简介:Animportantscientificexpeditionin1958tookhundredsofscientiststoAntarctica,whichisalargecontinentatthesouthemtipoftheearth,andsurroundstheSouthPole,andmostofwhichiscoveredbysnowandice.Thegreaticesheetgoesonandon.AtsomeplaceinAntarcticatheiceismorethaathreemilesthick.ThePacific,AtlanticandIndianOceansringthecontinent.
简介:摘 要:盾构施工是目前地铁隧道施工最常用的施工工法,地面危险源是盾构施工的重难点,利用微动探测对不具备现场施工条件的危险源进行探测和保护。