煤矿采动过程中底板破坏特征及地下水流场分布预测研究  

Study on characteristics of floor failure and prediction of groundwater flow field distribution during coal mining

作　　者：刘敬东 田灵涛 余波 许宏阳 张国忠 Liu Jingdong;Tian Lingtao;Yu Bo;Xu Hongyang;Zhang Guozhong(State Power Construction Investment Inner Mongolia Energy Co.,Ltd.,Ordos 017209,China;Xuzhou Hongyi Technology Development Co.,Ltd.,Xuzhou 221000,China)

机构地区：[1]国电建投内蒙古能源有限公司,内蒙古鄂尔多斯017209 [2]徐州弘毅科技发展有限公司,江苏徐州221000

出　　处：《能源与环保》2023年第9期248-256,共9页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金项目(51874284);深井瓦斯抽采与围岩控制技术国家地方联合工程实验室开放基金项目(SJF201801)。

摘　　要：为了进一步得出底板采动过程中的变形损伤破坏特征,以某工作面为研究对象,借助FLAC 3D数值模拟软件,分析了工作面回采过程中底板渗透性演化规律,将采动过程中底板渗透性变化定量地进行分区,明确煤层开采引起底板不同区域渗透率失稳情况。利用GMS地下水系统模拟软件,分析了工作面开采后底板无注浆与底板注浆条件下地下水位变化规律。研究得出,采空区中部底板渗透率增大区域分为4个区域,随深度增大,渗透率增大倍数由7倍逐渐减小至原始渗透率,工作面回采引起底板渗透率变化区域整体呈“倒马鞍形”分布。当保水工程施工后,水位下降速度明显减下,随着保水工程继续实施,预计到2024年6月,模拟水位达到+1124.45 m。In order to further obtain the deformation,damage and failure characteristics of the floor during floor mining.With the help of FLAC 3D numerical simulation software,taking a certain working face as the research object,the evolution law of floor permeability during the mining process of the working face was analyzed.The changes in floor permeability during the mining process were quantitatively divided into zones to clarify the instability of permeability in different areas of the floor caused by coal seam mining.The GMS groundwater system simulation software was used to analyze the groundwater level changes under the conditions of no grouting and grouting in the floor after mining.The study shows that the area of floor permeability increase in the middle of the goaf is divided into four areas.With the increase of the depth,the permeability increase multiple gradually decreases from 7 times to the original permeability.The area of floor permeability change caused by the mining of the working face is distributed as an"inverted saddle".After the construction of the water conservation project,the rate of water level decline will decrease significantly.With the continued implementation of the water conservation project,it is estimated that the simulated water level will reach+1124.45 m by June 2024.

关 键 词：底板破坏特征 FLAC 3D数值模拟 地下水 水流场 GMS 

分 类 号：TD325[矿业工程—矿井建设] P641.4[天文地球—地质矿产勘探]