采矿与安全工程学报 ›› 2016, Vol. 33 ›› Issue (3): 481-485.

• 论文 • 上一篇    下一篇

沿空掘巷小煤柱变形分析与中性面稳定性控制技术

  

  1. 1.中国矿业大学矿业工程学院,深部煤炭资源开采教育部重点实验室,江苏 徐州 221116; 2.中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏 徐州 221116; 3.大屯煤电(集团)有限责任公司姚桥煤矿,江苏 徐州 221611
  • 收稿日期:2014-12-24 出版日期:2016-05-15 发布日期:2016-06-03
  • 作者简介:许兴亮(1976—),男,山东省宁阳县人,博士,副教授,博士生导师,主要从事煤矿巷道围岩控制方面的研究。
  • 基金资助:

    国家自然科学基金项目(51474207);中央高校基本科研业务费专项资金项目(2011QNA11);江苏高校优势学科建设工程资助项目

Deformation analysis and neutral plane stability control technology of small coal pillar with gob-side entry

  • Received:2014-12-24 Online:2016-05-15 Published:2016-06-03

摘要: 依据小煤柱沿空掘巷条件下采场侧方煤体支承压力分布特征,通过数值计算和原位实测方法研究发现小煤柱内部存在不变形或变形极小的中性面区域。随煤柱尺寸增加,中性面区域的宽度逐渐增大,但其占煤柱宽度比例增速降低并逐渐趋于稳定。研究发现锚杆支护强度可以显著增大煤柱内中性面极限承载区的宽度与承载能力,通过采用高强度锚杆支护的方法实现了全塑性区小煤柱稳定性控制,并将研究结果成功地应用于工程实践。

关键词: 沿空掘巷, 小煤柱, 中性面, 数值模拟

Abstract: According to the abutment pressure distribution of stope lateral coal under the condition of small coal pillar with gob-side entry, some neutral plane areas where the deformation of coal is small in coal pillar have been studied through numerical calculation and in-situ measurements. As the size of coal pillar increases, the width of neutral plane area increases. However, the speeding-up of neutral plane area occupying the width of coal pillar decreases and becomes stable. The research has found that the intensity of bolt support can noticeably increase the width of maximum bearing and bearing ability for neutral plane area. The stability control technology of small coal pillar with full plastic zone was put forward. And the research results were successfully applied to engineering practice.

Key words: gob-side entry driving, small coal pillar, neutral plane, numerical simulation