Results 31 to 40 of about 16,972 (255)

Implementation of probabilistic approach to rock mass strength estimation while excavating through fault zones [PDF]

, 2019
Purpose. The paper addresses the rock mass state estimation while excavating a cross-heading through the area of regional fault “Bohdanivskyi” based on probabilistic approach to assessing the rock strength. Methods.
Babets, D, Cabana, E.C., Kravchenko, K, Sdvyzhkova, O, Shashenko, O   +4 more
core   +1 more source

Safety Distance of Shotcrete Subjected to Blasting Vibration in Large-Span High-Speed Railway Tunnels

Shock and Vibration, 2019
The drill and blast method is widely used in constructing tunnels in rock. Unfortunately, blasting vibration can damage newly performed shotcrete layers which are major support structures to stabilize surrounding structures.
Ao Li, Dingli Zhang, Qian Fang, Jiwei Luo, Liqiang Cao, Zhenyu Sun   +5 more
doaj   +1 more source

Filler Effect in Shotcrete [PDF]

Materials, 2019
The effects of fine limestone powder on the early hydration of cementitious systems accelerated by means of alkali-free aluminum sulfate based products, commonly used for shotcrete applications, were investigated in the course of laboratory and real scale tests.
Galan, Isabel, Briendl, Lukas, Thumann, Maria, Steindl, Florian, Röck, Rudolf, Kusterle, Wolfgang, Mittermayr, Florian   +6 more
openaire   +2 more sources

Arguments for a "U.S. Kamioka": SNOLab and its Implications for North American Underground Science Planning [PDF]

, 2006
We argue for a cost-effective, long-term North American underground science strategy based on partnership with Canada and initial construction of a modest U.S. Stage I laboratory designed to complement SNOLab.
Aalseth, Akerib, Arnaboldi, Bemmerer, Bonvicini, Carson, Chen, Danilov, Erikson, Gaisser, Gaisser, Galbiati, Huber, J.F. Wilkerson, K.A. Philpott, Lanou, Laubenstein, McKinsey, Nakamura, Philip Long, Robert Holtz, Smith, W.C. Haxton   +22 more
core   +1 more source

INVESTIGATING THE FEASIBILITY OF USING RECYCLED FIBRES INSTEAD OF INDUSTRIAL FIBRES IN SHOTCRETE

Rudarsko-geološko-naftni Zbornik
Shotcrete is one of the standard systems used in the tunnelling industry, including cement, sand, water, and additives. Adding fibres to shotcrete is a method to enhance its mechanical properties.
Shahla Miri Darmarani, Erfan Khoshzaher, Hamid Chakeri, Rahman Mirzaei   +3 more
doaj   +1 more source

Analysis of Support Reaction Curves considering Time-Varying Effect of Shotcrete

Advances in Civil Engineering, 2020
The core content of the convergence constraint method is to determine the reasonable support time and support stiffness. The stiffness of shotcrete in supporting structure is dynamic.
Ya-Qiong Wang, Ming-Rui Luo
doaj   +1 more source

Analysis of Rebound Rate of Wet Shotcrete Based on Experiment and Discrete Element Method

Shock and Vibration, 2022
Wet shotcrete support is the main support method for underground engineering construction at present. The rebound rate is one of the indicators to evaluate the support effect, and a lower rebound rate will improve the construction effect of wet shotcrete.
Chang Su, Zhuang Wu, Xiaokui Zheng
doaj   +1 more source

On the design of the fiber reinforced shotcrete applied as primary rock support in the Cuiabá underground mining excavations: A case study

Case Studies in Construction Materials, 2021
The Cuiabá mine is an underground gold operation located in Sabará (Minas Gerais, Brazil), which began to use fiber reinforced shotcrete as rock support since 2012.
Vitor Moreira de Alencar Monteiro, Flávio de Andrade Silva   +1 more
doaj   +1 more source

Implementation of a new time-dependent shotcrete constitutive model for 3D tunnel modeling

Results in Engineering
Shotcrete behaviors, including modulus and compressive strength, are highly time-dependent. Moreover, freshly applied shotcrete is subjected to loading immediately after application, making its realistic representation both essential and challenging in ...
Sinodos S. Sefene, Dirk Zapf, Martin Achmus   +2 more
doaj   +1 more source

Numerical Simulations of Restrained Shrinkage Cracking in Glass Fibre Reinforced Shotcrete Slabs

Advances in Civil Engineering, 2017
Modern tunnels in hard rock are usually constructed by drill and blast with the rock reinforced by shotcrete (sprayed concrete) in combination with rock bolts.
Andreas Sjölander, Anders Ansell
doaj   +1 more source