The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Kikuo Matsui - One of the best experts on this subject based on the ideXlab platform.
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Small diameter Tunnel Excavation method using slurry pipe-jacking
Geotechnical and Geological Engineering, 2004Co-Authors: Hideki Shimada, Saeid Khazaei, Kikuo MatsuiAbstract:In order to protect the safety of workers construction, as well as for environmental and cost reasons, efficient small-diameter shallow Tunneling methods have recently become increasingly important in regards to outside plant engineering such as for water supplies, electricity, telecommunications and gas. The effects of the above projects in overcrowded urban areas are significant and often result in substantial impact and traffic delays associated with a loss of travel time. Clearly the solution to these utility placement problems, if the full impact of trench Excavation is to be avoided, is trench less technology. In particular, for construction work near existing facilities, underground Tunnels that are excavated by slurry pipe-jacking are being increasingly employed in order to avoid problems. Slurry pipe-jacking was firmly established as a special method for the non-disruptive construction of the underground pipelines of sewage systems. Pipe-jacking, in its traditional form, has occasionally been used for short railways, roads, rivers, and other projects. Basically the system involves the pushing or thrusting of a drivage machine through concrete pipes ahead of jacks. This method utilizes mud slurry that is formed around the pipes in order to stabilize the surrounding soil. Moreover, in recent years, the rectangular shape of the concrete pipe in using slurry pipe-jacking was introduced due to the effective uses of the space. Based on his reason, the rectangular shape of the concrete pipe is often adopted in Japan. From this point of view, this paper discusses the effect shapes have on the stability of surrounding soil by means of the numerical analysis. Secondly, this paper discusses the performance of the mud slurry around the drivage pipes by means of the two-dimensional Eulerian-Lagragian seepage analysis. Moreover, in slurry pipe-jacking, the performance of the mud slurry plays an important role in the pushing process. Finally, the thrusts in slurry pipe-jacking can be predicted accurately by evaluating the resistance between the mud slurry and the concrete pipes and the resistance between the soil and the pipes in the curved jacking area.
Paul Bardunias - One of the best experts on this subject based on the ideXlab platform.
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queue size determines the width of Tunnels in the formosan subterranean termite isoptera rhinotermitidae
Journal of Insect Behavior, 2010Co-Authors: Paul BarduniasAbstract:We present a model of Tunnel Excavation by termites that requires no pheromone labeling of soil or work sites, but instead relies on tactile interactions and individuals who actively orient their movement. Potential termite excavators moved from the Tunnel origin towards the distal end of the Tunnel and formed a queue behind those termites at the digging face. Delayed termites excavated soil laterally from the Tunnel wall at a position governed by their position in the queue of termites. By examining Excavation under artificially induced conditions of longer and shorter queues of termites at the Tunnel end, we showed that Tunnel width increased with increased queue size and the rate of lateral Excavation in a process we termed “digging pressure.”
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individual task load in Tunnel Excavation by the formosan subterranean termite isoptera rhinotermitidae
Annals of The Entomological Society of America, 2009Co-Authors: Rouling Yang, Paul BarduniasAbstract:To study individual participation in Tunneling Excavation, each of 27 workers (plus three soldiers) of Coptotermes formosanus Shiraki (Isoptera: Rhinotermitidae) was identified with a unique marker and released in a two-dimensional arena provisioned with moistened sand, and their time budgets in Excavation were recorded by a camcorder. We found that ≈20% of workers were excavating at any given time. Termites did not work in shifts, and only one or two specific individuals Tunneled continuously throughout the 4-h observation. The majority spent <1 h in Tunnel Excavation, and ≈16% of workers never excavated sand. A positive correlation was found between Excavation time and worker's antennal segment count which refers to a worker's age. However, a large variation in Excavation time also was recorded among workers with same antennal segment number. Thus, worker age might not be the only determining factor for Tunnel Excavation load in the Formosan subterranean termite.
Zongqing Zhou - One of the best experts on this subject based on the ideXlab platform.
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model test study on vibration blasting of large cross section Tunnel with small clearance in horizontal stratified surrounding rock
Tunnelling and Underground Space Technology, 2019Co-Authors: Shuguang Song, Shaoshuai Shi, Zongqing Zhou, Zhenhua Liu, Chengshun Shang, Haozheng SunAbstract:Abstract During the construction process of Excavation blasting in small clearance Tunnel, the blasting vibration inevitably disturbs and damages the interlaid rock and influences the stability. A large-scale three-dimensional Tunnel Excavation simulation test system is designed and developed. The system includes the monitoring system and the test bench which is composed of steel members, reaction frame and hydraulic loading device. Based on the system and portable electric spark source, the dynamic response disciplinarian of the interlaid rock of large cross-section Tunnel with small clearance during Excavation is studied. The results indicate that the blasting process during the backward Tunnel Excavation has a greater influence on the stability of the interlaid rock, yet the surrounding rock at the skewback of the Tunnel had a low sensitivity to Excavation blasting vibration and is affected by the blasting process for a long time. The research methods and results will guide similar engineering.
