分割型ランマーを用いた簡易貫入試験機の分解能の向上

• 本田 尚正

  砂防学会 鳥取大学農学部 現 茨城大学理学部

• 奥村 武信

  砂防学会 鳥取大学農学部

• 多田 泰之

  砂防学会 独立行政法人森林総合研究所

書誌事項

タイトル別名

• Improvement of resistance value in simple penetration tests using a variable impact weight
• ブンカツガタ ランマー オ モチイタ カンイ カンニュウ シケンキ ノ ブンカイノウ ノ コウジョウ

抄録

This paper proposes a new type of impact weight for simple penetration tests that is variable from 1- to 5-kgf in 1-kgf increments. Many simple penetration tests were conducted to estimate the effect of this weight in three actual forests. Experimental results provide a detailed description of the vertical distribution of penetration resistance values within the surface soil layer by using 2- and 3-kgf weights, which are lighter than conventional ones, i.e., 5-kgf. The ratio of penetration resistance values by using impact weights 5-kgf, 3-kgf, and 2-kgf, i.e., N_5kgf : N_3kgf : N_2kgf, is nearly equal to 1.00:2.02:3.66. In addition, N_3kgf nearly equals the resistance value obtained with Hasegawa's soil penetration test. These results show that variable impact weight is very useful for accurately estimating the physical characteristics of soil within forest slope where hillside collapse is liable to occur.

収録刊行物

• 砂防学会誌

  砂防学会誌 60 (5), 47-53, 2008

  Japan Society of Erosion Control Engineering

キーワード

• Simple penetration test
• variable impact weight
• improvement of penetration resistance value

詳細情報

• CRID: 1390282679043990528
• NII論文ID: 10021228144
• NII書誌ID: AN0012035X
• DOI: 10.11475/sabo1973.60.5_47
• NDL書誌ID: 9360356
• ISSN: 02868385
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9360356
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可