表面裂隙倾角对红砂岩试件的影响试验研究  

Experimental Study on the Influence of Surface Crack Inclination on Red Sandstone Specimens

作　　者：周臣[1] 李志臣 李廷春[1] 杜贻腾 单梁 王凯[1] ZHOU Chen;LI Zhichen;LI Tingchun;DU Yiteng;SHAN Liang;WANG Kai(Shandong University of Science and Technology,Qingdao,Shandong 266590,China)

机构地区：[1]山东科技大学,山东青岛市266590

出　　处：《矿业研究与开发》2020年第11期59-63,共5页Mining Research and Development

基　　金：国家自然科学基金资助项目(41772299)。

摘　　要：为了分析裂隙倾角对含表面裂隙红砂岩试样的变形破坏模式和强度特性的影响机理,制作了一组含不同倾角半币状三维表面单裂隙的红砂岩试样,研究了其在单轴压缩条件下的强度变形特性与裂隙扩展模式。试验结果表明,破坏过程分为孔隙压密、弹性变形、非稳定发展和应变软化4个阶段。试样的峰值强度随裂隙倾角增加先降低后增加,裂隙倾角为60°时峰值强度最低,裂隙倾角为75°时峰值强度明显增加;试样破坏模式宏观表现为"H"型破坏,由翼裂纹和反翼裂纹组成的宏观裂纹引起;CT扫描发现,反翼裂纹是含45°倾角裂隙试件破坏的主导裂纹。In order to analyze the influence mechanism of surface crack inclination on the expansion mode and strength characteristics of red sandstone specimens,agroup of red sandstone specimens with half-coin shape three-dimensional surface single-crack and inclination angles were prepared.The strength and deformation characteristics and crack extension mode of these specimens under uniaxial compression condition were studied.The test results show that the failure process can be divided into four stages,including the pore compaction stage,the elastic stage,the unstable development stage and the strain softening stage.The peak strength of the specimens firstly decreases and then increases with the increase of crack angle.The peak strength is the lowest when the crack inclination is 60°and increases significantly when the crack inclination is 75°.The failure mode of the specimen is"H"type,which is caused by the macro crack composed of wing crack and anti-wing crack.CT scan shows that the anti-wing crack is the dominant crack in the specimen with crack inclination of 45°.

关 键 词：裂隙倾角 单轴压缩 峰值强度 裂隙扩展模式 CT扫描 反翼裂纹 

分 类 号：TD315[矿业工程—矿井建设]