| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for evaluating stability of an excavated surface against sump water, which makes the stability of the excavated surface against the sump water rapidly and accurately evaluated in an excavation step. SOLUTION: This method for evaluating the stability the excavated surface against the sump water includes: a measurement step of measuring bearing strength by a soil hardness meter on a cutting face (excavated surface); an estimation step of estimating a critical hydraulic gradient of natural ground of the cutting face by using the bearing strength measured by the soil hardness meter in the measurement step, and a uniformity coefficient of the natural ground, obtained by a soil survey before excavation; and an evaluation step of evaluating the stability of the cutting face against the sump water by comparing the critical hydraulic gradient, estimated in the estimation step, with a hydraulic gradient of surrounding ground of the cutting face. COPYRIGHT: (C)2011,JPO&INPIT
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