Search

Your search keyword '"Shaoming Liao"' showing total 4 results
Start Over Author "Shaoming Liao" Topic finite element method
4 results on '"Shaoming Liao"'

1. Analytical and numerical analysis on the torsional performance of elliptically deformed tunnels in the longitudinal direction.

Author

Yingbin Liu, Shaoming Liao, Mengbo Liu, Lisheng Chen, and Zhiyi Li

Subjects
*TUNNEL design & construction, *BORING machinery, *BENDING moment, *TORQUE control, *FINITE element method
Abstract

Segmental lining structures constructed by shields/tunnel boring machines are often subjected to uneven longitudinal cross-section torsion as a result of eccentric external loads, which is extremely adverse to tunnel safety but has not received sufficient attention for a long time. To figure out the torsional performance of segmental tunnels, it is essential to assess the longitudinal torsional stiffness and active-torsion-rejection capability of a segmented tunnel. The aim of the paper is to derive an analytical solution to the longitudinal torsional stiffness of a segmental tunnel with existing elliptical deformation. The longitudinal torsional stiffness under different internal force combinations is deduced considering the longitudinal axial force and bending moment based on the equivalent continuous model and force balance equation. The validity of the analytical solution is verified by comparing it with finite element method results. Then, a parametric analysis, using the new analytical solution, is included to investigate the effect of the key parameters on torsional behaviors, including the segment size, the bolt size and the transverse bending stiffness, etc. It is found that: (1) the longitudinal torsional stiffness efficiency (LTSE) of the segmental tunnel decreases with the rise of segment thickness to diameter ratio but increases with the ring width to diameter ratio; (2) the LTSE reduces with the increase of the effective shear length but rises with the diameter of bolts; (3) the LTSE increases rapidly with the ratio of compression-torsion or bending-torsion. Furthermore, the envelope curve of the critical load (N0, M0) for a tunnel to actively resist a certain internal torque is given. The proposed solution can be easily utilized to determine the longitudinal torsional stiffness of segmental tunnels and is an effective tool for tunnel design and maintenance. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

2. Parametric Study on the Effect of Deep Excavation on the Adjacent Metro Station in Suzhou

Author

Shifeng Wei, Shaoming Liao, Xiang Li, Yong Tan, and Yanbing Zhu

Subjects
Engineering, business.industry, Slab, Geotechnical engineering, Excavation, Clockwise, business, Rotation, Roof, Finite element method, Parametric statistics, Juncture
Abstract

This paper examines the response of metro stations adjacent to an excavation via a series of comprehensive finite element parametric studies. The effects of several key factors (e.g., the distance, D, between the existing metro station and the deep excavation, the depth of the excavation, He) governing the performance of the metro station were quantified. On the basis of the numerical analysis results, some major findings were obtained: (1) rotation of rail closer to the excavation transformed from the clockwise direction to the anticlockwise direction with the increasing of D / He; (2) as D / He increased, internal structural forces of juncture at roof slab and right wall decreased gradually and excessive internal structural force occurred when D / He was smaller than 0.7; and (3) conventional protection criteria of metro stations were not rational because they did not take into account the internal structural forces.

Published
2013

3. Optimization of bolt-grouting support parameter of soft-rock subway tunnel based on orthogonal design method

Author

Wei-guo Qiao, Mingliang Shen, Shaoming Liao, and Wei Shao

Subjects
Physics, Principle of orthogonal design, Computer simulation, business.industry, Numerical analysis, Grout, Structural engineering, Radius, engineering.material, Finite element method, Line (geometry), engineering, Geotechnical engineering, business, Divergence (statistics)
Abstract

Based on the expected subway tunnel project in Qingdao, bolt-grouting support parameters are optimized by the principle of orthogonal design and ANSYS numerical simulation calculation. The best support program is obtained: the length of bolt is 2.8m; the row & line space of bolt is 0.8×0.8m; the grout divergence radius is 1.5m. The effect extent of the different parameters to the support result is the length of bolt < the grout divergence radius< the row & line space of bolt. The research results serve as a guide for the design of bolt-grouting support for soft-rock subway tunnel.

Published
2011

4. Mitigation of Sheet Pile Movements during DDC by Open Trenches

Author

Yong Tan, Fangle Peng, and Shaoming Liao

Subjects
Engineering, business.industry, Sheet pile, Trench, Geotechnical engineering, Structural engineering, Base isolation, business, Dynamic compaction, Finite element method
Abstract

This paper investigated the effectiveness of open-trench wave barriers in reducing the movements of sheet pile walls during deep dynamic compaction (DDC), by isolating (screening) the energy waves generated in DDC impact. This investigation was achieved by a series of finite element analyses. The open trenches with different cross-section shapes were investigated. The dimensional effects of trenches were analyzed and discussed, and then the isolation efficiencies of the different trenches were compared. The numerical results indicated that excavating an open trench in front of the retaining walls is an effective measure to reduce wall movements during DDC. For the investigated open trenches, increasing trench depth or trench width can efficiently improve their isolation efficiencies, while the cross-section shapes of the trenches have no apparent influences.

Published
2010

Catalog

Books, media, physical & digital resources
See catalog results