Web1 okt. 1994 · McCracken and Stacey (1989) rec- ognized that Barton's original approach was not well-suited to a vertical ma- chine-bored excavation where there is no opportunity to install support ira- Volume 9, Number 4, 1994 TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 427 10 E E C~ 0.1 IExce0,,ona,,yPoorlEx,reme,yPoorl VeryPoor … Web1 jan. 2011 · McCracken and Stacey (1989) had previously recommended that additional geotechnical data should be acquired and analysed when the proposed raise plotted on …
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Web1989. A significant increase in the diameter of raise-bored shafts has been seen recently with advances in techniques and equipment. The increase in diameter leads to a greater … Web10 okt. 2014 · McCracken and Stacey published the method in 1989 and it was successfully applied to the planned Airshaft No.5 at Broken Hill that same year. The method predicted … nike brown football boots
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Web20 aug. 2014 · Hencher and Richards (1989) Assessing the Shear Strength 893. 123. ... (Hoek 2014; Read and Stacey 2009) based on Barton (1982) so has some authority as a … WebIntroduction During the preliminary design phases and feasibility study of a proposed vertical shaft, very little detailed information is available on the rock mass characteristics, in-situ stress, rock strengths, and hydrological characteristics for the evaluation of the project. A pre-sink diamond drill-hole is normally drilled on the proposed site and is steered with the … WebMcCracken, A & Stacey TR 1989, ‘Geotechnical risk assessment for large-diameter raise-bored shafts’, Proceedings of the Second International Conference on Shaft Design and … nike bruin red and white