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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (6): 729-735.doi: 10.11872/j.issn.1005-2518.2018.06.729

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Reliability Evaluation of Pillars System Based on Domino Failure Effect

Zilong ZHOU(),Yifan WANG*(),Changtao KE   

  1. 1. School Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
  • Received:2017-07-12 Revised:2017-11-08 Online:2018-12-31 Published:2019-01-24
  • Contact: Yifan WANG E-mail:zlzhou@csu.edu.cn;351375557@qq.com

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Abstract:

The residual goafs after mining operations is a great threaten to underground work and surface building safe.Stability assessment on goafs system helps to guide normal production and prevent disasters.According to pillars’ domino effect，multiple pillars system was constructed，based on which plliars’ strength was calculated and the limitation state equation was proposed.The system’s stability under criteria with different safety factors was estimated by Monte-Carlo simulation method. In a chromite mine，failure probability of multiple pillars system was much higher than failure criteria，which corresponds to the realistic failure.The stability of pillars system was greatly influenced by both pillar bearing capacity and pillar number.

Key words: pillar group, reliability, system stability assessment, domino-type failure, bearing capacity of pillars, failure probability, goaf

CLC Number: 

  • TD32

Fig.1

Plane graph of goaf"

Fig.2

Sectional graph of goaf"

Fig.3

Schematic diagram of parallel pillar group system"

Fig.4

Flow chart of system failure probability calculation by Monte-Carlo simulation"

Fig.5

Pillars distribution in the mine[14] "

Table 1

Basic parameters of pillars in the mine 14 "

矿柱编号 矿柱几何结构 矿柱岩石强度/MPa 矿柱强度/MPa 矿柱承载能力/( × 103kN）
面积/m2 宽度/m 高度/m 体积/m3
2 63 7.9 12 756 14.98 19.1 1 203.3
3 36 6.5 12 432 14.98 19.8 712.8
4 36 6.3 12 432 14.98 19.8 712.8
5 19 4.5 12 228 14.98 20.7 393.3
6 42 7 12 504 14.98 19.6 823.2
8 18 4.2 12 216 14.98 20.8 374.4
10 166 9.2 12 1 992 14.98 17.9 2 971.4
12 108 10.8 12 1 296 14.98 18.5 1 998
13 50 7.7 12 600 14.98 19.4 970
14 213 11.7 12 2 556 14.98 17.7 3 770.1
15 30 6 12 360 14.98 20.1 603
17 10 3.3 12 120 14.98 21.6 216
18 40 6.7 12 480 14.98 19.7 788
19 15 4 12 180 14.98 21 315
20 35 6.4 12 420 14.98 19.9 696.5
21 100 8 12 1 200 14.98 18.5 1 850
22 86 9.6 12 1 032 14.98 18.7 1 608.2
23 130 11.8 12 1 560 14.98 18.3 2 379
24 170 10.5 12 2 040 14.98 17.9 3 043

Table 2

Basic parameters in the mine"

参数 数值 参数 数值
岩石密度/（kg ? m-3） 3 800 矿柱数量 19
埋深/m 100 最小矿柱承载力/ ( × 103kPa) 216
采空区投影面积/m2 3 106 最大矿柱承载力/ ( × 103kPa) 3 770.1

Fig.6

Probability distribution of bearing capacity of pillars"

Fig.7

Effect of bearing capacity distribution of pillars on system failure probability"

Fig.8

Effect of mean value of pillars bearing capacity on system failure probability"

Fig.9

Effect of pillars number on system failure probability"

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