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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第10期    总第290期    2018年10月

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文章编号:1672-7207(2018)10-2545-08
采空区群残采充填方案稳定性分析
周智勇1,姜立春2,王国伟2,韩章程1

(1. 中南大学 资源与安全工程学院,湖南 长沙,410083;
2. 华南理工大学 安全科学与工程研究所,广东 广州,510640
)

摘 要: 为研究残采条件下的采空区群失稳响应控制,借助采空区群动力响应模型与类框架结构模型,从动力响应及应力响应这2个方面分析采空区群失稳控制效果。以某大型金属矿山4个中段12个单元采空区组成的采空区群为例,研究残矿回采工程中完全充填(方案I)与不完全充填(方案II)下采空区群的失稳响应控制。研究结果表明:方案I经充填处理后,拉应力分布范围整体上移,主要集聚在1 570 m中段顶板处,1 420 m中段底板处拉应力集聚现象基本消除;方案II经充填处理后,其拉应力集聚被缓解,保持在稳定范围之内;方案I经充填处理后,采空区群各中段顶板位移及速度响应大幅度下降,达到较好的充填效果;方案II经充填处理后,采空区群各中段顶板位移及速度响应也明显降低,且其降幅与方案I的降幅基本持平;空区群采用方案II充填后,所形成新的采空区群系统具有较强稳定性,考虑到时间成本及资金等情况,采取方案II对关键空区进行初步充填处理更具有可行性。

 

关键字: 采空区群;动力响应;应力响应;失稳控制;充填方案

Stability analysis on backfilling schemes of goaf group under condition of residual mining
ZHOU Zhiyong1, JIANG Lichun2, WANG Guowei2, HAN Zhangcheng1

1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. Institute of Safety Science and Engineering, South China University of Technology, Guangzhou 510640, China

Abstract:To study the unstable response control of goaf group under the condition of residual mining, the effect of the unstable control of goaf group was investigated from dynamic response and stress response using the dynamic response model and the analogous frame structure model. Taking the goaf group composed of 12 unit goafs of 4 middle sections in a large metal mine as research object, the unstable response control of goaf group in the residual mining engineering was studied under complete backfilling scheme(scheme I) and incomplete backfilling scheme(scheme II). The results show that the tensile stress distribution range is shifted up after the treatment of complete backfilling, with the main concentration being at the roof of 1 570 m middle section, and the phenomenon of tensile stress concentration is basically eliminated at the floor of 1 420 m middle section. Under the incomplete backfilling scheme, the tensile stress concentration can be relieved and kept within a stable range. The displacement and velocity response of each middle section roof of the goaf group reduce greatly and have good effect under complete backfilling scheme. After the treatment of incomplete backfilling, the displacement and velocity response of each middle section roof of the goaf group reduce significantly, and the decrease is basically the same as that of scheme I. The new goaf group system formed by the incomplete backfilling scheme has good stability. Taking into account the time cost and the fund, it is more feasible to adopt a preliminary backfilling scheme for the key goaf.

 

Key words: goaf group; dynamic response; stress response; unstable control; backfilling scheme

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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