Scholarlink

<p>How to realize the active pressure relief of thick-hard roofs in different layers has become the focus topic. Based on research background of large-energy microseismic events and strong impact threat of high-level thick-hard roof in Xinjulong Coal Mine, focusing on the core concept of “hazard Control by blasting”, this paper proposes a new pressure relief method for “artificial failing zone” whole-layer presplitting blasting, which is supposed by the core concept of “hazard Control by blasting” and field explosive fracture network monitoring method - “Point-Line-Surface-Body”. The feasibility of this method is verified by physical model test, while the pressure relief effect of 8302 working face is completed by multi-dimensional monitoring data. The specific conclusions are as follows: In the physical model test, the migration law of overlying strata is characterized by “fissure-separation-fracture” process. As an early indicator of rock strata collapse, fissures extend along the strike of coal seam. The expansion of suspended area results in collapse of primary roof, while collapse line extends to deeper rock strata. The primary roof exhibits a wedge-shaped collapse, while the overlying strata display separation. Then, under the action of separation, the high-level thick-hard roof undergoes stage fracture. During working face mining, the microseismic event at energy level of E + 04 was observed to have decreased from 2.3% (before stopping) to 0.7% (after recovery). Additionally, the maximum roadway deformation was found to remain within safety range with a recorded value of 40%. Peak stress decreased significantly by 40% from 12.85&#xa0;MPa to 8.5&#xa0;MPa, and the upward trend of the working resistance was altered (maintained at 18 × 10<sup>3</sup> to 24 × 10<sup>3</sup> KN). The high-level whole-layer pre-splitting blasting achieves the desired pressure relief target of “untie connection, weaken peak, control deformation”. Ultimately, the pressure relief system based on blasting technology is improved by the span of working face and the position of thick-hard roof, which has important theoretical and practical significance for the pressure relief and anti-impact engineering practice of deep resource mining.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

High-level thick-hard Roof Blasting Pressure Relief Mechanism and Experimental Study in Deep Rockburst Mines

  • 期刊论文

  • 发表日期：

    2026年1月4日

查看全文
  • Bingbing Yu,
  • Renshu Yang,
  • Jinjing Zuo,
  • Yuantong Zhang,
  • Bo Wang

摘要

How to realize the active pressure relief of thick-hard roofs in different layers has become the focus topic. Based on research background of large-energy microseismic events and strong impact threat of high-level thick-hard roof in Xinjulong Coal Mine, focusing on the core concept of “hazard Control by blasting”, this paper proposes a new pressure relief method for “artificial failing zone” whole-layer presplitting blasting, which is supposed by the core concept of “hazard Control by blasting” and field explosive fracture network monitoring method - “Point-Line-Surface-Body”. The feasibility of this method is verified by physical model test, while the pressure relief effect of 8302 working face is completed by multi-dimensional monitoring data. The specific conclusions are as follows: In the physical model test, the migration law of overlying strata is characterized by “fissure-separation-fracture” process. As an early indicator of rock strata collapse, fissures extend along the strike of coal seam. The expansion of suspended area results in collapse of primary roof, while collapse line extends to deeper rock strata. The primary roof exhibits a wedge-shaped collapse, while the overlying strata display separation. Then, under the action of separation, the high-level thick-hard roof undergoes stage fracture. During working face mining, the microseismic event at energy level of E + 04 was observed to have decreased from 2.3% (before stopping) to 0.7% (after recovery). Additionally, the maximum roadway deformation was found to remain within safety range with a recorded value of 40%. Peak stress decreased significantly by 40% from 12.85 MPa to 8.5 MPa, and the upward trend of the working resistance was altered (maintained at 18 × 103 to 24 × 103 KN). The high-level whole-layer pre-splitting blasting achieves the desired pressure relief target of “untie connection, weaken peak, control deformation”. Ultimately, the pressure relief system based on blasting technology is improved by the span of working face and the position of thick-hard roof, which has important theoretical and practical significance for the pressure relief and anti-impact engineering practice of deep resource mining.