Three-dimensional numerical simulation of a mechanized twin tunnels in soft ground

This paper presents a case history of the successful application of observational method to instruction microtunneling with successive pipe-jacking. The microtunneling project is the construction of four parallel pipes under Guan River in Jiangsu, China. Four parallel tunnels with external diameter of 4,160 mm and horizontally spaced at 4.8 m apart were jacked over 450 m in cemented silty clay and sand by two slurry-balance microtunnel boring machines (MTBM) at a depth of 4.6 m under the river bed. Since the overburden soil is very thin, proper control of tunneling operations was of utmost importance for maintaining the stability of the river bed. In order to optimize the operation parameters prior to construction under the river bed, a field trial was conducted, which included measurement of ground surface settlement, subsurface settlement, and lateral displacement of the subsurface soils, as well as excess pore water pressure and earth pressure. The relationship between ground response and const...

Ground Response to Multiple Parallel Microtunneling Operations in Cemented Silty Clay and Sand

\n High-speed railway aerodynamics is the key basic science for solving the bottleneck problem of high-speed railway development. This paper systematically summarizes the aerodynamic research relating to China’s high-speed railway network. Seven key research advances are comprehensively discussed, including train aerodynamic drag-reduction technology, train aerodynamic noise-reduction technology, train ventilation technology, train crossing aerodynamics, train/tunnel aerodynamics, train/climate environment aerodynamics, and train/human body aerodynamics. Seven types of railway aerodynamic test platform built by Central South University are introduced. Five major systems for a high-speed railway network—the aerodynamics theoretical system, the aerodynamic shape (train, tunnel, and so on) design system, the aerodynamics evaluation system, the 3D protection system for operational safety of the high-speed railway network, and the high-speed railway aerodynamic test/computation/analysis platform system—are also introduced. Finally, eight future development directions for the field of railway aerodynamics are proposed. For over 30 years, railway aerodynamics has been an important supporting element in the development of China’s high-speed railway network, which has also promoted the development of high-speed railway aerodynamics throughout the world.

Review of research on high-speed railway aerodynamics in China

Multi-objective optimization for limiting tunnel-induced damages considering uncertainties

Analytical prediction for ground movements and liner internal forces induced by shallow tunnels considering non-uniform convergence pattern and ground-liner interaction mechanism

Ground movement prediction for tunnels using simplified procedure

A study of the influence of bogie cut outs' angles on the aerodynamic performance of a high-speed train

The effect of bogie fairings on the slipstream and wake flow of a high-speed train. An IDDES study

Investigation of bogie positions on the aerodynamic drag and near wake structure of a high-speed train

The effect of ground clearance on the aerodynamics of a generic high-speed train

Jiabin Wang

Papers

Ground movement prediction for tunnels using simplified procedure

A study of the influence of bogie cut outs' angles on the aerodynamic performance of a high-speed train

The effect of bogie fairings on the slipstream and wake flow of a high-speed train. An IDDES study

Investigation of bogie positions on the aerodynamic drag and near wake structure of a high-speed train

The effect of ground clearance on the aerodynamics of a generic high-speed train