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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.show more
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§１． 緒論 §２． ひずみゲージを使用した貫入ロッドの応力披測定 ２.１ 測定装置 ２.２ 測定器の特性 §３． 簡易貫入試験機Ⅰ号機の試作と応力波測定 ３.１ Ⅰ号機の構造 ３.２ 応力波測定結果と考察 §４． 簡易貫入試験械Ⅱ号機の開発と応力波測定 ４.１ Ⅱ号機の構造 ４.２ 応力波測定結果と考察 §５． 結論 文献
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