层理倾角对岩石力学与声发射特征的影响研究  

Effect of Bedding Angle on Mechanical and Acoustic Emission Characteristics of Layered Rock

作　　者：孙清佩 张志镇[1,2] 杜雷鸣[1,2] 侯鹏[1,2] 滕腾[1,2] 尚晓吉[1,2] 

机构地区：[1]中国矿业大学力学与土木工程学院,江苏徐州221116 [2]深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《金属矿山》2017年第2期7-13,共7页Metal Mine

基　　金：国家自然科学基金项目(编号:51604260);国家重点研发计划项目(编号:2016YFC0600705);中国博士后科学基金项目(编号:2016T90519);江苏省博士后科研计划项目(编号:1501085B);四川省科技厅科技支撑计划项目(编号:2012fz0124);国家大学生创新训练计划项目(编号:201610290013)

摘　　要：层理倾角对岩石受载下的力学性质和声发射特征有重要的影响。通过对0°、15°、30°、45°、60°、75°、90°倾角试样的单轴压缩模拟试验,获得了层理岩石抗压强度、破坏模式、声发射振铃数等随层理倾角的变化规律。研究结果表明:1随着层理倾角的增加,试样单轴抗压强度存在着先增大后减小又增大的过程;2大致分为3种破坏模式,15°和30°倾角试样劈裂与剪切破坏并存,以劈裂破坏为主,属于先基质后层理型破坏;45°、60°、75°倾角试样劈裂裂纹相对较少,剪切破坏显著,属于先层理后基质型破坏;0°和90°倾角试样出现大断口,属于局部强烈基质型破坏;30°、15°、30°和90°倾角试样声发射静默期长,活跃期短,其最大声发射数大,声发射增长速率快;而45°、60°和75°倾角试样静默期短,活跃期长,其最大声发射数小,声发射增长速率慢。Bedding angle has an important influence on the mechanical properties and acoustic emission characteristics of rock.By uniaxial compression simulation on layered rock with 0°,15°,30°,45°,60°,75°,90° inclination,the variation of compressive strength,failure mode,acoustic emission number with bedding dip were obtained,and the results showed that： 1 with the increase of bedding angle,uniaxial compressive strength of the sample first decreases and then increases; 2There are three kinds of failure modes.Splitting and shear failure coexist in 15° and 30° samples,and splitting failure is the main part,which is the failure mode of from matrix to bedding; shear failure plays significant part in 45°,60°,75° samples,with failure mode of from bedding to matrix; big fracture areas exists in 0° and 90°specimens,belonging to a local strong matrix-type failure; 3 for 0°,15°,30° and 90° samples,silent period of acoustic emission is long and its active period is short,and the maximum number is large,and acoustic emission increases fast; the 45°,60° and 75° samples exhibit the opposite behavior correspondingly.

关 键 词：岩石力学 层状岩石 力学性质 声发射 层理倾角 

分 类 号：TU452[建筑科学—岩土工程]