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Gold Science and Technology ›› 2020, Vol. 28 ›› Issue (4): 550-557.doi: 10.11872/j.issn.1005-2518.2020.04.030

• Mining Technology and Mine Management • Previous Articles     Next Articles

Study on the Optimization of Stope Structure Parameters in the Large-scale Backfilling Mining of Rangjialong Silver Mine

Huaibin SU1(),Qinli ZHANG1(),Deming ZHANG2,Changgen ZENG3,Xiaojiang ZHU3   

  1. 1.School of Resources and Safety Engineering，Central South University，Changsha 410000，Hunan，China
    2.Hunan Zhongda Design Institute Co. , Ltd. ，Changsha 410000，Hunan，China
    3.Hunan Pengyuan Hongda Mining Co. , Ltd. ，Hengyang 421000，Hunan，China
  • Received:2020-01-06 Revised:2020-05-11 Online:2020-08-31 Published:2020-08-27
  • Contact: Qinli ZHANG E-mail:1291306752@qq.com;zhangqinlicn@126.com

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Abstract:

Rangjialong mine is a continuous mining mine，and a large number of mined-out areas are left over from years of open-field mining，which are prone to caving and collapse，thus inducing large-scale ground pressure activities.A large number of pillars are left in the open field method，and the loss of pillar resources is serious.At the same time，tailings pond design dam crest elevation of 165 m，the current has been discharged to 156 m，tailings pond storage capacity is close to saturation，the mine is facing the dilemma of nowhere to discharge the tailings.In order to solve the above problems，the mine will change the current method to the two-step stope backfilling method，which is urgent to determine the safe and reasonable stope structure parameters，mainly considering stope span.In this study，finite element simulation software was used to establish 5 stope structure models with different spans，with a gradient of 5 m and a span range of 15~35 m.The two-step stoping process is simulated，and the stress distribution and displacement variation of the two step stoping pillar and backfill artificial pillar were obtained，and the ultimate strength of the stope rock (or backfill) was compared，and the stope structure parameters were optimized.According to the results of simulation，the value of the tensile stress of the artificial pillar and backfill in each scheme is less than the allowable tensile stress，the safety coefficient of the tensile stress decreases with the increase of the stope width，and the minimum value is close to 2.0.The roof column and pillar under each simulation scheme are not in a state of instability.When the stope span is between 15 m and 25 m，the simulated compressive stress value of the corresponding model is in the critical state or stable state，the compressive stress safety coefficient is greater than 1.3，and the Y direction displacement is uniform.The simulated compressive stress value of the roof pillar is very close to the allowable value when the stope span is greater than 30 m，the roof column is prone to compressive stress failure.The overall displacement change in the Y direction of the filling artificial pillar under 5 schemes does not exceed 10 mm，which is safe and controllable.In order to ensure the economic benefits of the mine，the reasonable stope span is finally determined to be 20~25 m，the stope width is 40 m and the stage height is 80 m.It can provide theoretical support for the recovery of residual ore resources in mines with similar engineering geological conditions.

Key words: mining method, two-step backfilling of empty space, optimization of stope structure parameters, numerical simulation, ANSYS

CLC Number: 

  • TD853

Table 1

Summary of mechanical parameters data used in simulation"

名称弹性模量Em/GPa抗压强度σm/MPa抗拉强度σt/MPa体重/（kg·m-3）泊松比υ黏结力Cm/MPa内摩擦角φm/（°）
围岩8.19.66.32 7500.190.832
矿体7.36.283.55 5000.251.835
充填体0.121.590.21 9400.240.237

Table 2

Simulation scheme of different stope structure parameters"

模拟序号宽度X/m长度Y/m高度Z/m
1154080
2204080
3254080
4304080
5354080

Fig.1

Numerical model section"

Table 3

Summary of numerical simulation results of each model"

区域模拟序号模拟压应力值/Pa压应力安全系数模拟拉应力值/Pa拉应力安全系数Y方向位移/m
顶柱17.31E+058.592.82E+0512.420.00141
21.04E+066.043.80E+059.220.00213
34.81E+061.311.29E+062.710.00513
45.41E+061.161.49E+062.350.01113
56.31E+061.001.79E+061.960.04313
充填体人工矿柱11.11E+0514.321.87E+0410.670.01644
22.70E+055.894.44E+044.510.01957
34.88E+053.267.54E+042.650.02351
45.53E+052.888.56E+042.340.02565
56.12E+052.609.26E+042.160.02925

Fig.2

Cloud chart of numerical simulation results of stope span 20 m"

Fig.3

Cloud chart of numerical simulation results of stope span 25 m"

Fig.4

Cloud chart of numerical simulation results of stope span 30 m"

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