两种岩石材料表面剥落特征及形成机制差异性的研究

 针对两种不同岩性的岩石材料——灰色中粒黏土质长石砂岩和微晶白云石大理岩，通过表面回弹测试、X射线衍射、扫描电镜等测试手段，对材料表面常见的一种破坏现象——剥落的形成机制及其对岩石表面力学性能影响的基本规律进行分析。研究结果表明：表面剥落对岩石材料表面力学性能影响极大，不同岩性岩石材料和不同剥落形式表面力学性能的改变存在较大的差异性，其中黏土质砂岩表面片状和鳞片状剥落、微晶白云石大理岩表面鳞片状剥落比微晶白云石大理岩表面粒状剥落对表面力学性能的影响更大，这主要是由不同岩性岩石的矿物成分和结构特点上的差异性导致的。

RESEARCH ON SURFACE EXFOLIATION CHARACTERS AND DIFFERENCE OF FORMATION MECHANISM BETWEEN TWO KINDS OF ROCK MATERIALS

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.