| 摘要 |
PROBLEM TO BE SOLVED: To realize a method in which a water sealing state can be controlled simply both when a tunnel is constructed and when the tunnel is used. SOLUTION: In a control method for a water sealing state, when a water sealing tunnel 12 is constructed in advance, a plurality of electrodes 20 for sensitivity measurement are installed at prescribed intervals on a measuring line 18 which is assumed along the tunnel axial line of the water sealing tunnel 12 as its excavating operation advances. The measuring line 18 is set in a straight-line shape. A pair of measuring lines can be set on the left side and the right side of the water sealing tunnel 1 or one measuring line can be set on the bottom face of the water sealing tunnel 12. When the electrodes 20 are installed, the electrodes 20 are electrified, and the sensitivityρof a bedrock is measured. The sensitivityρof the bedrock has a value which dependes on the degree of saturation of moisture in the bedrock. When the sensitivityρof the bedrock is found, the degree of saturation of the moisture in the bedrock can be estimated on the basis of its value. When the excavating operation is performed while the degree of saturation of the moisture in the bedrock is being estimated, it is possible to prevent the bedrock from becoming an unsaturated state when the water sealing tunnel 12 is constructed.
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