基于复合岩体弹性模量优化底板注浆加固深度  

Optimization of Floor Grouting Reinforcement Depth Based on Elastic Modulus of Composite Rock Mass

作　　者：许成富 苗葳 张博淞 李磊 王立彬 XU Chengfu;MIAO Wei;ZHANG Bosong;LI Lei;WANG Libin(Jiulishan Coal Mine of Jiaozuo Coal Industry Group,Jiaozuo,Henan 454002,China;School of Energy,China University of Mining Technology-Beijing,Beijing 100083,China;Jiaozuo Coal Industry(Group)Co.,Ltd.,Jiaozuo,Henan 454002,China)

机构地区：[1]焦作煤业(集团)有限责任公司九里山矿,河南焦作市454002 [2]中国矿业大学(北京)能源学院,北京100083 [3]焦作煤业(集团)有限责任公司,河南焦作市454002

出　　处：《矿业研究与开发》2024年第4期138-143,共6页Mining Research and Development

基　　金：国家自然科学基金重点项目(51934008)。

摘　　要：以焦作矿区底板注浆加固改造工作面为研究背景,采用超声波法实测工作面底板注浆前后岩体弹性模量,定量分析了注浆深度范围内复合岩层整体强度变化特征,研究了底板注浆加固对工作面复合岩层底板破坏带的影响。结果表明:经注浆加固后,底板泥岩、砂质泥岩、砂岩、L9灰岩、L8灰岩的弹性模量分别增长了640%~852%、241%~641%、221%~247%、176%、40%~159%,底板破坏深度由30.59 m降低至11.7 m,减少了约62%;随着注浆加固后底板破坏深度减小,绝对隔水层厚度随之增加,对工作面底板注浆加固深度进行优化,采用双层立体布孔方式,在保证底板注浆效果的同时,降低3140 m工程总钻探进尺,并较原计划节约了35 d施工工期。Taking the floor grouting reinforcement and renovation working face in Jiaozuo mining area as the research background,the elastic modulus of rock mass before and after floor grouting was measured by ultrasonic method,the change characteristics of the overall strength of composite rock strata within the range of grouting depth were obtained quantitatively,and the influence of floor grouting reinforcement on the failure zone of composite rock floor was analyzed.The research shows that the elastic modulus increases respectively after grouting reinforcement.Mudstone increases by 640%-852%,sandy mudstone increases by 241%-641%,sandstone increases by 221%-247%,L9 limestone increases by 176%and L8 limestone increases by 40%-159%.The failure depth of floor decreases by about 62%,which is from 30.59 m to 11.7 m.As the failure depth of the floor decreases after grouting reinforcement,the thickness of the absolute waterproof layer increases.The depth of grouting reinforcement for the floor of working face was optimized by adopting a double-layer three-dimensional hole layout method.While ensuring the grouting effect of the floor,the total drilling depth of the 3140 m project was reduced,and the construction period was saved by 35 days compared to the original plan.

关 键 词：大水矿床开采 弹性模量 底板注浆加固 复合岩体强度 超声波法 

分 类 号：TD745[矿业工程—矿井通风与安全]