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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (3): 315-323.doi: 10.11872/j.issn.1005-2518.2022.03.176

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Numerical Analysis of Stability of Large Complex Goaf Group and Prediction of Hidden Danger Area

Jielin LI(),Le GAO,Chengye YANG,Keping ZHOU   

  1. School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
  • Received:2021-11-24 Revised:2021-02-27 Online:2022-06-30 Published:2022-09-14

Abstract:

The governance of large and complex goaf groups is a long-term process.Aiming at the mined-out area groups at different control stages,the formulation of scientific and reasonable control plans plays a vital role in the safety of mine production.After years of mining in an underground mine,a large number of mined-out areas have been formed.Due to the long existence of the mined-out areas,the upper and lower middle sections of some mined-out areas and adjacent panels have caving through,forming a large and complex group of mined-out areas,which seriously threatens the safe production of the mine.At present,numerical simulation is one of the effective methods to analyze the stability of the goaf.However,in the process of numerical analysis,for complex and large goaf groups,there is a direct conversion of the three-dimensional laser point cloud data into a computable grid model.Difficulties such as huge number of grids,long calculation time,inability to converge or even calculation.In order to obtain a calculable high-precision goaf group model,first use 3D laser scanning to scan and detect the goaf group to obtain an accurate 3D model of the goaf.Due to the large amount of point cloud data from the 3D laser scanning,it is passed through Geomagic-Midas Coupling modeling,processing the model under the condition of ensuring that the basic shape of the model is not distorted,and obtaining a computable numerical model of the goaf group.Then use FLAC3D to perform numerical calculations on the goaf group,according to the stress cloud diagram,displacement cloud diagram and plasticity area distribution map,preliminary analysis of the entire goaf group.And at the same time,according to the displacement instability criterion,the roof hidden danger areas of No.1 large goaf and No.3 medium goaf are determined.The simulation calculation results were compared with the site caving detection results verifies the reliability of the numerical simulation method.Due to the occurrence of local caving,the roof stress of the goaf group is redistributed,so the secondary numerical simulation of the goaf group after the caving was carried out,and the scope of the hidden danger area was predicted.The research results provide a scientific basis for the identification of safety hazards and the formulation of control measures in the mine goaf.

Key words: large-scale goaf group, 3D laser scanning, unmanned aerial vehicle, numerical calculation, hidden danger treatment

CLC Number: 

  • TD325.3

Table 1

Statistics and classification of goaf"

采空区编号体积/m3类型采空区编号体积/m3类型
1672 843大型143 744

小型

小型

小型

小型

小型

小型

小型

小型

小型

小型

小型

小型

2234 525

中型

中型

153 539
3212 618163 332
461 840

小型

小型

小型

小型

小型

小型

小型

小型

小型

小型

173 077
558 802182 863
657 808192 741
751 875202 712
846 410212 592
927 612222 584
1024 308232 563
1118 301242 496
125 529252 073
134 365合计1 511 152

Fig.1

Three-dimensional solid model of goaf group"

Fig.2

Initial model of goaf"

Fig.3

Optimization of triangular slice"

Fig.4

Treatment results of goaf model"

Table 2

Mechanical parameters of rock mass"

岩体类别密度/(kg·m-3抗拉强度/MPa内聚力/MPa内摩擦角/(°)剪切模量/GPa体积模量/GPa
变钠质熔岩2.930.2302.67950.294.6376.449
磁铁矿3.050.9713.54547.156.0839.237

Fig.5

Stability analysis cloud diagram of goaf"

Table 3

Roof displacement instability criterion of large goaf group"

顶板下沉位移顶板稳定性
<10 mm基本无影响
10~40 mm顶板相对稳定
40~75 mm顶板极易破坏
>75 mm顶板破坏

Fig.6

Hidden roof area in No.1 and No.3 goaf"

Fig.7

Detection results of falling range"

Fig.8

Goaf group model after caving"

Fig.9

Stability analysis cloud diagram of goaf after falling"

Fig.10

Hidden danger area of goaf roof"

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