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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.

Interaction of Sabzkuh tunnel excavation and environment hazard in Zagros zone of Iran
Majid Taromi, Abbas Eftekhari, Jafar Khademi Hamidi, Mahdi Saeidi,
Volume 19, Issue 6 (12-2025)
Abstract
Sabzkuh tunnel is under construction in Iran. During the course of the project feasibility studies, the importance of the environmental impacts was not sufficiently addressed. Only due to the environmental impacts of the construction the tunnel route was changed. However, in the new routing, the tunnel passage through difficult and complex ground conditions, the interaction of tunnel excavation and groundwater resources and springs, and consequently the environment of the region were not given importance. According to the geological model, the new tunnel route faced various geological hazards, the most important of which were crushed zone and faults with water inrush. These risks made it necessary to choose a TBM with high flexibility. With the start of mechanized excavation in 0+484 km, faced with Solaghan fault and the inability of TBM to cross it, caused it to get stuck. Subsequently, water drainage caused the drying up of Aloqareh spring and dehydration of Shirkoshteh spring and negative environmental impacts in the region. In this regard, the release of TBM was done by construction two by Pass galleries. Finally, due to the problems, TBM was taken out of the tunnel and the tunnel excavation was stopped.
 

Numerical analysis and investigation of axial force, shear force and horizontal displacement in underground structures
Masoud Khahanipour, Hossin Sarbaz,
Volume 19, Issue 6 (12-2025)
Abstract
The aim of this study is to numerically analyze the axial force, shear force, and horizontal displacement in the tunnel (Tunnel B on the Pataveh-Dehdasht axis). This tunnel is part of a national project, which was inaugurated and put into operation in the summer of 2023, with technical specifications including 2.2 million cubic meters of earthwork, construction of retaining walls with a total length of 2,100 meters, 110,000 tons of subbase and base layers, and 95,000 tons of asphalt.
In the present study, the effect of tunnel lining thickness on shear force, axial force, and both horizontal and vertical displacements was numerically investigated using the PLAXIS finite element software in a two-dimensional framework. Plane strain theory was employed with 15-node elements for modeling. For the surrounding soil, the Mohr-Coulomb constitutive model, which is one of the fundamental stages in numerical analysis and commonly used in most tunnel excavation simulations, was applied to model the soil behavior of the study site.
The results indicate that increasing the lining thickness reduces both vertical and horizontal displacements at all points, while axial and shear forces increase. The maximum deformation occurs at the tunnel invert, and the minimum occurs at the right-side wall of the tunnel. Increasing the lining thickness from 20 cm to 35 cm leads to an approximately 100% reduction in tunnel floor settlement and a significant decrease in horizontal displacement, exceeding 90% at certain points. The findings highlight that selecting an appropriate lining thickness plays a key role in controlling deformations, enhancing load-bearing capacity, and improving the seismic safety of the tunnel.
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