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List of products by author: J. Chen
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A comparative study of mountain tunnel subjected to seismic load using 2D and 3D numerical simulations
Abstract: In the 2008 Wenchuan earthquake, more than ten mountain tunnels in operation around the epicenter suffered severe damages. Among all the damaged tunnels, the Longxi tunnel was the most special one which is located at a distance of 2 km from the epicenter of the earthquake. For the seismic design of tunnel structure, an effective simplified approach, two-dimensional finite element model is...
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A new drilling pattern of contour blastholes for overbreak control
Abstract: The problems of overbreak and underbreak exist widely in drilling and blasting tunnels. The traditional contour blastholes (TCB) pattern has disadvantages in controlling overbreak and underbreak due to the impact of the initial support. For example, it generally increases the look-out angle and causes the overbreak. However, its effect is rarely mentioned in previously published studies. Based...
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Brief introduction of the first quasi rectangular shield tunnel in China
Abstract: The form of shield tunnel cross sections has gone through several phases, from rectangular to circular, and then to non-circular. To study the key design and construction techniques of quasi rectangular shield tunnels, Chinese engineers have chosen to build the world’s first quasi rectangular shied tunnel in the construction of one interval of Ningbo Metro Line 3, taking into consideration both...
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Research on a new device used to decrease excess pore water pressure of soil around shield tunnels
Abstract: Grouting is important for shield tunneling as grouting material fills the adverse gap between segments and the surrounding soil. Generally, high grouting pressure will lead to large segment stress. In order to reduce the stress and deformation of segment, extra soil is usually removed behind the segment through a prefabricated hole located in the middle of each segment. However, this method may...
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Simulation on Shield Behaviour at a Sharp Curve by Kinematic Shield Model
Abstract: Due to ongoing development of shield tunneling technologies, usage of more complicated tunnel alignments is increasing. Excavation at a sharper curve needs proper steering of shield machines. Shield behavior is controlled usually by copy cutter, articulation mechanism, and jack force and moment. Then the kinematic shield model, which can take shield operation including the above shield...
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Study on Effect of Excavation of Pit on Its Underlying Metro Tunnel
Abstract: With rapid development of underground rail transport in China, effect of foundation pit excavation on underlaid metro tunnel has been increasingly concerned since the 21st century. The excavation inevitably leads to the upheaval of the tunnel. If the deformation values of tunnel exceed their allowable values, the safe performance of tunnel will be affected. Many scholars carried out some...
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Study on Key Technology of the Shed-tunnel – Design and Construction by Mountain
Abstract: In the planning and construction of mountain highway or road, environmental protection is daily emphasized. The concept of taking action that suits local environment and taking the advantages shall be applied in design. Based on this design idea the necessity for arrangement of shed-tunnel for road by mountain is analyzed and the current situation of application of shed-tunnel all over the...
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Study on numerical simulation of seismic response for underground tunnel across fault
Abstract: Fault fracture zone is the seismic weak link of tunnel structure. Aimed at the dynamic interaction characteristics between surrounding rock and fault under seismic load, a dynamic contact force method considering several contact states is built. Considering point to point and point to surface contact in finite element model, the method can simulate four contact states between the rock and...
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Study on steering method of H and V shield to construct a spiral tunnel
Abstract: Due to limited underground space in urban area and for saving construction cost, multi circular face shield (MF shield) [1] had been innovated to construct a twin tunnel at once. Furthermore, according to the more severe restriction of underground space use, horizontal and vertical variation shield method (H&V shield) [2] was innovated, so that the cross section of a MF shield tunnel is...
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