An investigation was made into the relative costs of excavation retention by two systems: conventional soldier pile-wale-tieback support, and support by soil nailing. The investigation included design of excavation supports by the two...
"It was covered with a vault in about 100 BC." (caption, p.132); “[…] its length is over 900 metres [meters] (985 yards), but its course meanders because of diversions around buildings. Its size is remarkable: in places it is 4.2...