摘要
为研究表面裂隙对红砂岩力学行为的影响,采用不同深度的表面预制裂隙红砂岩进行单轴压缩试验,结果表明:预制表面裂隙砂岩试样的峰值强度和弹性模量与完整砂岩试样相比均有不同程度下降,弹性模量随着裂隙深度增加呈二次抛物线下降。砂岩的破坏模式随着预制裂隙深度的增加由劈裂破坏逐渐向剪切破坏转变,试样加载后裂纹主要为翼裂纹和反翼裂纹,反翼裂纹随着裂隙深度增加逐渐由次裂纹发展成为主裂纹,主裂纹与预制裂纹之间的夹角则是先减小后增大。试验结果表明红砂岩表面预制裂隙深度对其力学行为影响较大。
To study the effect of surface crack of red sandstone mechanical behavior,uses the compression test,the results show that the surface of the prefabricated crack sandstone sample peak strength and elastic modulus decreased compared with complete sandstone samples are different depth of the surface of the prefabricated crack of red sandstone under uniaxial different,the elastic modulus decreases with the increase of crack depth in a quadratic parabola.The failure mode of sandstone gradually changes from splitting failure to shear failure with the increase of the prefabricated crack depth.After sample loading,the main cracks are wing crack and anti-wing crack,With the increase of crack depth,the reverse wing crack gradually develops from the secondary crack to the main crack.and the included Angle between the main crack and the prefabricated crack first decreases and then increases.The experimental results show that the prefabricated fracture depth on the surface of red sandstone has great influence on its mechanical behavior.
作者
陆永龙
Lu Yonglong(Xinjiang University,Urumchi 830046,China)
出处
《科学技术创新》
2022年第31期98-101,共4页
Scientific and Technological Innovation
关键词
表面裂隙
峰值强度
劈裂破坏
裂纹
surface fracture
peak intensity
splitting failure
the crack
