新疆花岗岩物理力学性质的矿物组成和微观结构分析

为分析不同类型花岗岩物理力学性质差异，通过选取不同粒径的新疆花岗岩试样进行电镜扫描和矿物成分测试试验，研究岩石矿物组成和微观结构与其物理力学性质之间关系。结果表明：花岗岩中石英和长石矿物胶结很好而具有孔隙率低和强度高特点；随着粒径增大，花岗岩中云母含量增加，导致粗粒花岗岩的孔隙率较高和强度偏低；通过电镜扫描得出花岗岩微观结构质密，矿物胶结很好，颗粒分布均匀，从而具有孔隙率低和强度高特点，同时由于细粒花岗岩微观结构更质密且晶粒镶嵌紧密而孔隙率最低但强度最高。可见天湖细粒花岗岩体由于质密、低孔隙率和高力学强度的特点更适合作为高放废物地质处置岩体。

Mineral Composition and Microscopic Analysis study for Physical and Mechanical Properties of Xinjiang Granite

In order to analyze the differences of physical and mechanical properties of different types of granites, the relationship between rock mineral composition, microstructure and physical, mechanical properties was studied through scanning electron microscopy and mineral composition testing for the different particle sizes Xinjiang granites. The results showed that granite have the characteristics of low porosity and high strength due to the quartz and feldspar minerals good cementation. With the increase of particle size, the mica content in granite increases, and lead to higher porosity and lower strength of coarser granite. The microstructure of granite is dense, the mineral cementation is good, and the grain distribution is uniform through scanning electron microscope, so granite has the characteristics of low porosity and high strength. At the same time, the fine-grained granite has the lowest porosity but the highest strength because of its more dense microstructure and close grain inlaid. It can be seen that tianhu fine-grained granite is more suitable for geological disposal of high radioactive waste because of its dense mass, low porosity and high mechanical strength.