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The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

Showing 1-5 of 44 Abstracts search results

Document: 

SP54-26

Date: 

January 1, 1977

Author(s):

J. Golser

Publication:

Symposium Papers

Volume:

54

Abstract:

In many parts of the world I made unfortunately the experience that the prinicples of the "New Austrian Tunnelling Method" - the NATM - have mostly been misunderstood which leads to maldesigning or more seriously to constructional failures. The name for the method has been choosen by Prof. L.v. Rabcewicz the main inventor of the NATM in contradistinction to the "Old Austrian Method". To explain the principles of the method it seems to me the best way to follow first the historical development and to describe within this framework the main features of the NATM

DOI:

10.14359/18039

Document: 

SP54-27

Date: 

January 1, 1977

Author(s):

James E. Monsees

Publication:

Symposium Papers

Volume:

54

Abstract:

This paper describes the structural analyses of Bethesda and Medical Center Stations, Section Allb of the Rockville Route of the Washington Metropolitan Area Rapid Transit System. The station excavations will each be roughly semi-elliptical, approximately 56 feet wide by 40 feet high and about 700 feet long. Depth from ground surface to top of rail is approximately 135 feet; rock cover is approximately 80 to 95 feet.

DOI:

10.14359/18040

Document: 

SP54-28

Date: 

January 1, 1977

Author(s):

Franz Laabmayr

Publication:

Symposium Papers

Volume:

54

Abstract:

In this lecture, I would like to inform you generally as to extension of Section 9 of the Munich Metro located at Sendlinger Tor Platz in downtown Munich. The basic requirements on the application of the method of construction we selected for Section 9, also apply to the following Section 18.2 connecting up the mainline station. In September 1973 we were contracted by the joint venture for Section 9 to work out alternative proposals for advancing the various tunnel tubes in accordance with the New Austrian Tunnelling Method. Full scale advancement was started in spring of 1974 and is still going on.

DOI:

10.14359/18041

Document: 

SP54-29

Date: 

January 1, 1977

Author(s):

R. Cordel

Publication:

Symposium Papers

Volume:

54

Abstract:

Since EDF was founded in 1946, it has achieved a great number of hydroelectric plants, leading it to dig several million cubic meters of underground excavations for the intakes, the power stations and auxiliaries, plus hundreds of kilometers of head race tunnels. Rather often, these underground structures, standing in poor ground, had to receive a support. Let us note that since 1950 there have been a few applications of gunite. In fact, it was not exactly a support but rather a rock protection against weathering due to air and water.

DOI:

10.14359/18042

Document: 

SP54-30

Date: 

January 1, 1977

Author(s):

Gaberial Fernandez-Delgado

Publication:

Symposium Papers

Volume:

54

Abstract:

This report presents the results of model tests on thin shotcrete layers similar to those potentially used as initial tunnel support. The structural behavior and maximum carrying capacity of these layers were determined in this testing program. The large-scale test facility used was versatile enough to accommodate different geometrical configuration. Four principal modes of failure were observed: diagonal tension in the shotcrete, separation of the layer from the wall, thrust-moment interaction in the separated portion of the layer and bending failure of shotcrete layers loaded by sharp-edged blocks.

DOI:

10.14359/18043

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