. Scientific American Volume 86 Number 14 (April 1902) . idification, bonding it in one solidmonolith. In applying the principle in the presentcase, strong bulkheads of timber were builtacross the tunnel at either end of the slide, anda mass of broken rock and stone was dumpedinto the crater above; about a dozen pipes werethen carried into the interior of the mass, sixof them from the surface above and threefrom the bulkheads at either end, and thegrouting driven through them into the materialby means of force pumps. No effort is beingmade to solidify the whole mass of debris inthe tunnel, but
. Scientific American Volume 86 Number 14 (April 1902) . idification, bonding it in one solidmonolith. In applying the principle in the presentcase, strong bulkheads of timber were builtacross the tunnel at either end of the slide, anda mass of broken rock and stone was dumpedinto the crater above; about a dozen pipes werethen carried into the interior of the mass, sixof them from the surface above and threefrom the bulkheads at either end, and thegrouting driven through them into the materialby means of force pumps. No effort is beingmade to solidify the whole mass of debris inthe tunnel, but merely that which lies aroundthe roof in the neighborhood of the , only the material in the lower halfof the crater will be thus grouted. When themass has set, it will be perfectly safe to exca-vate the tunnel to its full width. The newfoundations for the front of the houses thathave been injured will be then carried rightdown to the underlying rock, and, as thus restored,they will be perfectly safe against any further settle-ment. 3WST. Tunnel.
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