So as to hold again water seepage from tunnel partitions, the front of the tunnel or shield is generally pressurized with compressed air. Immersed-tube building can delve deeper than other approaches because the method doesn't require compressed air to hold water at bay. They sound terrifying, but underwater tunnels are so commonplace that we rarely consider the good dangers -- and xây nhà trọn gói Phước Long excessive development strategies -- these fashionable wonders require. Lane, Kenneth S. "Tunnels and Underground Excavations.
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