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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (3): 324-332.doi: 10.11872/j.issn.1005-2518.2022.03.105

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Stability Numerical Analysis and Safety Classification Evaluation of Complex Goaf Group

Keping ZHOU1(),Lixiong CAO1,Jielin LI1(),Wei ZHANG2,Chengye YANG1,Xiaoping ZHANG3,Le GAO1   

  1. 1.School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China
    2.Yuxi Dahongshan Mining Co. , Ltd. , Yuxi 653405, Yunnan, China
    3.Tianhe Daoyun(Beijing) Technology Co. , Ltd. , Beijing 100176, China
  • Received:2021-08-12 Revised:2022-04-05 Online:2022-06-30 Published:2022-09-14
  • Contact: Jielin LI E-mail:Kpzhou@vip.163.com;lijielin@163.com

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Abstract:

Goaf has become a major hidden danger affecting mine safety production.In order to accurately analyze the stability of complex goaf group and strengthen the safety control of goaf group in mine，based on the fine detection data of goaf group in a mine，a coupling modeling and numerical simulation analysis method of Geomagic，Midas GTS and FLAC3D was adopted to analyze the stability of complex goaf group.At the same time，the safety classification evaluation system of complex goaf group was established based on 16 indicators such as goaf type，rock compressive strength and exposed area，and the safety classification evaluation of complex goaf group was carried out.The results show that there are caving hazards in the hanging wall and southeastern roof of large ore body goaf.The ‘springboard’ rockmass in the northwest of the panel-5 will be deformed greatly in the process of residual ore mining.There is great stress concentration in the inter-pillar separated by each goaf in the main mining area.Combined with the safety classification evaluation results of goaf，the treatment measures of each goaf are proposed.The research results provide reference for the stability analysis and safety classification evaluation of mined-out areas in similar mines.

Key words: goaf group, coupling modeling, stability analysis, safety classification evaluation, risk assessment, matter-element extension evaluation model

CLC Number: 

  • TD325.3

Fig.1

Construction of 3D solid model of goaf and roadway by 3D laser scanning technology"

Fig.2

Delineation of spatial area of actual-measured goaf"

Fig.3

Triangulation plate homogenization"

Fig.4

Numerical model construction"

Table 1

Physical and mechanical parameters of rock mass"

岩石类别物理力学指标
弹性模量/GPa泊松比内聚力/MPa内摩擦角/（°）单轴抗拉强度/MPa密度/（kg·m-3）
围岩11.2210.212.67950.290.352.93
矿体14.9640.233.54547.150.413.05

Fig.5

Numerical analysis results of goaf stability"

Fig.6

Stress appearance in the 790 m level"

Fig.7

Principle of goaf safety grading evaluation"

Table 2

Influence index of goaf stability"

指标类型指标名称指标描述
定性指标采空区类型采矿方法、形成与处理时间、存在形态
地质构造断层、褶皱、裂隙分布特征
岩体结构结构面和结构体形状、规模、性质
围岩支护围岩支护方式
顶板特征顶板形状、支护措施
地表特征地表变形、塌陷沉降、防洪、围岩垮落及安全防护
水文因素空区内水文地质特征
相邻空区分布周边采空区群或独立采空区分布
工程布置运输、采准、切割巷道及采场布置
定量指标采空区规模独立采空区体积
埋深承压围岩之间的水平距离
高跨比跨度与高度比值
暴露面积空区水平面投影面积
矿柱安全系数矿柱稳定程度
岩石抗压强度岩石坚硬程度
岩石质量标准岩体被各种结构面切割的程度

Table 3

Safety rating of goaf"

危险度等级治理方案
一级采用充填法处理采空区，主要为废石充填、 移动式泵送充填、废石胶结充填
采用崩落法处理，如果围岩较为稳固， 视情况强制崩落
二级采用崩落法处理
采用充填法处理
三级封闭处理采空区
加固、支撑顶板
构筑阻波墙，减少冲击波危害
四级设置警示线、封闭采空区

Table 4

Goaf classification summary"

序号采空区编号分级处理方式（建议）
1730 m中段一盘区采空区三级封闭、后期视情况充填
2775 m中段零盘区采空区四级封闭、后期视情况充填
3775 m中段一盘区采空区三级充填
4790 m低品位矿体采空区群（7个）四级封闭、后期视情况充填
5805 m中段一盘区采空区三级充填
6805 m低品位矿体采空区群（6个）四级封闭、后期视情况充填
7835 m中段一盘区采空区三级充填
8835 m中段二盘区采空区三级充填
9大矿体采空区一级构筑阻波墙后充填
10五盘区采空区二级在710 m中段底部出矿口构筑阻波墙后充填
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