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IMPORTANT- READ THESE TERMS CAREFULLY BEFORE ENTERING THIS ASTM PRODUCT.īy purchasing a subscription and clicking through this agreement, you are entering intoĪ contract, and acknowledge that you have read this License Agreement, that you understand These results demonstrate the usefulness of the technique in modeling progressive collapse of a tunnel and show ample promise of its use in the modeling of the construction of a tunnel using the NATM (New Austrian Tunneling Method). Results from the first few trials of this technique in a 2 m diameter drum centrifuge are presented. Since there is no air or fluid pressure involved, there is also no need to seal the ends of the tunnel segment. The stiffness of the lining is correctly left in place when the foam core has been dissolved. The stiffness of the filled tunnel can, approximately, be made to simulate the parent soil. This technique is an improvement over other contemporary methods of modeling tunnel construction, such as reduction of air pressure supporting the tunnel lining or gradually draining zinc chloride solution (or some other heavy liquid) from within the lining. It involves the use of a polystyrene foam core that is placed tightly inside the tunnel lining and that can be dissolved using an organic solvent. A new technique is presented for the simulation in a centrifuge of the excavation and lining of a model tunnel.
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