Results 111 to 120 of about 57,058 (352)

Impact of Interval Shield Tunneling on Under-construction Mined Tunnels

Chengshi guidao jiaotong yanjiu
ObjectiveThrough numerical simulation，the mechanical impact of interval shield tunneling on adjacent under-construction mined tunnel is evaluated. MethodBased on ANSYS finite element analysis software，a mechanical model of a newly constructed shield ...
Yang ZHAO, Yiheng ZHAO
doaj   +1 more source

Analytical solution for equivalent stiffness of shield tunnels under combined action of longitudinal channel steel and axial force

Yantu gongcheng xuebao
To accurately and quickly predict the effects of longitudinal channel steel reinforcement technology on the equivalent stiffness of a shield tunnel, the theoretical researches are conducted on the longitudinal channel steel reinforcement technology.
JIANG Xuehui 1, 2, YAN Jianwei 1, LUO Wenjun 1, LIU Tianyu 1, XU Changjie 1
doaj   +1 more source

Orchard netting impacts on biodiversity leading to cascading effects at the ecosystem level

Biological Reviews, EarlyView.
ABSTRACT Agriculture must ensure food production without further compromising the ecosystem functions upon which it depends. Agricultural practices should therefore avoid harming farmland biodiversity, especially of taxa that supply the key ecosystem services (e.g.
Corrado Alessandrini, Karan Sethi, Emanuela Granata, Ekaterina Mogilnaia, Valeria Vitangeli, Giovanni Zanfei, Chiara Fedrigotti, Paolo Biella, Dino Scaravelli, Luigi Marchesi, Péter Batáry, Diego Rubolini, Paolo Pedrini, Mattia Brambilla   +13 more
wiley   +1 more source

Experimental Verification on Stiffness Effective Rate for Shield Tunnel 3D Printing Model

Chengshi guidao jiaotong yanjiu
［Objective］ In order to explore the feasibility of 3D printing technology in making tunnel models, it is necessary to determine the effective rate values of the shield tunnel longitudinal and lateral stiffness.
CHEN Li, LI Bo, LU Sheng’an, ZHANG Haitao, LYU Yanhao   +4 more
doaj   +1 more source

A theoretical and experimental investigation of cylindrical electrostatic probes at arbitrary incidence in flowing plasma [PDF]

The theory for calculating the current collected by a negatively biased cylindrical electrostatic probe at an arbitrary angle of attack in a weakley ionized flowing plasma is presented.
Jenkins, R. V., Jones, W. L., Jr.
core   +1 more source

Matrix‐Free Afterglow Carbon Dots: Synthetic Strategies, Luminescence Mechanisms, and Emerging Applications

Carbon Innovation, EarlyView.
This review systematically elucidates the luminescence mechanism, synthesis methods of matrix‐free afterglow carbon dots, and their application progress in information encryption, light‐emitting diodes, sensing, bioimaging, and tumor treatment, and finally, discusses the current challenges and future development directions. ABSTRACT Afterglow materials,
Yupeng Liu, Xiangxin Sun, Zhiqi Cai, Hanyi Zhang, Yiming Hao, Songnan Qu   +5 more
wiley   +1 more source

Ground settlement and tunnel response due to twin-curved shield tunnelling in soft ground with small clear distance

Journal of Rock Mechanics and Geotechnical Engineering
Twin curved tunnels are often encountered in shield tunnelling, where significant complexities in densely exploited underground space are observed. In this study, the ground settlement and tunnel deformation due to twin-curved shield tunnelling in soft ...
Yao Hu, Haoran Tang, Yinggang Xu, Huayang Lei, Peng Zeng, Kai Yao, Yabo Dong   +6 more
doaj   +1 more source

Design and preliminary test results at Mach 5 of an axisymmetric slotted sound shield [PDF]

The basic theory and sound attenuation mechanisms, the design procedures, and preliminary experimental results are presented for a small axisymmetric sound shield for supersonic wind tunnels. The shield consists of an array of small diameter rods aligned
Beckwith, I. E., Harvey, W. D., Spokowski, A. J., Stainback, P. C.   +3 more
core   +1 more source

Study on the failure mechanism of the shield excavation face in the sandy cobble stratum under different buried depths

Deep Underground Science and Engineering, EarlyView.
Abstract One of the significant challenges faced in shield tunnel construction is the risk of collapse resulting from abrupt changes in soil conditions in advance of the working face, particularly within the sandy cobble stratum. This study aims to effectively manage these sudden variations and to further investigate the failure mechanisms associated ...
Hua Jiang, Chongyang Liu, Ao Zhang, Xiaoyan Zhang, Yuhang Li   +4 more
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