As an important mechanical index of rock,fracture toughness is of great significance to understanding the compression-shear failure.In order to carry out a punch-through shear test with confining pressure(PTS/CP),the test function was developed based on the existing equipment,and the PTS/CP experiment research of green sandstone was carried out.The test results show that under the constraint of confining pressure,the rock has an ideal punching shear failure surface,and with the increase of confining pressure the mode Ⅱ fracture toughness(KⅡC)first increases and then tends to be stable.The relationship between(KⅡC)obtained through PTS/CP,uniaxial tensile strength,and mode Ⅰ fracture toughness index of green sandstone conforms to the conventional understanding,which shows the reliability and effectiveness of this functional development,and it can provide experimental support for the related teaching and scientific research.
关键词
围压冲剪试验/测试功能开发/Ⅱ型断裂韧度/压剪破坏
Key words
the punch-through shear test with confining pressure/test function development/mode Ⅱ fracture toughness/compression-shear failure
维普
万方数据