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液状化した火山灰質地盤における杭の水平地盤反力係数の評価
| Title: | 液状化した火山灰質地盤における杭の水平地盤反力係数の評価 |
| Other Titles: | EVALUATION OF COEFFICIENT OF HORIZONTAL SUBGRADE REACTION OF PILES IN LIQUEFIED VOLCANIC ASH GROUND |
| Authors: | 江川, 拓也1 Browse this author | | 磯部, 公一2 Browse this author →KAKEN DB | | 畠山, 乃3 Browse this author |
| Authors(alt): | Egawa, Takuya1 | | Isobe, Koichi2 | | Hatakeyama, Osamu3 |
| Keywords: | volcanic ash soil | | liquefaction | | pile foundation | | coefficient of horizontal subgrade reaction | | centrifuge model test |
| Issue Date: | 2020 |
| Publisher: | 土木学会 |
| Journal Title: | 土木学会論文集C（地圏工学） |
| Journal Title(alt): | Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) |
| Volume: | 76 |
| Issue: | 2 |
| Start Page: | 191 |
| End Page: | 203 |
| Publisher DOI: | 10.2208/jscejge.76.2_191 |
| Abstract: | 火山灰質地盤における杭基礎では，常時の周面抵抗特性や水平抵抗特性が砂質土地盤とは異なることが確認されており，地震時における地盤～杭基礎系の相互作用も砂質土とは異なることが考えられる．
本検討では，火山灰質地盤の液状化に伴う杭の水平地盤反力係数の低減について，地盤の液状化強度比を指標とした火山灰質地盤と砂地盤における杭の遠心力模型実験結果から定量的な評価を試みた．地盤の液状化に伴う杭の水平地盤反力係数の低減度を表す関係式を提案し，低減係数を評価した結果，地盤の液状化強度比との相関が確認されるとともに，火山灰質地盤では砂地盤よりも約2倍大きく評価された．このことから，火山灰質地盤の液状化に伴う杭の水平地盤反力係数の低減は，砂地盤の1/2程度と考察された． | | In this study, the decrease in the horizontal subgrade reaction coefficient of piles in liquefied volcanic ash ground was quantitatively evaluated by using a centrifugal model test with a liquefaction strength ratio of ground as a parameter. A relational equation which describes the decrease in the horizontal subgrade reaction coefficient of piles in liquefied ground was proposed and the related coefficients were evaluated. As a result, it was confirmed that the coefficient which presents the decrease level was correlated with the liquefaction strength ratio of ground, and the coefficient for volcanic ash ground was evaluated nearly twice as large as that for sandy ground. The above examination revealed that it would be generally sufficient to regard the decrease in the horizontal subgrade reaction coefficient of piles in liquefied volcanic ash ground as being about half that in sandy ground. |
| Rights: | © 2020 公益社団法人 土木学会 |
| Type: | article |
| URI: | http://hdl.handle.net/2115/79841 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 磯部 公一
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