JP2008111289 GEOLOGICAL EVALUATION METHOD OF NATURAL GROUND.

PROBLEM TO BE SOLVED: To provide a geological evaluation method of natural ground, capable of highly accurately predicting a geological state in front of a cutting face.; SOLUTION: In an existing excavation part 5 of the natural ground 1, a hole drilling speed 11 and impact pressure 13 when drilling a hole in front of the cutting face 9a and a cutting face evaluation point 15 of the cutting face 9a, are acquired in response to a distance degree. Next, the hole drilling speed 11 and the impact pressure 13 are analyzed by a multivariate analysis, and a natural ground evaluation point A is calculated by making a geology predicting expression (an expression 1). A natural evaluation point B is calculated by making a geology predicting expression (an expression 2) by adjusting a variation width of the natural ground evaluation point A and the cutting face evaluation point 15. In an unexcavated part 7 of the natural ground 1, a hole drilling speed 17 and impact pressure 19 are further acquired by drilling a hole in front of a cutting face 9 in response to a distance degree. Afterwards, the natural ground evaluation point B in the unexcavated part 7 of the natural ground 1 is predicted by using the geology predicting expression (the expression 1), the geology predicting expression (the expression 2), the hole drilling speed 17 and the impact pressure 19.; COPYRIGHT: (C)2008,JPO&INPIT

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