Abstract：For the two kinds of rock materials，grey mediun-grained clay feldspathic sandstone and microlite dolomitic marble，by means of Schmidt hammer test，X-ray diffraction，scanning electron microscope，the formation mechanism of exfoliation and its effect on the mechanical properties of rock surface are analyzed. The results show that the exfoliation has an important effect on the mechanical properties of rock surface. It has an obvious difference of mechanical properties variations between different kinds of rocks with different exfoliation shapes. The flaking and scale exfoliations of the two kinds of rock materials have more effects than granular exfoliation of microlite dolomitic marble on the mechanical properties of rock surface. This difference is caused by the different mineral components and textures of the two kinds of rock materials.
