System and shielding performance improvement method of bedrock within the cavity

摘要

PROBLEM TO BE SOLVED: To provide a method and system for improving shielding performance of a cavity in a base rock capable of improving/repairing surely a highly water-permeative spot, a loosening area or the like.;SOLUTION: A boring hole 12 is bored into the peripheral base rock 1 from a cavity 10 organized in the base rock 1, and oxygen or carbon dioxide is injected into an injection section A partitioned by a packer pair 13, 13 in the boring hole 12 to proliferate microbe in the base rock 1, and an injection pressure is measured continuously, and injection of oxygen or carbon dioxide is continued until a measured value of the injection pressure is increased to a prescribed injection pressure. Preferably, the packer pair 13, 13 can be moved in the depth direction of the boring hole 12, and while moving the injection section A, injection of oxygen or carbon dioxide is repeated until the measured value of the injection pressure is increased to the prescribed injection pressure at each injection section A. More preferably, water including oxygen or carbon dioxide is injected into the peripheral base rock 1, and injection of the including water is continued until the measured value of the injection pressure is increased to a prescribed injection pressure corresponding to a required water permeability of the peripheral base rock 1.;COPYRIGHT: (C)2008,JPO&INPIT