MUDDY EARTH PRESSURE SHIELD TUNNELING METHOD, EARTH PRESSURE SEMI SHIELD TUNNELING METHOD AND MUD-A

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PROBLEM TO BE SOLVED : To provide a muddy earth pressure shield tunneling method and an earth pressure semi shield tunneling method imparting excellent plastic fluidity, water-stopping property to the excavated soil and sand and sufficiently suppressing syneresis, improving excavating efficiency, and to provide a mud-adding material suitably used in civil engineering work such as the tunneling methods. SOLUTION : The invention relates to the muddy earth pressure shield tunneling method using the mud-adding agent, wherein the mud-adding material comprising (A) a (meth)acrylic acid-based water-soluble polymer having 500, 000-6, 000, 000 of weight average molecular weight and (B) a dispersing agent with ≤100, 000 of weight average molecular weight. COPYRIGHT : (C)2006, JPO&NCIPI