Effects of pressure grout injection for the anchor body friction stress

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  • アンカー体摩擦応力に対するグラウト加圧注入の効果
  • アンカータイ マサツ オウリョク ニ タイスル グラウト カアツ チュウニュウ ノ コウカ

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Abstract

About the effects that pressure grout injection performed by ground anchor give to the function of the anchor and the increase mechanism of the anchor body surface friction stress with it, there are many points that are not yet clear. This is because it is hard to perform constant evaluation for the effects of the pressure grout injection to be affected by the inhomogeneous nature greatly on the natural ground. Therefore, in this study, I made two types of specimens which cast grout by presence of the pressurization for the homogeneous model ground which removed inhomogeneity and measured the friction stress between ground materials and grout by direct shear test. As a result, a good relationship was recognized between increase of the friction stress by the pressure grout injection and the dehydration phenomenon of the grout, and recognized the strength increase of the dehydrated grout. From these results, the increase mechanism of the anchor body surface friction stress in the homogeneous ground by the pressure grout injection estimated it to be a thing by the increase of the cohesive power by the strength increase with the dehydration of the grout.

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