METHOD FOR REMOVING GAS FROM GROUND AND TUNNEL-BORING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for removing gas from the ground and a tunnel-boring method capable of narrowing a range of influence in the ground.;SOLUTION: A method for removing gas from the ground, comprises: a water flow pipe installation process to arrange a water flow pipe 4 having a strainer section 4a on at least a lower end side thereof so that the lower end side thereof is positioned in a water-bearing layer G1 and to allow underground water to flow into the water flow pipe 4 through the strainer section 4a; and a water level lowering process to lower a water level in the water flow pipe 4 by pumping water therein so that a hydraulic head h of the water in the water flow pipe 4 is lower than a reference hydraulic head ha, defined by the hydraulic head h balanced with the hydraulic head of the underground water in the water-bearing layer G1, by a predetermined hydraulic head difference Δh₀. The method removes the gas in the water-bearing layer by introducing the same into the water flow pipe. In a tunnel-boring method, the ground is excavated after removing the gas from the water-bearing layer G1 in the ground using the method for removing the gas.;COPYRIGHT: (C)2016,JPO&INPIT