Results 71 to 80 of about 1,981,740 (257)

A rock brittleness index based on the postpeak energy release rate and damage surface characteristics for brittle hard rock

Deep Underground Science and Engineering, EarlyView.
This study examines energy evolution in rock rupture via triaxial direct shear tests, exploring the impact of confining pressure and temperature on fracture surface randomness. A novel energy‐based brittleness index is proposed, validated experimentally, and compared with existing methods for reliability and accuracy.
Biao Wang, Zaobao Liu, Jing Xue, Bo Lu, Wei Zeng, Dengke Zhang   +5 more
wiley   +1 more source

City utility tunneling designing method based on “support-rock mass” interaction

Горные науки и технологии, 2018
At present time, megacities face acute problem of construction of tunnels for laying utility networks. In such large cities as Hanoi, Ho Chi Minh, there are still no solutions to the problem of laying technical pipelines, power cables, water supply and ...
Duyen Phong Nguyen, Trung Thanh Dang, Tuan Minh Tran, Van Thinh Nguyen   +3 more
doaj   +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

Module division method considering optimal path weighted resource allocation and closeness centrality for complex products

Advances in Mechanical Engineering
To address the compromised connection independence and structural integrity in module division due to multi-criterion correlation, ambiguous and missing information in complex products, a similarity model based on optimal path weighted resource ...
Yanqiu Xiao, Yixiao Jin, Guangzhen Cui, Zhijun Chen, Jianqiang Jiao   +4 more
doaj   +1 more source

Tunnel boring machine positioning automation in tunnel construction

, 2020
Purpose Tunnel construction using a tunnel boring machine (TBM) entails precise machine positioning and guidance in the underground space. In contrast to traditional laser-based machine guidance solutions, the proposed research aims to develop an ...
Xuesong Shen, Simaan M Abourizk, Ming Lu, Siri Fernando   +3 more
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Application of two non-linear prediction tools to the estimation of tunnel boring machine performance

, 2009
Predicting tunnel boring machine (TBM) performance is a crucial issue for the accomplishment of a mechanical tunnel project, excavating via full face tunneling machine. Many models and equations have previously been introduced to estimate TBM performance
İplikçi, Serdar, Sezer, E., Iplikci, S., Yagiz, S., Gokceoglu, C.   +4 more
core   +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

The Reliability of a Tunnel Boring Machine [PDF]

Greater levels of complexity in tunnelling with Tunnel Boring Machine (TBM) allow higher chances of fail-ures that may increase the potential hazardous risks. This paper presents the results of a study on TBM reliability using risk analysis.
جعفری, محمدجواد, قراری, نورالدین   +1 more
core  

Investigation on the mechanical behavior of the multiple‐layered lining structure of a water conveyance tunnel with high internal water pressure

Deep Underground Science and Engineering, EarlyView.
This study presents large‐scale similarity model testing (geometric ratio 3.6) of an innovative multiple‐layered lining system—comprising exterior precast segments, middle self‐compacting concrete, and an interior steel pipe—for high‐pressure (0.75 MPa) water conveyance tunnels.
Ramin Asadi, Shimin Wang, Chang Liu, Zhiyu Lin, Chuan He   +4 more
wiley   +1 more source

Appropriate Ventilation System for Control of Methane in Tunnels during Construction (A Case Study: Alborz Tunnel [PDF]

Background & Objectives: Different methods can be used for ventilation of tunnel during construction. Each method has advantages, limitations, and disadvantages that should be considered in selection of methods.
مختاری, سیداحمد, حضرتی, صادق, روحي راد, زهرا, جعفری, محمدجواد, عالیقدری, مرتضی, قراری, نورالدین   +5 more
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