Results 11 to 20 of about 48,608 (309)

Pilot project: applying the Tunnel-in-Tunnel method on DB electrified routes [PDF]

E3S Web of Conferences, 2023
This report deals with the refurbishing of the Petersberg Tunnel. In this connection, for the first time within the scope of the pilot project, the tunnel-in-tunnel method was applied on an electrified line belonging to the DB.
Mähner Dietmar
doaj   +1 more source

Model Test and Numerical Simulation Study on the Effect of Mudcake and Length-Diameter Ratio on the Bearing Capacity of Bored Cast-in-Place Piles

Advances in Civil Engineering, 2022
To study the effect of length-diameter ratio and mudcake on the bearing capacity of bored cast-in-place piles, the indoor model test and finite element numerical simulation method were used to carry out the loading test of piles under different mudcake ...
Peisheng Xi, Mengxuan Kan, Yang Liu
doaj   +1 more source

Structural Design and Numerical Analysis of an All-Metal Screw Motor for Drilling Applications in High-Temperature and High-Pressure Environments in Ultra-Deep Wells

Applied Sciences, 2023
It is difficult to adapt traditional screw motors with rubber stators to the high-temperature and high-pressure conditions in ultra-deep wells, where rubber stators age, deform and carbonize, resulting in motor failure.
Xin Fang, Chuo Zhang, Cong Li, Ling Chen, Jianan Li, Xun Yang, Heping Xie   +6 more
doaj   +1 more source

Abnormal variation of P-wave velocity of red sandstone after cyclical thermal shock in water

Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2023
Hot dry rock (HDR) has great development potential because of its advantages of clean, environmental protection and renewable. The study of physical and mechanical properties of HDR is one of the important links in the process of geothermal energy ...
Jianjun Hu, Heping Xie, Mingzhong Gao, Xiting Long, Qiang Sun, Cunbao Li   +5 more
doaj   +1 more source

Carbonation Depth Model and Prediction of Hybrid Fiber Fly Ash Concrete

Advances in Civil Engineering, 2020
The concrete is weakly alkaline, the alkalinity of the concrete will be reduced after being carbonized, and the protective effect of the concrete on the steel bar will be weakened, even leading to corrosion of the steel bar.
Jing-shuang Zhang, Meng Cheng, Jian-hua Zhu   +2 more
doaj   +1 more source

Grain-size composition predicting models after explosion in open-pit mining

Journal of Degraded and Mining Lands Management, 2019
One of the main technological tasks facing mining engineers today is a reduction of the oversized fraction output. Currently, the efforts of scientists are aimed atdeveloping reliable grain-size composition predicting models for the extracting rock mass,
A K Kirsanov, S A Vokhmin, G S Kurchin, E V Zaitseva, E P Volkov   +4 more
doaj   +1 more source

Investigation on physico-mechanical properties and microstructural evolution patterns of heated granite after liquid nitrogen cooling

Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2023
Liquid nitrogen (LN2) fracturing is recognized as an innovative reservoir enhancement technique, demonstrating significant potential in establishing high permeability pathways in geothermal development. Understanding the physico-mechanical properties and
Zhouqian Wu, Minghui Li, Heping Xie, Jun Lu, Cancan Chen   +4 more
doaj   +1 more source

ANALYSIS OF SHAFT LINING STRESS STATE IN ANHYDRITE-ROCK SALT TRANSITION ZONE

Rudarsko-geološko-naftni Zbornik, 2022
The main question of this paper is the stress-strain state prediction of the vertical shaft’s combined lining located at the interface of two layers of dolomite and salt. The study predicts geomechanical processes at the contact of the dolomite layer and
Maxim A. Karasev, Anatoly G. Protosenya, Andrey M. Katerov, Vladislav V. Petrushin   +3 more
doaj   +1 more source

CONSTRUCTION OF UNDERGROUND STRUCTURES IN URBAN AREAS

Journal of Faculty of Civil Engineering, 2023
The aim of this paper is to emphasize the significance of underground structures in urban areas by exploring specific requirements and limitations related to their planning, construction, and utilization in comparison to structures outside urban areas.
Perčić Ivana, Jokanović Igor
openaire   +2 more sources

Early construction cost and time risk assessment and evaluation of large-scale underground cavern construction projects in Singapore

, 2020
The applicability of the Decision Aids for Tunneling (DAT) as an early construction cost and time predicting tool for large-scale underground cavern construction projects is investigated in this study.
Maruvanchery, Varun, Tiong, Robert Lee Kong, Shao, Zhe   +2 more
core   +1 more source