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analysis on the precursor information of water inrush in karst Tunnels a true triaxial model test study
Rock Mechanics and Rock Engineering, 2019Co-Authors: Chenglu Gao, Zongqing Zhou, Meixia Wang, Yongcai Yuan, Jing WangAbstract:Water inrush in karst Tunnels usually results in casualties, equipment damage, project delays and other serious consequences. An important measure to ensure the safety of Tunnel construction is to provide accurate prediction of water inrush during Tunnel Excavation. To study the stability of the surrounding rock under effect of a water-bearing cave in front of the Tunnel face, a true triaxial geomechanical model test was carried out based on the engineering background of the Xiema Tunnel in Chongqing Province. The response regularities of multivariate physical information of the surrounding rock during rock failure and water inrush were obtained by monitoring the displacement, stress and seepage pressure of different monitoring sections. The results show that some internal connections exist among the kinds of physical information. When the Tunnel face was adjacent to the disaster source, the change of displacement and stress was in a decreasing trend, and the seepage pressure increased first and then decreased during the Tunnel Excavation. In addition, by fusion analysis, the sensitivity priority of precursor information for a rock failure and water inrush disaster in karst Tunnels was summarized as stress, displacement and seepage pressure. Finally, the theoretical basis of the prediction of water inrush in karst Tunnels had been established, which proved the feasibility of predicting disasters according to the precursor information.
Janko Logar - One of the best experts on this subject based on the ideXlab platform.
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use of automatic target recognition system for the displacement measurements in a small diameter Tunnel ahead of the face of the motorway Tunnel during Excavation
Sensors, 2008Co-Authors: Jure Klopcic, Tomaž Ambrožic, Ales Marjetic, Sonja Bogatin, Bostjan Pulko, Janko LogarAbstract:During construction of the Sentvid Tunnel a unique opportunity arose to measure the 3D displacements ahead of the motorway Tunnel Excavation face, since the exploratory Tunnel was already constructed in the axis of the main Tunnel. According to reviewed literature such measurements had not been performed yet and several problems regarding equipment and complete scheme of the experiment needed to be overcome. The paper gives a brief description of the Sentvid Tunnel project, presents significant factors that affected the choice of the geodetic equipment and describes the scheme of the experiment. A special attention is focused on the problems relating to the operation of the instrument in demanding environmental conditions (water, dust).
Hideki Shimada - One of the best experts on this subject based on the ideXlab platform.
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Small diameter Tunnel Excavation method using slurry pipe-jacking
Geotechnical and Geological Engineering, 2004Co-Authors: Hideki Shimada, Saeid Khazaei, Kikuo MatsuiAbstract:In order to protect the safety of workers construction, as well as for environmental and cost reasons, efficient small-diameter shallow Tunneling methods have recently become increasingly important in regards to outside plant engineering such as for water supplies, electricity, telecommunications and gas. The effects of the above projects in overcrowded urban areas are significant and often result in substantial impact and traffic delays associated with a loss of travel time. Clearly the solution to these utility placement problems, if the full impact of trench Excavation is to be avoided, is trench less technology. In particular, for construction work near existing facilities, underground Tunnels that are excavated by slurry pipe-jacking are being increasingly employed in order to avoid problems. Slurry pipe-jacking was firmly established as a special method for the non-disruptive construction of the underground pipelines of sewage systems. Pipe-jacking, in its traditional form, has occasionally been used for short railways, roads, rivers, and other projects. Basically the system involves the pushing or thrusting of a drivage machine through concrete pipes ahead of jacks. This method utilizes mud slurry that is formed around the pipes in order to stabilize the surrounding soil. Moreover, in recent years, the rectangular shape of the concrete pipe in using slurry pipe-jacking was introduced due to the effective uses of the space. Based on his reason, the rectangular shape of the concrete pipe is often adopted in Japan. From this point of view, this paper discusses the effect shapes have on the stability of surrounding soil by means of the numerical analysis. Secondly, this paper discusses the performance of the mud slurry around the drivage pipes by means of the two-dimensional Eulerian-Lagragian seepage analysis. Moreover, in slurry pipe-jacking, the performance of the mud slurry plays an important role in the pushing process. Finally, the thrusts in slurry pipe-jacking can be predicted accurately by evaluating the resistance between the mud slurry and the concrete pipes and the resistance between the soil and the pipes in the curved jacking area.
