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Volume 44 (2003 - 200･･･
- Issue 6 Pages 331-
- Issue 5 Pages 274-
- Issue 4 Pages 213-
- Issue 3 Pages 142-
- Issue 2 Pages 84-
- Issue 1 Pages 2-
Volume 44, Issue 4
Displaying 1-5 of 5 articles from this issue
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Masayuki SUZUKI, Hiroyoshi KASA, Mitsuaki HIGO2003 Volume 44 Issue 4 Pages 213-222
Published: October 10, 2003
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSRecently, urethane grouting methods have been employed frequently on many construction works, especially in mountain tunneling, such as urethane forepoling for ground improvement, or urethane grouting for water tight. However, as far as the authors aware, for evaluating the grouting process, relation between solidified shapes of urethane grout and actual ground conditions has not yet been investigated.
In this study, urethane grouting tests on cut slope of weathered granite and decomposed weathered granite embankment were carried out. After injection, treated blocks formed by urethane and soil or rock were excavated out and examined for evaluating the effects of grouting.
As a result, it was confirmed that cylindrical type or plain board type blocks might be formed by urethane injection in actual ground. The shapes of the blocks were controlled by permeability and strength of the fissured grounds.View full abstractDownload PDF (4570K) -
Experimental Results on the Applicability for a Cropped SlopeFumito ITO, Masuyuki UJIHIRA, Masayuki YASUIKE, Yohei KAWAMURA, HIGUCH ...2003 Volume 44 Issue 4 Pages 223-233
Published: October 10, 2003
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSResults of geo-engineering monitoring by Monma et al. at Amatori-hashi, West Area, Wakayama, Japan, have shown that the frequency of various scale rock falls tends to increase just before a big rock fall or a slope failure. This phenomenon has been also observed just before 2nd slope failure following the 1st failure in 1997 at No. 2 Shiraito Tunnel, Hokkaido, Japan. The authors propose the frequency monitoring of small rock falls as a useful way to predict large-scale rock falls or slope failures. In this study, practical applicability of rock fall detection system using steel wire cable sensor and satellite phone was carried out. From this field study the following points were made clear: 1) the proposed system is able to transmit the measured rock fall signals to a remote office. The rock fall frequency and the rock fall source could be evaluated, even when the steel wire cable sensor was stretched on the cropped slope having no net, which made easy the propagation of the rock fall impact. 2) It was confirmed that rock fall characteristics, such as the falling velocity, could be evaluated through analysis of the data registered by the field side personal computer. 3) As a result of composition study of measured waveforms, it was concluded that stretching interval of steel wire cable sensors could be increased up to 10m without deterioration of the system rock fall detection abilities.View full abstractDownload PDF (4109K) -
Toshifumi IGARASHI, Haruka MARUYAMA, Kuniomi ASAKURA, Shuichi HATTORI2003 Volume 44 Issue 4 Pages 234-242
Published: October 10, 2003
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSBatch leaching experiments using the mixed crushed-rock samples of pyrite-bearing rocks and calcite-bearing rocks were carried out to quantify the neutralization by calcite dissolution for acid leachate resulting from pyrite oxidation. The results showed that the leachate pH increased with the mixed ratio of the calcite-bearing rock, and that the pH was determined by the molar ratio of carbonate-carbon content to sulfide-sulfur content in the samples. The ratio for evaluating leachate pH was also applicable to the mixed samples. However, the pH dramatically decreased when the Ca and SO4 concentrations in the leachate approached the solubility of gypsum. This indicates that the formation of gypsum interrupts the neutralization by calcite dissolution.View full abstractDownload PDF (1437K) -
Yoshihiro KAMEO, Yokito SUGIMURA, Ichirou TAKEUCHI, Shinji TAKEDA2003 Volume 44 Issue 4 Pages 243-248
Published: October 10, 2003
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSIn order to consider an effective use of excavated surplus soils and riverbed deposits produced at the fields for concrete aggregates, core samplings were performed in the sedimentation part of the debris barrier built in 1958 by using the Hybrid Boring method (i. e. the air bubble boring method, hereafter denoted as tha HB method). The boring site is underlain by many kinds of sediments such as humus, clays, sands, gravels, and so on, which deposited in the past 40 years. The HB method was able to collect most of core samples form the boring length deeper than the groundwater level by performing stable supply of high concentration air bubbles and by the fine tuning of pressure which sends air bubble. Moreover, it was shown that effective laboratory soil tests were able to be performed using core samples collected from riverbed deposits, and the advisability of diverting riverbed deposits into materials of civil engineering became clear.
As for investigations of grasping the distribution of riverbed deposits, trench surveys and boring investigations have been carried out. In case that the thickness of riverbed deposits is more than 20m, it is difficult to investigate in a trench surveys. Moreover, by using the usual boring method, it is difficult to obtain high quality core samples because of the disorder of core samples. On the other hand, though a distribution of riverbed deposits is more than 20m, high quality core samples can be obtained by using the HB method. For considering effective use of riverbed deposits, it is clear that the HB method is effective investigation.View full abstractDownload PDF (3609K) -
[in Japanese]2003 Volume 44 Issue 4 Pages 249-256
Published: October 10, 2003
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSDownload PDF (6512K)
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