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List of products by author: J. Rostami
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A new approach for the prediction of TBM penetration rate based on Particle Swarm Optimization (PSO)
Abstract: Artificial intelligence methods have been used in numerous research works to propose a TBM penetration rate prediction model. In this study, a combination of particle swarm optimization (PSO) technique and learning automata is used to propose a TBM penetration rate model. These techniques are used to assess the feasibility of developing a prediction model based on field data collected from...
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A simple precaution for preventing of the lining failures in the tunnelling by the shielded TBMs through squeezing...
Abstract: The use of shield around the TBM allows the machine to pass through weak grounds and adverse geological conditions. However, using the shielded machine limits access to the walls for observation of ground conditions and presence of shield makes the machine susceptible to entrapment or seizure in weak rocks under high stresses which results in high convergence. On the other hand, failure of the...
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Analysis of Rock Mass Based on Rock Characterization by Roofbolt Drilling and 3D Data Visualization in Tunneling
Abstract: 3D visualization of the rock strata and ground conditions for determining the rock mass properties in underground construction, tunneling, and mining is a powerful tool that can help in optimization of ground support design. The required input data can be generated by combining the information obtained through original geotechnical exploration boring and drilling the boreholes such as...
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Analysis of TBM Performance in Two Long Mechanized Tunnels, Case History of Karaj Water Conveyance Tunnel Project...
Abstract: Analysis and assessment of TBM performance during construction and comparing the field performance with the predicted values is important in optimization of tunneling activities. This includes the analysis of rate of penetration and machine utilization factor as the main focus of such studies. This paper offers an overview of TBM performance in Lot 1 and 2 of Karaj water conveyance tunnel...
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Development of a soil abrasion test and analysis of impact of soil conditioning on tool wear for soft ground...
Abstract: In the recent years, Earth Pressure Balance (EPB) shields have been successfully used in many tunnels in urban areas. One of the critical issues for successful EPB tunneling is the use of proper soil conditioning to reduce wear and torque. Among the parameters that can affect tool wear, soil conditioning is the most important one that can be controlled by the operators. Soil conditioning has...
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Emerging Data Processing Technologies in MechanizedTunnelling
Abstract: Programmable Logic Controllers (PLC) or microprocessors are standard features on Tunnel Boring Machines (TBM) to monitor and record various sensory systems providing options for control and automation of machine processes. The data collected from these sensory systems and channelled through PLC is stored for real-time analysis and use by the operators and per typical construction specifications...
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Estimation of Rock Load for Tunnels Excavated in Different Rock Masses
Abstract: Collapses in roof and less frequently in walls and face often take place due to inappropriate estimation of rock load. This study offers a review of the main factors affecting rock load to evaluate the capabilities of the existing models for prediction of ground pressure acting against installed support in underground excavations. Rock mass classifications such as GSI, RMR, as well as tunnel...
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Evaluating suitability of existing rock mass classification systems for TBM performance prediction and...
Abstract: Rock mass classification systems, such as Q and rock mass rating (RMR) are often used in empirical designs practices in rock engineering, such as tunneling, contrasting with their original intended applications. A good example of such cases is estimation of TBM performance in various ground conditions. However, the use of RMR in estimation of TBM penetration rate has had limited success due to...
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Evaluating the possibility of shield jamming in squeezing grounds
Abstract: Excavation of long and deep tunnels by shielded TBMs is a safe, fast, and efficient method of tunneling that mitigates many risks related to ground conditions. However, TBM applications in difficult conditions such as squeezing ground may lead to problems such as shield jamming. For successful tunneling in such conditions, it is essential to study the...
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Experimental investigation on effect of ambient pressure of conditioned soil on tool wear in earth pressure balance...
Abstract: The use of mechanized excavation especially shielded tunnel boring machines (TBMs), has grown rapidly in various soft ground tunneling projects. One of the advantages of mechanized tunneling compared to conventional method is the ability of the machines in coping with various geological conditions. In the recent years, Earth Pressure Balance (EPB) shields have been successfully used in many...
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Logging of Roofbolt Holes for Ground Characterization in Underground Construction
Abstract: Characterization of the ground surrounding the tunnel is the key to improve the safety of tunnels and underground spaces during the construction. While the most common form of rock support at the present is bolting, obtaining information about the ground from the roof bolt drilling could be a logical step. In recent years, manufacturers such as J.H. Fletcher & Co have developed instrumented...
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Performance of Double Shield TBM in Uma Oya Project, Sri Lanka, Lessons Learned
Abstract: Uma Oya Multipurpose Development Project was recently completed in Sri Lanka. This project involves 2 Rolled Concrete Core (RCC) Dams connected through a tunnel by the Drill and Blast method. The water is transferred from the 2nd regulatory dam through a 15.4 km Headrace Tunnel to the top of a 618 m deep drop shaft that feeds the high-pressure water to an underground powerhouse and turbine...
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Soil abrasiveness for EPB-TBM along Tehran metro tunnel line 7, Iran
Abstract: Full-face shielded tunnel boring machines (TBM) including earth pressure balance (EPB) shields have been used almost exclusively for soft ground tunneling because of the many advantages the offer in comparison to the conventional methods. The total number of EPB-TBMs that were utilized for tunneling between 2005 and 2010 is approximately 350 units worldwide as reported by [1]. These machines...
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