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Keywords: tunnel axis
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Proceedings Papers
Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-566
... geomechanics drilling rate drilling velocity tunnel axis stress condition ABSTRACT: In the Nathpa-Jhakri Hydroelectric Project - under construction since 1993 - unusual stress conditions show a severe influence on the drilling and blasting conditions. It is believed, that the in-situ stress field...
Proceedings Papers
Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-581
... the stability of the tunnels. CURRENT PRACTICE Broms and Bennermark (1967) introduced the concept of stability ratio, N, which can be defined as; N z s = + s T u 0 (1) where is unit weight of the soil, su is undrained shear strength of the soil at tunnel axis level, s is surface surcharge pressure, T...
Proceedings Papers
Paper presented at the ISRM International Symposium, September 21–24, 1981
Paper Number: ISRM-IS-1981-168
... ZONTAL I Nell NOilETER introduce thermal stress in the ground if any. l3days were required for thawing !Stage. Measurement of ground settlement 3 systems of measuring settlement were installed around the test tunnel. 1) Horizontal inclinometer 3 inclined holes along tunnel axis above the crown were...