实验岩石裂隙微观形态初探

通过对石灰岩、砂岩试件施以短期拉伸、压缩和三点弯曲梁实验所形成的裂隙微观形态研究表明,圆柱状试件在拉伸条件下产生的张裂纹较密集,形成追踪状、锯齿状形态,断裂之间交角一般小于90°;在单轴压缩情况下则以剪破裂为主,且裂纹平直,延伸较远;而三点弯曲梁试件中形成的两组裂纹交角一般大于90°,且裂纹壁面较光滑。此外,加载短期应力所形成的破裂纹中均无充填物. 

MICROMORPHOLOGY OF EXPERIMENTAL ROCK CRACKS

Short duration compression,extension and bending experiments of limestone and sandstone cylinders were made in the laboratory.The tensile microcracks produced by extension are closely spaced,leaving zigzag trails at an angle of less than 90 degrees to the extension uniaxial compression produced dominantly relatively long and straight ones,while bending gave rise to two sets of smooth fractures intersecting at an angle of more than 90 degrees towards bending.