Abstract We show through laboratory experiments that the self-patterning of a thin clayey layer can be triggered by condensation. The natural sediment used in was highly polydisperse granular paste with smectite clay fine fraction. Under certain physicochemical conditions, condensation induces solid-to-liquid transition layer, resulting flow and formation band structures. These results suggest ...

the effect of underground cavities in site seismic response was studied over the subway tunnels that are under construction in the city of karaj, using ambient noise measurements as well as numerical modeling. the idea for this research comes from the observation of differences in experimental site transfer function, calculated on more than 100 locations of the city, for the areas near the unde...

We have developed and built a highly accurate laser strainmeter for geophysical observations. It features the precise length measurement of a 100-m optical cavity with reference to a stable quantum standard. Unlike conventional laser strainmeters based on simple Michelson interferometers that require uninterrupted fringe counting to track the evolution of ground deformations, this instrument is...

In this research attempts were made to estimate the in-situ stresses acting on a hydrocarbon reservoir based on routine activities of acid injection in oil reservoir. It was found that the relation between the re-opening pressure of fracture and principal in-situ stresses can be estimated using rock mechanics equations for the circular underground cavities. An appropriate relation between the m...

The traditional Three-dimensional (3D) model for stability analysis of a large underground cavern group only includes the main powerhouse, transformer chamber, tailrace surge tank, electrical wire hall, and part diversion tunnel tailwater tunnel. Other caverns excavation are not taken into consideration, which is inconsistent with actual project. In this study, 3D Finite Element Method (FEM) mo...