Results 81 to 90 of about 31,564 (295)

Failure characteristics and the energy criterion of rock with a through‐going joint under true‐triaxial unloading conditions: Insights from the DEM model

Deep Underground Science and Engineering, EarlyView.
The rock failure mode is significantly influenced by the contributing factors, such as the joint inclination, the initial confining pressure, and the unloading point. We found six typical rock failure modes after a large number of numerical tests. Abstract Excavation unloading damages rock masses, with preferential failure along geological defects in ...
Fei Liu, Changhui Liang, Sijia Liu, Yongjun Zhang, Luo Wang   +4 more
wiley   +1 more source

Influence of a Frame Structure Building Demolition on an Adjacent Subway Tunnel: Monitoring and Analysis

Buildings
In a complex urban environment, the impact of building demolitions by blasting on the structural integrity of nearby metro tunnels is critical. This study systematically analyzed the blasting and demolition process of a building adjacent to a metro ...
Wei Wang, Xianqi Xie, Fang Yuan, Peng Luo, Yue Wu, Changbang Liu, Senlin Nie   +6 more
doaj   +1 more source

Geological and geotechnical challenges on the Great Dyke of Zimbabwe and their impact on hardrock pillar design

Deep Underground Science and Engineering, EarlyView.
The Great Dyke of Zimbabwe is notable for its rich platinum group metal deposits but poses significant geological and geotechnical challenges due to its complex rock types and structural features. Traditional pillar design methods are insufficient for addressing these complexities; the study suggests incorporating advanced techniques such as machine ...
Tawanda Zvarivadza, Hendrik Grobler, Moshood Onifade, Manoj Khandelwal   +3 more
wiley   +1 more source

Stratum Deformation Characteristics Analysis of Underground-excavated Metro Tunnel in Construction Waste Backfill Layer

Chengshi guidao jiaotong yanjiu
Objective There are more and more cases of metro tunnel engineering crossing through miscellaneous fill strata featured by high porosity, low strength, and easy deformation, resulting in unclear land subsidence mechanism of the above metro tunnel ...
Wei CUI, Weize SUN
doaj   +1 more source

A Review of Rail Research Relevant to the Case for Increased Rail Investment. [PDF]

, 1993
The purpose of this paper is to provide a review of rail transport research which has a bearing on the case of increased rail investment. The paper focuses on research which has been conducted on the demand for rail travel, both passenger and freight ...
Fowkes, A.S., Hopkinson, P.G., Nash, C.A., Preston, J.M., Wardman, M.   +4 more
core  

Real‐time monitoring of tunnel structures using digital twin and artificial intelligence: A short overview

Deep Underground Science and Engineering, EarlyView.
How artificial intelligence (AI) and digital twin (DT) technologies are revolutionizing tunnel surveillance, offering proactive maintenance strategies and enhanced safety protocols. It explores AI's analytical power and DT's virtual replicas of infrastructure, emphasizing their role in optimizing maintenance and safety in tunnel management.
Mohammad Afrazi, Danial Jahed Armaghani, Hossein Afrazi, Hadi Fattahi, Pijush Samui   +4 more
wiley   +1 more source

Designing and Operating Safe and Secure Transit Systems: Assessing Current Practices in the United States and Abroad, MTI Report 04-05 [PDF]

, 2005
Public transit systems around the world have for decades served as a principal venue for terrorist acts. Today, transit security is widely viewed as an important public policy issue and is a high priority at most large transit systems and at smaller ...
Cavanagh, Ellen, Cherry, Christopher, Fink, Camille, Haas, Peter J, Liggett, Robin, Loukaitou-Sideris, Anastasia, Taylor, Brian D., Wachs, Martin   +7 more
core   +1 more source

Temperature‐dependent shear behavior and constitutive model of the rock–concrete interface

Deep Underground Science and Engineering, EarlyView.
Shear tests were conducted to investigate the temperature‐dependent shear behavior of the rock–concrete interface, highlighting the interaction between the surrounding rock and the lining during tunnel fires. Under experimental conditions, concrete exhibited greater temperature sensitivity than rock, with the shear fracture surface transitioning from ...
Hongbin Chen, Yujing Jiang, Rui Pan, Bin Wang, Sunhao Zhang, Jinge Zhang, Xianzhuang Ma   +6 more
wiley   +1 more source

Investigation on foundation pit uplift mechanism and tunnel response induced by deep excavation under complex support system: A case study

Underground Space
Pit excavation work often occurs directly above metro tunnels, causing adverse effects on the underlying existing operational shield tunnel. Current simplified solutions mainly adopt stress release method to reflect excavation of foundation pit, which is
Zhiguo Zhang, Jian Wei, Junjie Li, Linlong Mu, Wei Wo, Yin Ni   +5 more
doaj   +1 more source

The Price of Inaction: An Analysis of Economic Impacts Associated with SEPTA's FY 2008 Operating Budget "Plan B" Alternative [PDF]

, 2007
As of May 2007, SEPTA has a budget shortfall of $129.6 million. Without a source of funding that can balance the transit organization's budget this summer, SEPTA would be forced to implement "Plan B," which would cut service by 20 percent and increase ...

core