جستجوی مقالات مرتبط با کلیدواژه "strain" در نشریات گروه "میان رشته ای"

The deformed Sehchangi conglomerate is exposed with an angular unconformity on the Triassic sediments on the curved northwestern border of the Sistan and Lut terrains. The Sehchangi conglomerate was undergone brittle deformation, consequently the extension and conjugate shear fractures occurred in its and no ductile deformation has been seen in matrix and pebbls of this conglomerate. According to extensional fractures, the value of strain longitudinal parameters was obtained as follows: e=0.15, S=1.15, =1.32 and =0.75. Also, the stress analysis of conjugate shear fractures in this conglomerate by the "right dihedral" and "rotational optimization" methods were calculated 1=23/190, 2=43/77, 3=38/299 and R()=0.7, R=1.23. These results indicate that the conglomerate has been experienced an elongation with some volume changes along the N70W direction. According to study of extension and conjugate shear fractures, it seems that the buckling tectonic regime in the Sechangi area which associated with the Paleogen eastern Iranian orogeny, caused the extension-shear deformations and orientation of refold structures in this area.

Seismic analysis of earth and rockfill dams is generally done in two ways: quasi-static and dynamic. However, a quasi-static method with easy application and simple assumptions may lead to unsafe and uneconomical results. In the present study, two static and dynamic analyzes have been used nonlinearly using the Rayleigh Damping rule to calculate the stress and strain of Azadi Dam in the stages of the end of construction and steady-state seepage. Also, in numerical analysis, Abaqus software and simple elastoplastic behavior model based on the Mohr-Coulomb criterion have been used. The results show that in both quasi-static and dynamic seismic analysis, the highest strain of the Azadi Dam core occurred at the upper levels of the core and the highest stress occurred at the level of the core floor. The stress in the dynamic state is higher than the quasi-static one in the directions σxx 49%, σxy 30%, and σyy 28%. Also, the maximum crust stress on the floor, middle and upper levels is 29%, 68%, and 72% higher than the core, respectively.