缓倾斜煤层开采底板破坏深度数值分析研究  

Numerical analysis of floor failure depth in gently inclined coal seam mining

作　　者：查春雷 袁二军 史立群 彭红明 屈宏飞 ZHA Chunlei;YUAN Erjun;SHI Liqun;PENG Hongming;QU Hongfei(School of Geological Engineering,Qinghai University,Xining 810016,China;Qinghai Bureau of Environmental Geology Exploration,Qinghai Engineering Research Center of Geoenvironment Protection and Geohazard Prevention,Xining 810001,China;Qinghai 906 Engineering Survey and Design Institute,Xining 810001,China)

机构地区：[1]青海大学地质工程学院,青海西宁810016 [2]青海省环境地质勘查局/青海省地质环境保护与灾害防治工程技术研究中心,青海西宁810001 [3]青海九零六工程勘察设计院有限责任公司,青海西宁810001

出　　处：《中国矿业》2024年第8期169-175,共7页China Mining Magazine

基　　金：湟水河流域护坡植物降盐效应及其增强边坡稳定性研究项目资助(编号:k152407)。

摘　　要：研究煤层开采过程中底板破坏深度对防治矿井底板水害具有重要意义,数值模拟避免了因现场条件复杂而无法进行实测的情况,可以在煤层开采前模拟和预测破坏深度,为开采工作提供参考。以梁北煤矿32021工作面为例,基于统计规律的经验公式进行了理论计算,得到的底板破坏深度分别为27.05 m、25.63 m、23.56 m,其中,考虑采深和煤层倾角的27.05 m更接近实际情况。使用FLAC^(3D)进行数值模拟,模拟并分析了工作面推进过程中的应力变化规律和底板破坏深度。在数值模拟的过程中,煤层底板的垂直应力变化结果表明,随着工作面不断推进,顶底板应力增大,采空区两端出现应力集中现象,影响范围不断增大,同时底板破坏深度也会随之增加;煤层底板的塑性破坏结果表明,底板破坏深度随工作面的推进而不断增大,当工作面推进至100 m时,底板破坏深度达到最大,之后破坏深度保持不变,破坏范围会一直随之增加;工作面推进100 m时,煤层底板下不同深度的塑性破坏结果表明,随着深度增加,破坏范围不断减小,可判断出煤层底板最大破坏深度约为25.9 m。It is of great significance to study the floor failure depth in the process of coal seam mining for the prevention of water disaster to mine floor.Numerical simulation can simulate and predict the failure depth before coal seam mining,which can provide reference for mining work,because it avoids the situation that it cannot be measured due to complex site conditions.Taking 32021 working face of Liangbei Coal Mine as an example,the theoretical calculation is made based on the empirical formula of statistical law,and the obtained floor failure depth is 27.05 m,25.63 m and 23.56 m.Considering the mining depth and the coal seam dip angle,27.05 m is closer to the actual situation.FLAC^(3D) is used for numerical simulation to simulate and analyze the stress variation law and the failure depth of the floor during the advancing process of the working face.In the process of numerical simulation,the change of vertical stress of the coal seam floor shows that with the continuous advance of the working surface,the stress on the roof and floor increases,and the phenomenon of stress concentration occurs at both ends of the goaf,the influence range increases,and the failure depth of the floor also increases.The plastic failure results of coal seam floor show that the floor failure depth increases with the advance of working face.When the working face advances to 100 m,the floor failure depth reaches the maximum,and then the failure depth remains unchanged and the failure range will increase.When the working face is advanced by 100 m,the plastic failure results of different depths under the coal seam floor show that the failure range decreases with the increase of depth,and the maximum failure depth of the coal seam floor can be judged to be about 25.9 m.

关 键 词：矿井水害 底板破坏深度 缓倾斜煤层 FLAC^(3D) 数值模拟 

分 类 号：TD745[矿业工程—矿井通风与安全]