层状砂岩静动力学特性对比

文章为研究层状砂岩在冲击荷载和静荷载作用下层状砂岩的力学特性,对层理倾角为0°、15°、30°、45°、60°、75°、90°的试样进行冲击压缩实验和静力压缩实验。对2种试验的结果进行对比分析发现：随层面倾角增大,砂岩峰值强度先减小再后增大;试样冲击压缩时试样峰值强度较大;静载条件下,随角度的增大,弹性模量与强度均而先增加后减小再增加,冲击压缩时,随角度的增加,弹性模量的变化呈先增加再减小的趋势,强度的变化呈先减小后增大的“U”形;单轴压缩实验中,倾角为0°~75°试样发生剪切破坏,倾角为90°的试样发生劈裂和剪切混合破坏;冲击荷载作用下,试样在倾角0°~60°时破碎形状为块状,倾角在75°和90°时破坏形状为块状和片状混合。

Comparative study on static and dynamic characteristicsof layered sandstone

The article studies the mechanical properties of layered sandstone under impact load and static load, shock compression tests and static compression tests were carried out on specimens with bedding dip angle of 0 °, 15 °, 30 °, 45 °, 60 °, 75 ° and 90 °. It is found that the peak strength of sandstone decreases first and then increases with the increase of dip angle; the peak strength of sample is larger during impact compression; under static load, As the angle increases, both the elastic modulus and strength first increase, then decrease and then increase. During impact compression, as the angle increases, the elastic modulus changes in a reverse "N" shape that first decreases, then increases and then decreases. , The change of intensity takes a "U" shape that first decreases and then increases , In the uniaxial compression test, the specimens with an inclination angle of 0° - 75 ° undergo shear failure, and the specimens with an inclination angle of 90 ° undergo splitting and shear mixed failure; under the shock compression, the specimens with an inclination angle of 0°- 60 ° are broken in a block shape, while the specimens with an inclination angle of 75 ° and 90 ° are in a mixed shape of block and sheet.