负煤柱工作面开采对倾向主断面地表沉陷的影响与预测研究
Inclined main section surface subsidence influence and prediction by negative coal pillar face mining
刘润 1乔凯 1祝壮 2王朋飞 2孙中光 3马乐 1张旭 1邬静玉1
作者信息
- 1. 国能包头能源有限责任公司 万利一矿,内蒙古 鄂尔多斯 017000
- 2. 太原理工大学 矿业工程学院,山西 太原 030024
- 3. 中煤科工集团重庆研究院有限公司,重庆 400039
- 折叠
摘要
为了研究负煤柱工作面布置方式下的地表沉陷规律与机理,通过现场实测和数值模拟的方法,研究了负煤柱工作面时空关系对倾向主断面地表沉陷的影响.研究结果表明:负煤柱工作面地表沉陷曲线在三角煤柱侧较直角煤柱侧更为平缓,上覆岩层下沉量增加,垮落带相连,导致地表出现平底区;开采时间间隔越久,地表变形越不均匀,岩层整体所受接续工作面扰动程度越小,变形向首采工作面上方集中,最大下沉值出现点向首采工作面方向偏移,最大下沉量先减小后趋向稳定;基于概率积分法,提出了相应的地表沉陷预测方法,并通过与实测数据对比验证了该预测方法的实用性和可靠性.
Abstract
To study the surface subsidence law and patterns in negative coal pillar face layout,we take on-site measurement and numerical simulation to study the influence of spatiotemporal relationship of negative coal pillar working faces on the subsidence of the inclined main section.The results show that the subsidence curve of the negative coal pillar working face is smoother on the triangular coal pillar side than that on the rectangular coal pillar side,with an increase in subsidence of the overlying strata and connection of the collapse zones,resulting in a flat-bottomed subsidence area on the surface.As the mining interval increases,the surface deformation becomes more uneven,and the disturbance of the continuous working face on the overall strata decreases,deformation concentrating above the initial mining face.The maximum subsidence point shifts towards the direction of the initial mining face,and the maximum point first reduces and then becomes stable.Based on the probability integral method,we propose surface subsidence prediction method,which is validated by comparing with field measurements data,demonstrating the practicality and reliability of this method.
关键词
多工作面/负煤柱/开挖间隔/时空关系/地表沉陷Key words
multiple faces/negative pillar/mining interval/space and time relationship/surface subsidence引用本文复制引用
出版年
2024
NETL
NSTL
万方数据