千米深井锰矿炭质页岩顶板巷道围岩变形破坏特征  

The Deformation and Failure Characteristics of Carbonaceous Shale Roof Roadway of Surrounding Rock in Kilometer Deep Well Manganese Ore Mine

作　　者：申业兴 高林[1,2,3] 黄小芬 赵世毫[1] 战新宇 赵芳昊 SHEN Yexing;GAO Lin;HUANG Xiaofen;ZHAO Shihao;ZHAN Xinyu;ZHAO Fanghao(Mining College,Guizhou University,Guiyang 550025,China;Research Center of Roadway Support and Disaster Prevention Engineering in Coal Industry,Beijing 100083,China;National&Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas,Guiyang 550025,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]煤炭行业巷道支护与灾害防治工程研究中心,北京100083 [3]喀斯特地区优势矿产资源高效利用国家地方联合工程实验室,贵州贵阳550025

出　　处：《金属矿山》2023年第12期14-22,共9页Metal Mine

基　　金：国家自然科学基金项目(编号:52004073,52264008);贵州省科技支撑计划项目(编号:黔科合支撑[2021]一般400,黔科合支撑[2023]一般288);贵州大学引进人才科研基金项目(编号:贵大人基合字[2020]42号);贵州大学培育项目(编号:贵大培育[2019]27号)

摘　　要：贵州省锰矿埋深普遍较深且巷道顶板以炭质页岩为主,层间节理、裂隙发育,导致该类巷道围岩变形破坏较为严重。为了揭示千米深井锰矿炭质页岩顶板巷道围岩变形破坏特征,以贵州铜仁某千米深井锰矿-75 m中段回风平巷为例,基于围岩力学试验及数值仿真试验方法,对不同炭质页岩厚度下中段回风平巷的变形破坏特征进行分析。结果表明:千米深井锰矿中段回风平巷炭质页岩顶板及锰矿层天然状态下抗压强度分别为70 MPa、60 MPa,炭质页岩坚固性系数为3.4~5.0;随着炭质页岩顶板厚度增加,巷道顶板及两帮位移量逐渐增大,顶板最大垂直位移量为96.7 mm,左、右两帮最大水平变形值分别为117 mm、104 mm,且两帮位移图像整体呈现出“倒V”字形分布,表现出显著差异性变形破坏特征;巷道顶板塑性区范围随着炭质页岩厚度增大而扩大,在炭质页岩厚度为3 m时,塑性区体积达到最大值,且巷道塑性区以剪切破坏为主,剪切破坏体积占塑性区总体积的93.82%。综合分析得出,随着炭质页岩厚度的增加,顶板破坏范围越大,围岩稳定性越差,故加强深井高应力锰矿炭质页岩顶板非对称冒落拱的控制是该类巷道围岩稳定性控制的关键。Manganese ore mines in Guizhou Province are generally buried deep and the roof of the roadway is dominated by carbonaceous shale,interlayer joints and cracks development,resulting in serious deformation and failure of the surrounding rock of such roadway.In order to reveal the deformation and failure characteristics of the surrounding rock of carbonaceous shale roof roadway in the middle section of the kilometer deep well manganese ore mine,taking the-75 m middle air return roadway of a kilometer deep well manganese ore mine in Tongren,Guizhou as an example.based on the surrounding rock mechanics experiments and numerical simulations test method,the deformation and failure characteristics of the middle air return roadway under different thicknesses of carbonaceous shale are analyzed.The results showed that the compressive strength of the carbonaceous shale roof and manganese ore layer in the natural state of the middle section air return roadway in kilometer deep manganese ore mines was 70 MPa and 60 MPa respectively,and the cohesion coefficient of the carbonaceous shale was 3.4~5.0.With the increase of the carbonaceous shale roof thickness,the displacement of the roof and both sides of the roadway gradually increased.The maximum displacement of the roof was 96.7 mm,and the maximum deformation values of the left and right sides were 117 mm and 104 mm respectively.Moreo ver,the displacement distribution of both sides exhibited"Inverted V"shape,showing distinctive deformation and failure characteristics.The plastic zone range of the roadway roof increases with the increase of the thickness of the carbonaceous shale.When the thickness of the carbonaceous shale is 3 m,the plastic zone volume reaches the maximum value.Moreover,the plastic zone of the roadway is dominated by shear failure,and the shear failure volume accounts for 93.82%of the total volume of the plastic zone.The comprehensive analysis shows that with the increase of the thickness of carbonaceous shale,the greater the failure range of the roof,and the s

关 键 词：千米深井 炭质页岩 围岩变形 走向长壁开采 力学特性 

分 类 号：TD322[矿业工程—矿井建设]