Results 111 to 120 of about 328,347 (250)

Backward Plasma Acceleration of Aluminum, Copper, Silver, and Tantalum Ions From 1010 up to 1015 W/cm2 Pulse Laser Intensity

Contributions to Plasma Physics, EarlyView.
ABSTRACT Measurements of ion acceleration in laser‐generated plasma obtained at intensities from 1010 up to 1015 W/cm2 using IR laser ablation of aluminum, copper, silver, and tantalum in high vacuum are presented. At low intensity, data were acquired from the MIFT Department of Messina University (Italy) using a Q‐switched Nd:YAG laser operating at ...
L. Torrisi, M. Cutroneo, A. Torrisi
wiley   +1 more source

Influence of ultra-close undercrossing shield on deformation of existing tunnels

Yantu gongcheng xuebao
With continuous development of urban construction in recent years, many Chinese cities have successively developed and increased the construction of urban rail transit projects, and the construction of the metro engineering causes surrounding surface ...
DAI Zhengbin1, 2 , LU Yunlong1, 2
doaj   +1 more source

Motion planning and control of an installation robot for attitude adjustment of arc parts in underground shield tunneling

Deep Underground Science and Engineering, EarlyView.
Inspired by spiders, the multilegged walk‐through assembling robot for arc parts achieves high‐precision synchronous control under heavy loads through dual‐layer hydraulic pose dynamics modeling and hierarchical pressure optimization, significantly enhancing shield tunneling assembly efficiency and precision.
Quan Xiao, Guofei Xiang, Liang Liao, Lai Wei, Hongli Wang, Songyi Dian   +5 more
wiley   +1 more source

Influence of the Diameter Size on the Deformation and Failure Mechanism of Shield Precast Segmental Tunnel Lining under the Same Burial Depth

Buildings
With the development of large-diameter shield tunnels, how to realize effective security and stability control of shield tunnel lining has become a significant research topic.
Jun Zhou, Kaihang Han, Weitao Chen
doaj   +1 more source

Seismic Response of Shield Tunnel with Double-Layer Lining

A shield tunnel is an assembly structure composed of connecting bolts and segments, generally considered to have good seismic performance. However, there is still a possibility of damage occurring in shield tunnels under strong seismic action. Therefore,
Qipeng Cai, Xiangyu Guo
core   +1 more source

Seismic analysis and design of tunnels within fault ground: A review

Deep Underground Science and Engineering, EarlyView.
The research methods of seismic response of tunnels within fault ground, including field investigations, analytical solutions, physical experiments, and numerical simulations, and seismic countermeasures are discussed. The present study examines the shortcomings and limitations of the current research and design, and puts forward proposals for future ...
Xingda Wang, Yujing Jiang, Xuepeng Zhang, Yuyong Jiao, Ningbo Li, Xiao Wang, Bo Li   +6 more
wiley   +1 more source

Health Risk Prediction of Operational Subsea Tunnel Structure Based on Bayesian Network

Buildings
Recently, subsea tunnel construction has developed rapidly in China. The traffic volume of subsea metro tunnels is large. Once a safety accident occurs, economic losses and social impacts will be extremely serious.
Hongmei Ni, Xia Li, Jingqi Huang, Shuming Zhou   +3 more
doaj   +1 more source

Carbon emission assessment of tunnel infrastructures: From construction to operation

Deep Underground Science and Engineering, EarlyView.
This study develops a lifecycle carbon accounting framework for tunnel infrastructures, covering design, construction, operation, maintenance, and dismantling. Applied to a subsea tunnel case, the framework reveals the carbon emission distribution among four typical tunnel types and highlights potential carbon offset methods for low‐carbon tunnel ...
Luyuan Long, Wout Broere, Xuehui Zhang, Tian Xia, Richard de Nijs   +4 more
wiley   +1 more source

Underground Tunnel Development Survey of Shield Tunnelling Machine

, 2011
In this paper, the technology based on site investigation adequately, through reading, analysis and comprehensive vast literature of shield lining segments, installed spelling were analyzed, and the conclusion that some valuable conclusions.
Xue Sen Chang
core   +1 more source

Investigation on tunnel stability considering pipe‐roof support with transparent soil technology

Deep Underground Science and Engineering, EarlyView.
This study integrates transparent soil technology, 3D reconstruction and numerical simulation to captures the full‐field deformation of shield tunnel instability. Results demonstrate that pipe‐roof support enhances stability via the “soil‐arching barrier effect,” effectively restraining failure wedge development by extending stress transfer paths ...
Zhi Jia, Yunpeng Ji, Zhao Lu, Honghua Zhao, Limin Zhang   +4 more
wiley   +1 more source