Various Techniques for Fiber Reinforcement
Placing wire netting in thin shotcrete layers was found to be a difficult, dangerous and time-wasting method. Searching for other ways to reinforce the concrete, it has been found that...

Advances in Shotcrete Technology for Support of Underground Openings in Canada
This paper presents a broad overview of the state-of-the-art of shotcrete technology for support of underground openings in Canada. Advances in shotcrete technology such as the introduction...

Design of Shotcrete Linings at the Channel Tunnel
Shotcrete is one of the essential support elements of tunnels driven according to the principles of the New Austrian Tunnelling Method (NATM). Whereas originally the NATM was mainly based...

Construction of Shotcrete Linings Channel Tunnel
Without the use of shotcrete and the flexibility it offers in terms of tunnel profile, economy and speed of tunnelling, the project would certainly not be as far advanced as it is at present....

The Introduction of Steel Fibre Shotcrete to Underground Cavern Support in Taiwan
The Mingten project is located in a sheared, sandstone rock mass near a regional fault. The design philosophy introduced steel fibre shotcrete as a permanent cavern support in Taiwan....

Fibre Reinforced Shotcrete Case Studies of Wet and Dry Processes
Both wet shotcrete and fibre reinforced shotcrete are being increasingly utilised in the South African mining industry. This Paper describes two applications of fibre reinforced shotcrete...

Reinforced Shotcrete Linings as Part of an Integrated Support System Used in a High Stress Mining Environment
Shabanie and King Mines are situated in the Southern part of Zimbabwe, some 60 km apart and approximately 200 km east of Bulawayo. They are the largest underground operations in Zimbabwe...

Accelerator for Shotcrete Based Amorphous Calcium Aluminate
The authors developed an accelerator based on amorphous cacium aluminate named NATMIC for shotcrete. In Japan, accelerator based amorphous calcium aluminate are widely used in shotcrete...

Hydration Properties of Shotcrete with an Accelerator Based on Calcium Aluminate
A new powder-type accelerator based on calcium aluminate has been used for shotcrete in underground construction. This accelerator can be applied to all types of shotcreting. The shotcrete...

Steel Fiber Reinforced Shotcrete—An End-User Prospective
Nearly 15 years of experience demonstrates that steel reinforcing fibers in shotcrete offer considerable advantages to all end-users: designers, contractors and owners. These include demonstrable...

What Does Bring Ductility to Steel Fibre Reinforced Shotcrete?
It is generally accepted that ductility is the main characteristic of SFRS. Tests on scale 1/1 have been conducted to determine the influence of ductility on the bearing capacity and crack...

A Comparative Study of Different Steel Fibers in Shotcrete
Two steel fiber reinforced shotcrete (sfrs) test programs have been carried out in eastern Canada using steel fibers which are available in the north American marketplace. The first program...

Principles for a Rational Design of Shotcrete Linings in Hard Rock
The rock load on a shotcrete lining is hard to determine. This fact, however, does not prevent from designing the lining in a rational and consequent way. The paper treats the problem...

To the Limits of Shotcrete Linings
In the 1950s for the first time shotcrete was used because an essential support measure to guarantee the stability of an underground opening in Austria, Detzelhofer (1). Since that time...

Steel Fibre Reinforced Shotcrete Design
There is a need for introducing toughness and ductility in SFRS design. The Japanese Standard introduces the equivalent flexural strength, which characterizes SFRS toughness and allows...

Influence of Early-Age Properties of Shotcrete on Tunnel Construction Sequences
This paper presents a study on influence of the properties of young shotcrete as a tunnel lining on tunnel construction sequences, by a closed-form analytical solution of a circular tunnel....

Use of Shotcrete on Recent Tunnel Projects in the South and East, USA
Shotcrete and rockbolts are now the primary method of ground support for the majority of rock tunnels in America. This paper describes the use of shotcrete and some of the shotcreting...

Adapted Actions Taken at Too Low Shotcrete Quality
A tunnel contract specified quality parameters such as: thickness, compressive strength, adhesive strength, bending tensile strength and residual bending tensile strength for fibre reinforced...

Application of Shotcrete for Ground Support at Inco Mines
In 1989, shotcrete was first successfully introduced for ground support in production areas at Frood Mine. Until then the only successful application of shotcrete had been in major permanent...

Guidelines and Recommendations on Shotcrete—An International Compilation
Part of the work within the International Tunnelling Association's (ITA) working group Shotcrete Use has been to compile existing guidelines and recommendations concerning shotcrete, particularly...

 

 

 

 

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