Modern tunneling projects will often rely on a Tunnel Boring Machines (TBMs) rather than traditional drill and blast (D&B) methods, because of TBMs’ increased tunneling efficiency[1]. TBMs have a circular drill at the front, which can range in diameter from 1 meter to 19.25 meters, depending on the desired use for the completed tunnel. Applications of tunnels dug by TBMs range from underground ...

There is an increasing incidence of overheating in subway tunnels recent years especially old subways without air-conditioning e.g., London Underground. still lack a clear understanding how tunnel-air temperature determined by complex thermal processes tunnels. In this study, mathematical model that describes the deeply buried was developed. Analytical solution derived separating into time-aver...

Road and subway tunnels in soft clay soils subjected to traffic loading often cause lager settlement. It can pose danger the surrounding buildings structures. Hence, it is necessary for engineers correctly predict long-term deformation of saturated foundations under cyclic loading. In this paper, a series dynamic triaxial tests were carried out on Nanning investigate effect frequency stress axi...

This article investigates and presents a case study on the Beijing Subway Line 12 excavation beneath existing Qinghuayuan Tunnel. The composite pre-reinforcement technique was used in conjunction with shallow tunneling method to control distortion of large-diameter tunnel. When building twin tunnels underneath, this strategy considerably decreased impact To systematically mechanical response tu...

The dynamic responses of existing pipelines are great significance to be studied in blasting excavation the arch cover method. In this paper, Shi Kui Subway Station Line 5 Dalian, China, is selected as a case study. A 3D numerical simulation model established analyze dynamics characteristics subjected vibration, with triangular pattern describing blast hole pressure. verified by comparing pipel...

Abstract: In order to analyze the distribution rules and influence of stray current on subway rectangulartunneland subway Shield tunnel, threedimensional models were built separately. By changing the values of carry-current, ansys was used toanalyzeunder different geological conditions.Simulations show that the potential attenuation is nonlinear from the subway tunnel to the surrounding undergr...

Abstract Since the safety and stability of original tunnel structure are easily affected by adjacent foundation pit excavation, it is strongly necessary to study deformation evolution tunnels during excavation. With regard two cases that adjacently located at right bottom pit, influence different supporting methods, including pile support, bolt pile-bolt shotcrete-bolt on was investigated basis...

During the construction of subway tunnels, geotechnical body is affected by excavation to produce three-dimensional spatial deformation. The deformation bodies an important safety hazard for project advancement, so it understand disturbance range and mechanism. current related research mainly about theory land subsidence two-dimensional plane displacement stratum, there are few studies on speci...

The horizontal displacement of the soil at face subway tunnel is symmetrically distributed along central axis tunnel, which larger in middle and smaller both sides. related to size excavation face. If area too great, will be large, easily leading collapse. For this reason, builders often use core-keeping ring-cut method build tunnels. A large section divided into several small sections reduce c...