an efficient and safe way for induced caving of roof in continuous mining.

Keywords

continuous mining / induced caving / similar material simulation / safety roof / slotting

References

[1] GaoF., ZhouK.-ping.. Evaluation of the stability of stope roof based on extenics theory [J]. Mining Research and Development, 2005, 25(5): 76-79

[2] YuJ., ZhangA.-lan.. Study on new technique of rapidly following curtain filling [J]. Journal of Central South University of Technology, 2002, 9(2): 118-122

[3] DengJ., GuD.-s., LiX.-b., PengH.-sheng.. Energy method and numerical simulation of critical backfill height in non-pillar continuous mining [J]. Transactions of Nonferrous Metals Society of China, 1999, 9(4): 847-851

[4] WuA.-x., HanB., GuD.-s., HuH.. Progress in research on continuous mining technology of domestic and foreign underground metal mines [J]. Mining and Metallurgical Engineering, 2002, 22(3): 7-10

[5] BrownE. T.Block caving geomechanics [M], 2003, Brisbane, Julius Kruttschnitt Mineral Research Centre: 3-12

[6] GuD.-s., LiX.-bing.Modern mining science and technology for metal mineral resources [M], 2006, Beijing, Metallurgical Industry Press: 68-70

[7] HuJ.-h., ZhpuK.-p., LiX.-b., YangN.-g., SuJ.-hong.. Numerical analysis of application for induced caving roof [J]. Journal of Central South University of Technology, 2005, 12(S1): 146-149

[8] HuJ.-h., ZhouK.-p., GuD.-s., SuJ.-hong.. Analysis of time-variation mechanical characteristics of induced roof caving based on continuous mining [J]. Mining Technology, 2006, 6(3): 157-160

[9] AlfaroM. C., WongR. C. K.. Laboratory studies on fracturing of low-permeability soils [J]. Canadian Geotechnical Journal, 2001, 38(2): 303-315

[10] LiuC.-w., GuoY.-f., YaoJ.-ming.. The development and problems of mining similar simulation experiment technique—Meaning of developing three dimensional mining physical simulation experiment [J]. China Mining Magazine, 2003, 12(8): 6-8

[11] LiZ.-k., LiuH., DaiR.. Application of numerical analysis principles and key technology for high fidelity simulation to 3-D physical model tests for underground caverns [J]. Tunneling and Underground Space Technology, 2005, 20(4): 390-399

[12] LiJ.-p., ZhouC.-b., LiX.-yang.. Similarity simulation of disposal scheme for abandoned stope under the sunken topography [J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(4): 581-586

[13] HazzardJ. F., YoungR. P.. Dynamic modeling of induced seismictiy [J]. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(8): 1365-1376

[14] WangJ.-x., WangJ.-c., DongW.-j., ChenZ.-hui.. Similar simulated experiment for continuous mining and roof dilapidation or ore body underground [J]. Journal of Liaoning Technical University, 2006, 25(4): 172-175

[15] ZhouK.-p., SuJ.-h., GuD.-s., ShiX.-z., XiangR.-jun.. The nonlinear forecasting method of the least security coping thickness when mining under complex backfill [J]. Journal of Central South University: Science and Technology, 2005, 36(6): 1094-1099

[16] DongW.-j., SunZ.-m., WangJ.-c., ChenZ.-hui.. Study of similar material simulated experiment on natural caving of ore body [J]. Mining Technology, 2001, 1(3): 13-15

[17] CuiX.-m., MiaoX.-x., SuD.-g., MaW.-min.. Error analysis in similar material simulation test of the movement of rock strata and surface [J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(12): 1827-1830