摘要
为解决垮落带直覆下煤层破碎顶板加固问题,以许疃煤矿7228工作面为工程背景,提出地面注浆加固方案,从浆液选择、地面钻探技术、注浆工艺和注浆效果评价4个方面研究其施工工艺。通过设计浆液静置试验、浆液析水试验和浆液配比试验确定了水灰比1∶1、固相比2∶8的水泥-粉煤灰浆液配比方案;在钻探技术上设计了二开结构钻孔和二次掘进方案保证了成孔质量,使浆液顺利到达目的层;通过地面钻探、井下物探和井下回采实揭72煤层顶板验证了注浆效果。经过地面注浆加固,72煤层顶板强度和完整性得到了显著加强,解决了7228工作面里段回采所面临的工程地质问题,实现了7228工作面煤层的高效回采。
In order to solve the problem of strengthening the broken roof of the coal seam under the direct cover of the caving zone, taking the 7228 working face of Xutuan Coal Mine as the engineering background, the paper proposes the ground grouting reinforcement plan, and studies its construction technology from four aspects of slurry selection, grouting technology, ground drilling technology and grouting effect evaluation. The cement coal ash slurry proportioning schemes with water cement ratio of 1 ∶1 and solid phase ratio of 2 ∶8 have been determined through the slurry static test, slurry water separation test and slurry proportioning test;the secondary structure drilling and secondary tunneling scheme have been designed in the drilling technology to ensure the quality of drilling and make the slurry reach the target layer smoothly;the roof of coal seam 72 has been exposed through surface drilling, underground geophysical exploration and underground mining, and the grouting effect is verified. Through the ground grouting reinforcement, the strength and integrity of the 72 coal seam roof have been significantly strengthened, and the engineering geological problems faced by the 7228 working face are solved, and the high-efficiency mining of 7228 working face is realized.
作者
孟祥帅
鲁海峰
年宾
于玉
MENG Xiangshuai;LU Haifeng;NIAN Bin;YU Yu(School of Earth and Environment,Anhui University of Science&Technology,Huainan 232001.China;Chexplore Resource Exploration Technology Co.,Ltd.,Huaibei 235000,China)
出处
《煤矿安全》
CAS
北大核心
2020年第8期90-95,共6页
Safety in Coal Mines
关键词
垮落带
破碎顶板
地面注浆
水泥-粉煤灰浆液
二开结构
顶板加固
caving zone
broken roof
ground grouting
cement coal ash slurry
two-open structure
roof reinforcement