On the Mechanism of Caving-in due to Mining at a Shallow Depth (3rd Report)

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  • 浅所陥没の発生機構に関する研究 (第3報)
  • 浅所陥没の発生機構に関する研究-3-有限要素法による弾塑性解析
  • センショ カンボツ ノ ハッセイ キコウ ニカンスルケンキュウ 3 ユウゲン
  • 有限要素法による弾塑性解析
  • Plasticoelastic analysis by finite element method

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Abstract

To study the mechanism of caving-in we have carried out experimental and theoretical analysis in the 1st and 2nd reports. On those analyses, the earth layer was idealized into homogeneous, isotropic and continuous material.<BR>In this paper we defined that the earth layer was a perfectly plasticoelastic material and the mechanism of caving-in was studied theoretically by finite element method.<BR>The results obtained are as follows.<BR>1) Finite element method is a powerful method in order to study the mechanism of caving-in.<BR>2) Caving-in has a tendency to occur with small cohesion, small angle of internal friction and large specific weight, large width of mining cavity.<BR>3) When caving-in occurs, there is the limiting value for the relationship between width of mining cavity and the strength of earth layer.

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