evaluation of rock mass deformability

One of the most important effective parameters in design of engineering structures is deformability of rock mass. Benchmark of rock mass deformability is the deformation modulus that directly or indirectly obtained. Since the determination of rock mass deformation modulus indirect method by in-situ tests is time-consuming, costly and difficult from executive operations aspect, so it’s correctly estimation indirectly is important. In this project, in addition to the describing of rock mass of Ruodbar Lorestan pumped storage cavern with the rock mass index (RMi), the dilatometer tests in exploratory gallery around the storage cavern is simulated with numerical method. In the Roudbar storage cavern addition to bedding, three joint sets along with the fault areas in rock mass are observed. Therefore, assuming of the equivalent continuum environment from the finite difference method (FLAC 3Dsoftware) is used for numerical modeling of the dilatometer test. The deformation modulus also has been estimated by RMi experimental method. Investigations are indicative about 51 percent difference between experimental method and in-situ test results.