工作面基岩风氧化带工程地质特征:以淮南矿区张集煤矿为例  

Engineering Geological Characteristics of the Wind-oxidized Zone of Bedrock in the Working Face:Taking Zhangji Coal Mine in Huainan Mining Area as an Example

作　　者：张子晴 翟晓荣[1,2] 唐明 程浪 ZHANG Zi-qing;ZHAI Xiao-rong;TANG Ming;CHENG Lang(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;Coal Industry Engineering Research Center for Comprehensive Prevention and Control of Mine Water Disaster,Huainan 232001,China;Zhangji Coal Mine,Huainan Coal Mining Group Co.,Ltd.,Huainan 232001,China)

机构地区：[1]安徽理工大学地球与环境学院,淮南232001 [2]矿井水害综合防治煤炭行业工程研究中心,淮南232001 [3]淮南矿业(集团)有限责任公司张集煤矿,淮南232001

出　　处：《科学技术与工程》2024年第28期12086-12094,共9页Science Technology and Engineering

基　　金：矿井水害综合防治煤炭行业工程研究中心开放基金课题(2022-CIERC-05)。

摘　　要：隐伏型煤田浅部工作面回采受其顶板基岩风氧化带影响,风氧化作用影响下,岩体工程地质条件劣化,对工作面顶板管理及水害防治有较大影响。以安徽淮南矿区张集煤矿近松散层1410(3)工作面为例,开展了风氧化带工程地质特征研究。基于工作面井下顶板钻探工程,对工作面顶板30 m范围内取芯,在此基础上,采用X射线衍射(X-ray diffraction,XRD),开展了风氧化带岩石矿物成分分析;采用室内物理、力学试验,开展了新鲜及风氧化岩石物理、力学性质测试;基于岩石力学特性及岩芯宏观地质特征,对工作面顶板风氧化带发育深度及程度进行了评价。结果表明:基岩风氧化带岩石矿物成分以高岭石、蒙脱石、伊利石等黏土矿物为主,遇水易膨胀,对抑制顶板导水裂缝带发育有益;受风氧化作用影响,岩石孔隙率提升约15%,单轴抗压强度降低约50%,泥岩较砂岩工程地质条件劣化更加明显;工作面基岩风氧化带深度16~20 m,并划分了风氧化程度等级,岩石风氧化程度主要表现为强风化-全风化。研究成果对工作面支架选型及顶板管理提供了依据和参考,为类似条件工作面风氧化带探查与工程地质条件评价提供了借鉴。The shallow working face of the hidden coal field is affected by the wind-oxidized zone of the bedrock of the roof,and under the influence of wind-oxidization,the engineering geological conditions of the rock body deteriorate,which has a greater impact on the management of the roof of the working face and the prevention and control of water hazards.The engineering geological characteristics of wind-oxidized zone were studied in the working face of 1410(3)near loose layer in Zhangji coal mine,Huainan mining area,Anhui Province,as an example.Based on the drilling project of the underground roof of the working face,cores were taken within 30 m of the roof of the working face,and on the basis of which,the mineral composition analysis of the wind-oxidized zone rocks was carried out by X-ray diffraction(XRD).The physical and mechanical property tests of fresh and wind-oxidized rocks were carried out by indoor physical and mechanical tests,and the depth and degree of development of the wind-oxidized zone on the top of the working face were evaluated based on the rock mechanical properties and macro-geological characteristics of the core.The results show that the mineral composition of bedrock wind-oxidized zone is dominated by kaolinite,montmorillonite,illite and other clay minerals,which are easy to expand in contact with water,and are beneficial to inhibit the development of water-conducting crack zones in the roof slab.Under the influence of wind-oxidized action,the porosity of the rock increases by about 15%,and the uniaxial compressive strength is reduced by about 50%,which makes the deterioration of the engineering geological conditions of the mudstone more obvious than that of the sandstone.The depth of the wind-oxidized zone of bedrock in the working face is about 16~20 m,and the wind-oxidized degree is divided into grades.The degree of rock wind oxidation is mainly manifested as strong weathering-complete weathering.The research results provide the basis and reference for the selection of support type and roof

关 键 词：力学强度 顶板 基岩风氧化带 工程地质特征 

分 类 号：TD82-9[矿业工程—煤矿开采]