The study of the engineering geological properties of Boroujerd granites

The abundance of granitic rocks and their frequent use as ornamental stones and Malones has made the recognition of their engineering geological properties important. Recognizing the diverse lithological, physical and mechanical properties of these rocks is also of importance because they are used in the construction of dams, and foundations of residential and commercial structures in different regions of the country. In this research, based on field studies in the north and north- east Boroujerd, appropriate Boroujerd granite mass crops were identified and sampled. Through studying thin sections taken from 7 mines the textual, mineralogical and geological characteristics of granites were determined. According to the results, Boroujerd granite masses composed of granodiorite, monzogranite, white granite and tonalite. Also petrological studies show the microscopic fractures caused by the active tectonic zone. In this study, using standard tests, the physical and mechanical properties of 224 samples of granite were determined. According to Anon's classification the density of Boroujerd granites are medium to high. Water absorption in most samples is less than 1 percent. Their maximum hardness is 53 and at least 39. The highest and lowest tensile strength when dry is 3.6 and 12 MPa. Based on maximum uniaxial compressive strength and elasticity ratio, and according to the engineering classification of intact rocks Boroujerd granites are classified in the categories of CL and BL. The obtained relations between lithological, physical and mechanincal properties and proper correlation coefficient can be used in geological studies and civil engineering projects of the area.