盘江矿区回采巷道围岩特征实验研究  

Experimental Study on Surrounding Rock Characteristics of Gateway in Panjiang Mining Area

作　　者：高林[1,2,3] 赵世毫 黄小芬 马振乾[1,3] 孔德中[1,3] 康向涛[1,3] 韩森[1,3] GAO Lin;ZHAO Shihao;HUANG Xiaofen;MA Zhenqian;KONG Dezhong;KANG Xiangtao;HAN Sen(College of Mining,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,Guizhou University,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]贵州大学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：《贵州大学学报（自然科学版）》2022年第4期42-47,共6页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金资助项目(52004073,52064009);贵州省科技支撑计划资助项目(黔科合支撑[2021]一般400);贵州省科学技术基金资助项目(黔科合基础[2020]1Y216);贵州大学引进人才科研基金资助项目(贵大人基合字[2020]42号);贵州大学培育资助项目(贵大培育[2019]27号)。

摘　　要：为进一步揭示盘江矿区回采巷道围岩变形机理,采集矿区范围内三对典型矿井回采巷道围岩煤岩样进行了点载荷、坚固性系数测定、矿物成分分析、耐崩解指数测定、水理特性等一系列围岩特征实验研究。结果表明:盘江矿区回采巷道顶底板岩层多为泥岩、泥质粉砂岩等软弱岩层,天然状态下抗拉强度、抗压强度及抗剪强度分别低至0.32 MPa、6.34 MPa及0.77 MPa,且煤的坚固性系数仅为0.50~0.86,矿区内回采巷道围岩软岩特征明显;围岩矿物成分以石英为主,但高岭石、钠长石等黏土矿物含量较高,遇水极易膨胀,裂隙及节理发育,围岩强度大幅度降低;围岩抵抗软化和崩解作用的能力较差,其中底板泥岩的耐崩解性指数低至8.70%。研究结论可为盘江矿区回采巷道围岩控制方案的制定提供科学依据和理论指导。To further reveal the deformation mechanism of surrounding rock of gateway in Panjiang mining area,coal and rock samples of surrounding rocks of three typical gateways in mining area were collected,and a series of surrounding rock characteristics such as point load,determination of the firmness coefficient,mineral composition analysis,determination of the disintegration resistance index and hydraulic characteristics were studied.The results show that the roof and floor strata of gateway in Panjiang mining area are mostly mudstone,argillaceous siltstone and other soft strata.Under natural conditions,the tensile strength,compressive strength and shear strength are as low as 0.32 MPa,6.34 MPa and 0.77 MPa,and the firmness coefficient of coal is only 0.50-0.86.The characteristics of the soft surrounding rock of gateway in mining area are obvious.The main mineral composition of surrounding rock is quartz,but the contents of clay minerals such as kaolinite and albite are high,so the surrounding rock is easily expansive when meeting with water,fractures and joints are also developed,leading to a great reduction in the strength of surrounding rock.Besides,the ability of surrounding rock to resist softening and disintegration is poor,and the disintegration resistance index of mudstone on floor is as low as 8.70%.The research conclusions can provide scientific basis and theoretical guidance for the formulation of surrounding rock control scheme of gateway in Panjiang mining area.

关 键 词：盘江矿区 软岩 物理力学性质 回采巷道 

分 类 号：TD82[矿业工程—煤矿开采] TD313[矿业工程—矿山开采]