山地用貫入試験器の開発 : 小径鋼製丸棒の応力波伝ぱ特性の解析による

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タイトル別名
  • Development of Penetration Test Apparatus for Mountain Slope : An Analysis of Characteristics in Slender and Cylindrical Steel Rod due to Propagating Stress Waves
  • 山地用貫入試験機の開発--小径鋼製丸棒の応力波伝ぱ特性の解析による
  • サンチヨウ カンニュウ シケンキ ノ カイハツ ショウケイ コウセイ マルボウ

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抄録

A simplified penetrating apparatus was developed for exploring soil profiles in slope. Examination of penetration of steel rod was carried out by measur・ ing the amplitude and time・ interval of stress waves propagating through a cylindrical rod. The results are summarized as follows: I) Using apparatus consisting of strain gauges and high speed amplifier (D.C.250 kHz) , a successful measurement was made of stress waves through the rod caused by the impact of a drop hammer. 2) From measurement of stress waves propagating through the rod of the simplified penetrating apparatus No. I (diameter of rod: 10 mm, Figure-4, Table-3), using the framed apparatus, the magnitude of initial stress was observed. The coefficient of variation for measured values was 0.080 (Table-5). The amplitude of stress tended to fluctuate. A major cause of this fluctuation was that the rod was slender and its traverse vibrations were generated by the impact of the hammer. 3) The simplified penetrating apparatus No. II (diameter of. rod: 14 mm, Figure- 7, Tab1e-4) was contrived by eliminating the imperfections of penetrating apparatus No. I. This apparatus has an equipment for preventing the rod from undergoing traverse vibrations. The coefficient of variation was 0.012 (Table-5). The error due to teaverse vibrations was thus excluded. 4) The behavior of stress waves through the rod can be explained theoretically by the graphodynamical method. 5) The n-value has been only one information obtained from ground using a simplified penetrating apparatus. But, using the apparatus for observing stress waves, another information can be obtained by investigating the reflection coefficient in detail between the lower end of rod and soil.

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