Experimental production and estimation of a variable impact weight for simple penetration tests

• HONDA Naomasa

  Department of Forest Science, Faculty of Agriculture, Tottori University

• OKUMURA Takenobu

  Department of Forest Science, Faculty of Agriculture, Tottori University

• TADA Yasuyuki

  Research Center for Fluvial and Coastal Disaster, Disaster Prevention Research Institute, Kyoto University Now in Department of Soil and Water Conservation, Forestry and Forest Products Research Ins

Bibliographic Information

Other Title

• 簡易貫入試験機の分割型ランマーの試作とその性能評価
• カンイカンニュウシケンキ ノ ブンカツガタ ランマー ノ シサク ト ソノ セイノウ ヒョウカ

Abstract

The resistance value in simple penetration tests, i.e., the Nc-value, is useful for investigating sliding surfaces or the surface soil layer of a forest slope. However, the impact weight of 5-kgf, which is the conventional one used in the tests, is too great for accurately estimating the physical characteristics of soil within the surface soil layer when the soil layer is soft. This paper proposes a new type of impact weight for simple penetration tests that is variable from 1-kgf to 5-kgf in 1-kgf increments. Many simple penetration tests are conducted in order to estimate the effect of this weight on an actual forest slope. Experimental results provide a detailed description of the vertical distribution of the penetration resistance value within the surface soil layer. This is made possible by using lighter weights than the conventional one, especially the weights 2-kgf and 3-kgf ones. In addition, the penetration resistance value obtained with the 3-kgf weight is nearly equal to that with Hasegawa 's soil penetration test, but detail is improved further by using the 2-kgf and 1-kgf weights.

Journal

• Sabo Gakkaishi

  Sabo Gakkaishi 59 (2), 21-29, 2006

  Japan Society of Erosion Control Engineering

Keywords

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

Details

• CRID: 1390282679044594176
• NII Article ID: 130004102182
• NII Article ID: 10018179822
• NII Book ID: AN0012035X
• DOI: 10.11475/sabo1973.59.2_21
• NDL BIB ID: 8047988
• ISSN: 02868385
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8047988
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
• Abstract License Flag: Disallowed