砂岩在单轴压缩条件下的声发射特性研究

Experimental Test on Characteristics of Acoustic Emission of Anisotropic Sandstone under Uniaxial Compression

对云南南坡铜矿两种砂岩进行了单轴压缩试验,并利用SDAES型数字声发射仪测试了加载过程中的声发射活动。结果表明,岩石的变形与声发射活动存在较好的对应性;声发射活动也受岩石各向异性的影响。第一组砂岩各向异性较为显著,试样垂直层理加载时,弹性模量明显小于平行层理加载时的弹性模量,强度明显大于平行层理加载时的强度,声发射也较平行层理加载时更为活跃。第二组砂岩试样的试验结果与此类似,但其岩石各向异性不显著,垂直层理加载和平行层理加载时岩石的弹性模量、强度及声发射相差均相对较小。

Uniaxial compressive texts were performed with two types of sandstone from Nanpo Copper Mine.Deformation behavior and acoustic emission（AE） of samples were investigated.Results show there＇s generally a good correlation between AE activity and rock deformation,and AE activity is also affected by the anisotropy of rocks.It is found that the first group of sandstone sample has remarkable anisotropic property,under two conditions with load being applied perpendicular and parallel to the bedding,the elastic modulus in the first condition is much less than that in the second condition,but the strength is greater and AE is more active in the first condition.While the second group of sandstone sample doesn＇t show obvious anisotropic property,there＇s relatively small difference between elastic modulus,strength and AS under those two conditions.