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Showing 143 results for Type of Study: Case-Study
Determining the productivity of dimension stone quarrying by diamond wire cutting to evaluate performance (case study: Mahallat, Hajiabad travertine)
Reza Ahmadi,
Volume 17, Issue 1 (3-2023)
Abstract
In the present study, productivity was determined as one of the most important evaluation criteria for the building stone to cut the different faces of travertine using the diamond wire cutting method. For this purpose, measurements were carried out in two zones named 8E and 8W in the northern region of Mahallat, Hajiabad travertine located in the Markazi Province. These zones were selected because of their greater similarity in terms of geological conditions, physical and mechanical properties of the stone, quarrying facilities, machinery and equipment. In order to achieve the objective, structural studies as joint study were first carried out as a joint study through field observations of fractures, drawing rose diagrams and analyzing them. Then, the productivity of electro deposited type diamond wire cutting was measured on seven blocks in two cutting panels of the 8E zone and 13 blocks in three cutting panels of the 8W zone over a period of 45 working days was measured. The results of the research indicate that the average productivities are 7.09 and 5.71 square meters per hour for the 8E and 8W zones, respectively and the overall average value for the 8E and 8W zones is 6.4 square meters per hour. Based on these results, although the average productivity level in these zones is acceptable, but well below the ideal level (18 square meters per hour). Therefore, the productivity in this area needs to be increased.

Sabzkuh Tunnel Excavation and Its Interaction with Environment Hazards in the Zagros zone, Iran
Majid Taromi, Abbas Eftekhari, Jafar Khademi Hamidi, Mahdi Saeidi,
Volume 19, Issue 3 (12-2025)
Abstract
The Sabzkuh Water Conveyance System was planned as an inter-basin water transfer project in the Sabzkuh region of the Chaharmahal and Bakhtiari province, a tributary of the Karun River. Initially, the project included a diversion dam, an open canal, and a tunnel. However, in the initial feasibility studies, the potential environmental risks to the Choghakhor lagoon, ecosystem and regional groundwater resources were not given sufficient consideration.Only due to land acquisition problems in the Chahartagh forest area, the tunnel route was changed and the channel was also removed. Consequently, the project was scaled down to comprise only a diversion dam and a 11-kilometre-long tunnel. This is while the geological and environmental risks of the project area were not fully investigated in the selection of the final route. After 484 meters of excavation, the Solaqan fault was encountered and a sudden inrush of water with a flow rate of 100 liters per second and the liquefaction of the excavation front caused the TBM to get stuck. Subsequently, the drainage of water caused the drying of the Aloqareh spring and the depletion of the Shirkoshteh spring, and negative environmental and social consequences for the region. To release the TBM, two side galleries were constructed and grouting and drainage were carried out. Ultimately, the tunnel excavation operation was stopped due to the problems that arose. The challenges that arose in this project indicate the need for a comprehensive study and planning in the selection of the route and TBM, as well as environmental, economic and social assessments at all stages and examining their interaction with each other.

Numerical analysis and investigation of axial force, shear force and horizontal displacement in underground structures (case study: pataveh-Dehdasht tunnel)
Masoud Khahanipour, Hossein Sarbaz,
Volume 19, Issue 4 (12-2025)
Abstract
This study aims to numerically analyze the axial force, shear force, and horizontal displacement in Tunnel B on the Pataveh-Dehdasht axis. The tunnel is part of a national project that was inaugurated in the summer of 2023. The project's technical specifications include 2.2 million cubic meters of earthwork, 2,100 meters of retaining walls, 110,000 tons of subbase and base layers, and 95,000 tons of asphalt. This study investigated the effect of tunnel lining thickness on shear force, axial force, and horizontal and vertical displacement using PLAXIS finite element software in a two-dimensional framework. Plane strain theory was employed with 15-node elements for modeling. The Mohr-Coulomb constitutive model, one of the fundamental stages in numerical analysis and a common model for tunnel excavation simulations, was applied to model the soil behavior of the study site. The results indicate that increasing the lining thickness reduces vertical and horizontal displacement at all points while increasing axial and shear forces. Maximum deformation occurs at the tunnel invert and minimum deformation occurs at the right sidewall of the tunnel. Increasing the lining thickness from 20 cm to 35 cm leads to a reduction of approximately 100% in tunnel floor settlement and a significant decrease in horizontal displacement exceeding 90% at certain points. These results demonstrate the importance of selecting an appropriate lining thickness for controlling deformations, enhancing load-bearing capacity, and improving the tunnel's seismic safety.

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