煤炭科技2024，Vol.45Issue(3)：41-48,8.DOI:10.19896/j.cnki.mtkj.2024.03.008
厚煤层综放沿空留巷底鼓发生机理及其控制技术研究
Research on mechanism of floor heave occurrence and its control technology in thick coal seam comprehensive gob-side entry retaining
胡晓晗 1刘尚明 2解小光 2孙艳清 3刘森虎1
作者信息
- 1. 山东科技大学,山东青岛 266590
- 2. 枣庄矿业集团新安煤业有限公司,山东微山 277600
- 3. 枣庄矿业(集团)有限责任公司滨湖煤矿,山东滕州 277000
- 折叠
摘要
Abstract
To address the problem of floor heave often occurs in the gob-side entry retaining of fully-mechanized caving in thick coal seams,this paper took the N2301 roadway of Gucheng Coal Mine as the engineering background and used a combination of field re-search,theoretical analysis and numerical simulation to study the mechanism of the occurrence of floor heave and its control technology.Field investigation found that the roadway exhibited obvious characteristics of squeeze flow and floor heave.A deep high stress roadway floor heave mechanical model was constructed,and the mechanism of floor heave occurrence was analyzed in combination with theory.The results showed that the higher the degree of stress concentration in the roadway,the greater the depth of damage to the roadway floor.According to the field situation,the method of grouting reinforcement was proposed to control the floor heave,and COMSOL numer-ical simulation software was used to study the range of bottom slurry pressure distribution under different grouting parameters,and the grouting pressure of 3 MPa,grouting time of 6 min and the row distance between anchor cables of 1000mm × 1000mm were determined for N2301 roadway.Engineering applications showed that the maximum floor heave of the roadway was 15 mm,and the maximum separa-tion value at a depth of 6 m in the surrounding rock was 23 mm.The optimized grouting parameters were applied in the advance support-ing of N2301 roadway in Gucheng Coal Mine,and good engineering results were achieved,and the research results have important refer-ence value for the management of bottom drum and design of grouting parameters in similar conditions.关键词
底鼓/沿空留巷/厚煤层/注浆加固/COMSOL数值模拟Key words
floor heave/gob-side entry retaining/thick coal seam/grouting reinforcement/COMSOL numerical simulation分类
矿山工程引用本文复制引用
胡晓晗,刘尚明,解小光,孙艳清,刘森虎..厚煤层综放沿空留巷底鼓发生机理及其控制技术研究[J].煤炭科技,2024,45(3):41-48,8.
