高温循环作用含孔砂岩动态力学特性试验研究  

Experimental Study on Dynamic Mechanical Properties of Sandstone with Hole under High Temperature Cycling Action

作　　者：平琦 后健民[2,3] 胡薇 钱明 孙栋 PING Qi;HOU Jianmin;HU Wei;QIAN Ming;SUN Dong(State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine,Huainan 232001,China;Engineering Research Center of Mine Underground Projects,Ministry of Education,Anhui University of Science and Technology,Huainan 232001,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001 [2]安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001 [3]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《金属矿山》2024年第10期76-84,共9页Metal Mine

基　　金：国家自然科学基金项目(编号:52074005,52074006);安徽省自然科学基金项目(编号:1808085ME134)。

摘　　要：为研究高温循环作用含孔砂岩动态力学特性,利用SHPB试验装置对常温和经历200~800℃高温循环作用后含孔和完整砂岩试件开展冲击压缩试验。研究表明:随循环作用温度升高,砂岩试件由灰色逐渐变成褐色;质量损失率、体积膨胀率和密度降低率等物理参数均呈增大趋势,超过400℃时变化幅值显著增加;常温砂岩含有少量微孔隙,随循环作用温度升高试件表面微孔隙数量增多、宽度增大。高温循环作用后含孔试件动抗压强度呈二次函数关系减小趋势;动应变和动弹性模量则分别呈幂函数增大和线性函数关系减小趋势。随循环作用温度升高,试件破碎程度加剧,破碎块度减小,分形维数呈幂函数关系增大趋势;循环作用温度超过400℃时,试件动抗压强度、动应变、平均粒径和分形维数变化幅值均显著增大。研究成果对深部矿山资源开采和地热利用具有一定参考价值。In order to study the dynamic mechanical properties of sandstone with hole under high temperature cycle,the impact compression test of porous and intact sandstone specimens at room temperature and after 200~800℃high temperature cycle was carried out by using SHPB test device.With the increase of cyclic temperature,the sandstone specimens gradually changed from gray to brown,and the physical parameters such as mass loss rate,volume expansion rate and density reduction rate showed an increasing trend,and the variation amplitude increased significantly when the temperature exceeded 400℃.The sandstone at room temperature contains a small amount of micropores.With the increase of cyclic temperature,the number and width of micropores on the surface of the specimen increase.After the high temperature cycle,the dynamic compressive strength of the specimen with hole decreases in a quadratic function relationship.The dynamic strain and dynamic elastic modulus show a trend of power function increase and linear function decrease,respectively.With the increase of cyclic temperature,the fragmentation degree of specimens increases,the fragmentation size decrease,and the fractal dimension shows a trend of power function increase.When the cyclic temperature exceeds 400℃,the dynamic compressive strength,dynamic strain,average particle size and fractal dimension of the specimens increase significantly.The research results have certain reference value for deep mine resource exploitation and geothermal utilization.

关 键 词：岩石动力学 高温循环 含孔砂岩 动态压缩 SHPB试验装置 分形维数 

分 类 号：TD315[矿业工程—矿井建设]