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Keywords: eastern tube
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Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2005, May 18–20, 2005
Paper Number: ISRM-EUROCK-2005-018
.... <b 2S rrrn. LA - 4 resa 6 m.I 1 iY1dYlri'1!l system i1 a raster 2.0 x 15 m.1 rs!aWndT r J" / sOOtcret d _ 20 an . . / 1 layer rJ reWorci1g ~outwcrd /0'" '" _, ird1 t~at. with --J'I'1~ Figure 8. Excavation and support in Bunter and base sediments. out (Fig. 8). In order to support the tunnel face and the working area against the dropping of so-called "coffin lids" where the bedding is approximately horizontal, preceding spiles were installed. In areas with the bed- ding dipping moderately steeply towards the tunnel, a core was left standing to support the tunnel face. Maximum performances of appro 4 to 5 m per day and tunnel face were achieved with this heading technique. 4 HEADfNG SCHEDULE Figure 9 shows exemplarily the heading progress over time for the eastern tube. At the northern portal the heading works started on March 18, 2000, and at the southern portal on April 10, 2000. The 2700 m long eastern tube was successfully cut through on January 19,200 I. With a heading time of 10 months, this cor- responds to an average heading performance of appr. 9 mid. In the granite and the porphyrite, partially a maximum performance of> 10m per day and tunnel face was achieved, as explained above. In parallel with the eastern tube, the western rube was excavated in a so-called alternating heading. The construction time intervals and heading performances roughly correspond to those of the eastern tube. The cut-through of the western...

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