Study On The Physical And Mechanical Properties Of The Granite And The Micro-mechanical Properties Of The Macro

There are many kinds of vast rocks in China.Granite is an important part of rock and has many applications in rock engineering practice.Therefore,it is necessary to understand the geological origin,mesostructure and mechanical properties of granite.In view of this,this paper summarizes and experimentally studies the relationship between physical and mechanical properties of granite and macro-micro mechanics,and draws the following conclusions:(1)The system summarizes the relationship between geological origin of granite and crust,tectonic environment and continental hyperplasia,as well as the main classification methods of granite and domestic,and compares the advantages and disadvantages of these classification methods.Further analysis of granite at different temperatures,different degrees of weathering and Mesoscopic structural features of the degree of damage.(2)The mechanical properties of granite under weathering conditions,temperature conditions and load conditions are summarized.The main failure modes of granite and the variation of mechanical parameters such as compressive strength,elastic modulus and Poisson's ratio were studied under different weathering degrees,different temperatures and different loading and unloading conditions.(3)For Dagangshan granite,the elastic modulus,cohesion and friction angle of Dagangshan granite were obtained by triaxial test and uniaxial test.X-ray diffraction(XRD)and scanning electron microscopy(SEM)were used to study the composition proportion of granite minerals and their basic microscopic characteristics.On this basis,mechanical parameters such as elastic modulus and hardness of quartz and feldspar in the mineral composition of Dagangshan granite were obtained by micro-and nano-indentation tests.Combined with the test results of macro-and micro-mechanical parameters of Dagangshan granite and the results of mineral composition proportion,the relationship between macro-and micro-mechanical parameters of Dagangshan granite is studied based on genetic fuzzy algorithm and the corresponding empirical expression is established.The results show that the elastic modulus of granite increases with the increase of confining pressure.The elastic modulus of quartz and feldspar basically determines the elastic modulus of granite,but the elastic modulus of quartz plays an important role in the study of macro-and micro-mechanical properties of granite.Figure 65 table 19 references 215...