an underground opening between the time it is first excavated up to the time that a permanent lining is in place Typical temporary supports are shotcrete rock bolts andor steel ribs16 17 Permanent support defined as the support that is designed and installed to guarantee the long term stability of the underground structure
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This manual is free of charge Any parts of this instruction manual including the illustrations and technical drawings may be copied to meet local needs without permission from the author or publisher provided the parts are distributed free not for pro t and reference to the source is made The author would appreciate receiving
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