BACK FILLING MATERIAL, METHOD FOR FORMING PERMEABLE LAYER AND THE PERMEABLE LAYER

摘要

PROBLEM TO BE SOLVED: To provide a permeable back filling material capable of surely generating permeability after being filled into a tail void and being hardened during the construction of a shield tunnel, a method for forming a permeable layer at an outer periphery of the shield tunnel by using it and the permeable layer thereof.

SOLUTION: A back-filling material filled into a tail void during the construction of a shield tunnel has alkalinity while having fluidity at its filling into the tail void. After being filled into the tail void, the back filling material is mixed with an alkaline hardening material which is hardened with the lapse of time and gel which absorbs water in a water absorption polymer which is dehydrated and shrunk in an alkaline circumference.

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