Mohammad Reza Zareifard

Estahban Higher Education center · Civil engineering

In this paper, an analytical-numerical method is presented to study the long-term behavior of pressurized tunnels. In this regard, the pressurized tunnel construction is simplified into three stages: tunnel excavation, installation of the lining, and applying the internal water pressure. The rock mass around the tunnel is assumed to obey the viscoe...

In the present study two base isolation systems, i.e. lead-rubber and elastomeric bearings are analyzed and their seismic applicability is compared with reference to a liquid-filled conical elevated container undergoing different ground motions. The drilled shaft system is unlinked either from the base or from the top-mounted bowl by means of dampi...

A submerged floating tunnel (SFT) is propounded as an efficacious alternative to conventional bridges and underground/submerged tunnels for crossing deep waterways. SFT designers must ensure safe margins and develop approaches to prevail a wide range of plausible situations related to transport, wave, natural vibrations etc. to evaluate the structu...

Rock excavation using drill and blast method is commonly used in tunneling world-wide. Drill and blast method has inherent disadvantage of deteriorating surrounding rock mass due to development of a blast-induced damage zone with reduced strength and stiffness parameters and increased permeability. Traditional tunnel analysis adopts same parameters...

The drill and blast method is one of the most widely used techniques for excavation of tunnels in rock masses. The most worrying issue in this method is unfavorable damage induced by blast impact into the surrounding rock mass. The blast-induced damaged zone has a possible influence on the tunnel stability. Therefore, the damage in the rock mass sh...

In tunnels, convergences of sidewalls, roof and floor may be different, because of weight of the failed or plastic rock mass. In this paper, a closed-form analytical solution for a deep tunnel excavated in an elastoplastic rock mass is proposed. Using the proposed solution, the effects of the weight of the plastic or failed region developed around...

Drill and blast method is mostly used method for excavation of tunnels throughout the world. This tunneling method involves the use of explosives. Compared with bored tunneling by Tunnel Boring Machine, blasting generally results in the development of a blast-induced damaged zone around the tunnel boundary. Theoretically, the presence of this zone,...

In definition of the ground response curve for a tunnel, convergences of side wall, roof and floor may be different, because of the weight of the failed or plastic rock mass. In this paper, an analytical-numerical solution of the ground response curve for a tunnel excavated in an elastoplastic strain-softening rock mass considering the gravitationa...

In a pressure tunnel with a permeable lining, development of flow from the tunnel induces seepage stresses in the surrounding ground and the lining. In this paper, an analytical solution for analysis and design of pressure tunnels is presented, based on a generalized effective stress principle. The problem is considered as axial-symmetric, and the...

The excavation impact (e.g. due to blasting, TBM drilling, etc.) induces an excavation damaged or disturbed zone around a tunnel. In this regard, in drill and blast method, the damage to the rock mass is more significant. In this zone, the stiffness and strength parameters of the surrounding rock mass are different. The real effect of a damage zone...

In this paper, an analytical method, for calculating seepage induced stresses and displacements in underwater lined circular pressure tunnels, is developed on the basis of a generalized effective stress law. The problem is considered as axisymmetric, and the lining and rock mass are assumed to be elastic, homogeneous and isotropic. The solution acc...

In a drained underwater cavity, seepage forces and pore-water pressure that develop around the cavity may affect the response of the rock mass. In this paper, a fully analytical solution is proposed for analysis of underwater cavities excavated in elastic-brittle-plastic and Mohr-Coulomb rock material, considering the induced seepage forces under s...

An analytical–numerical solution is proposed in this paper for calculating the mechanical and hydraulic characteristics of underwater tunnels, excavated in an elasto-plastic strain-softening and Hoek–Brown rock material considering strain-dependent permeability. The problem is considered with axial-symmetry condition and thus, the initial stress st...

When an opening is excavated below groundwater table, the groundwater flows into the excavated zone and seepage forces apply to the rock mass surrounding the opening. Such seepage forces significantly affect the elasto-plastic responses of the rock mass based on effective stress law. In this regard, it is recognised that the failure criterion of a...

SUMMARY In this study, a simplified analytical closed-form solution, considering plane strain and axial symmetry conditions, for analysis of a circular pressure tunnel excavated underwater table, is developed. The method accounts for the seepage forces with the steady-state flow and is based on the generalized effective stress law. To examine the e...

A new, elasto-plastic, analytical-numerical solution, considering the axial-symmetry condition, for a circular tunnel excavated in a strain-softening and Hoek-Brown rock mass is proposed. To examine the effect of initial stress variations, and also the boundary conditions at the ground surface, the formulations are derived for different directions...

An analytical solution for the analysis of tunnels below groundwater table in plane strain axisymmetric condition is presented. Seepage body force and secondary permeability of the rock mass due to the mechanical–hydraulic coupling are taken into account. The strain-softening behavior model and Hoek–Brown empirical strength criterion for the rock m...

Some of the authors of this publication are also working on these related projects: Evaluating the axial capacity of helical piles using cone penetration test (CPT) View project Interference effect of two nearby strip footings on rock foundation settlement View project ABSTRACT: Distribution of water pore pressure and seepage flow rate are two sign...