A.H. Rezaei

Azarbaijan Shahid Madani University | AUSM · Department of Civil Engineering

The study investigated the behavior of walls reinforced by screw and grouted nails in both sandy and clayey soils, along with examining the interaction between screw nails and the surrounding soil. Results indicated that the cylindrical mechanism of screw nails diminishes the influence of soil-shaft interaction on pullout resistance. Abaqus/Standar...

Ground settlement is one of the inevitable consequences of the excavation of shallow tunnels (both mechanized and NATM) in soft soils such as soil materials. This phenomenon is taken place due to the disruption of the initial stress distribution of the ground, which occurs because of the removal of materials during the tunnel excavation. Predicting...

Tabriz, one of the metropolises of Iran, has a particular geotechnical condition. Recently, it has been reported that some of the new structures are tilted in Freshteh town located in the northwest of Tabriz. Different thicknesses of the first subsurface layer, the high level of ground water, and the presence of sand layers between the clay layers...

Using renewable energy sources instead of fossil fuels is a fundamental way to reduce environmental pollution caused by greenhouse gases. Geothermal energy is available all over the world and has an important role in the supply of renewable energy. In order to collect geothermal energy various heat exchanger systems have been developed in recent ye...

Urban development and rapid extension of cities have been accompanied by considerable growth in excavation projects. Soil nail walls have been found to be an economical solution to many soil reinforcement and excavation support problems. To overcome some of the intrinsic problems with the conventional grout soil nails, screw soil nails were develop...

Urban development and rapid extension of cities have been accompanied by considerable growth in mechanized tunneling. Commonly precast concrete segments are used as a tunnel lining which constitutes a relatively considerable part of tunnelling cost. The Optimum design of lining that decreases tunnelling cost, especially in tunnels with large diamet...

Land subsidence can be counted as a vital concern for human beings due to its harmful effects. Overusing water and soil resources, which can threaten nature and human life, is considered as one of the main reason for some natural hazards like land subsidence. Regarding the land subsidence's risk as well as the fact that the reduction of groundwater...

In road construction projects, due to the high volume of soil materials, the costs of supplying and transporting high-quality materials are very high, they may also include the crossing between different geotechnical lands with different types of soils and soil stabilization used to modify resistance characteristics of soil materials in different l...

The load entering from the ground surrounding on the tunnel's lining is one of the effective parameters in the designation of a tunnel. The amount of this parameter, which is called Rock load in a rocky environment, depends on several factors such as th e overburden thickness, geological and geomechanical conditions and the depth of tunnel. In the...

A case study including monitoring data of surface settlements induced by tunneling in Tabriz metro line 2 is presented. This study focuses on about 4.6 km EPB-TBM tunneling works from west depot to S5 Station, where the tunnel was being excavated in sandy and fine grained alluvial, generally below the water table. Although volume loss (VL) has an i...

In this paper measured settlements of Tabriz Urban Railway line 2 (TUR2) are presented. TUR2 with a length of about 22 km will connect eastern part of the city to its western part. The process of excavating TUR2 has begun since 2015, using earth pressure balanced (EPB) TBM with a cutting-wheel diameter of 9.49 m and a steel shield with external dia...

A case study of monitoring and analysis of surface settlement induced by tunneling of Tabriz metro line 2 (TML2) is presented in this paper. The TML2 single tunnel has been excavated using earth pressure balanced TBM with a cutting-wheel diameter of 9.49 m since 2015. Presented measurements of surface settlements, were collected during the construc...

Drilling long tunnels is usually done in a mechanized form and using tunnel-boring machines (TBM). One of the most important factors in drilling these tunnels is the abrasive effect of soil and rubble on cutting machines and other parts of TBM, which can result in a significant reduction in efficiency of drilling project. Numerous methods have been...

Tabriz City, a major metropolis in Iran, presents distinctive geotechnical conditions. The fine-grained soil layers and elevated groundwater levels in the northeastern region of Tabriz have resulted in structural damage. Newly constructed buildings in Fereshteh Town have exhibited unbalanced settlement in recent years. This research evaluates the g...

The need for the development of the urban underground transport network is increasing in modern cities. Nowadays, to excavate metro tunnels in urban areas, earth pressure balanced-tunnel boring machines (TBM-EPB) are widely employed limiting ground and building deformations. Nevertheless, inevitable ground movements in the surroundings of the tunne...

به دلیل توسعه شهرها و کاهش اراضی موجود، شبکه های زیرزمینی همچون مترو جایگزین شبکه¬های حمل و نقل موجود می شود. در ساخت تونل-های شهری به طور عمده از تونل سازی مکانیزه استفاده می شود. عدم تعادل فشار نگهدارنده دستگاه TBM با فشار خاک و آب اطراف، باعث ناپایداری یا ریزش جبهه تونل می شود. برآورد فشار لازم برای نگهداری جبهه کار تونل، یکی از مهمترین عوامل حف...

In order to Compare efficiency of different empirical and analytical methods for defining face support pressure, in 41 sections perpendicular to tunnel center line with horizontal intervals of 50m, face pressures were calculated by means of these methods. In 2 sections FE 3D models were generated and analyzed. Surface settlements have been recorded...

The need for rapid construction of the tunnel, along with the safety of surface structures, has increased the use of mechanized tunnel boring machines in the urban environment. This paper introduces shield-mechanized tunneling as a contemporary tunneling method. The subsequent section presents the working mechanism of the TBM-EPB, which is the most...

Estimating the pressure required to support the tunnel face is one of the most important factors regarding safe and optimal excavation using mechanized tunnel boring machines in urban areas. Applying a pressure more or less than the balance to the face would cause collapse and blow out in the tunnel face respectively. This pressure depends on sever...

The current research is based on numerical finite elements through (ABAQUS) software. To evaluate the behavior of micro piles an example of a micro pile is analyzed under static loading where the soil is considered as a continuous area with Mohr-Coulomb model and micro piles are supposed to be concrete with steel chamber and reinforced with elastic...

Urban development and rapid extension of cities have been accompanied by a considerable growth in mechanized shield tunnelling. Commonly precast concrete segments are used as tunnel lining which comprises relatively considerable part of tunnelling cost. The optimum design of lining needs to an accurate evaluation of loads acting on the lining. In t...

Urban development and the increasingly growth of population have been accompanied by a considerable growth in mechanized shield tunnelling. Commonly precast concrete segments are used as a tunnel lining which constitutes relatively considerable part of tunnelling cost. Optimum design of lining that decreases tunnelling cost needs an accurate evalua...

A physical modelling of low-energy dynamic compaction (DC) on fine, dry loose sand based on image processing (PIV method) was undertaken. Tamping was executed by rising and dropping semi-cylindrical steel tampers of known diameters and weights on the surface of sand deposit. The effective factors of DC and the deformation pattern of sand after tamp...