採掘変形計測による広域応力と地盤ヤング率の評価

概要

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A method to evaluate the regional stresses and the Youngs modulus by analyzing mining induced deformation of the ground is proposed.Mining induced deformation is interpreted as the deformation due to the geometrical change of the ground surface caused by mine activity and it is classified in two types, i.e., the displacement increment induced by gravity and that by the horizontal regional strain. It is pointed out that both the regional strain and Youngs modulus can be estimated by analyzing the mining induced deformation, because the displacement induced by the regional strain is independent of the Youngs modulus and the displacement induced by the gravity is inversely proportional to the Youngs modulus. The relative displacement due to mine excavation in Torigatayama mine were measured by GPS (Global Positioning System) and the regional stress state and Youngs modulus were estimated by a back-analysis using three dimensional finite element method. It is shown that the maximum principal direction of regional stresses is almost NE-SW and Youngs modulus of the ground is 3 to 6GPa in the present field.
社団法人資源・素材学会の論文
2008-09-25