JP2016065376A - 地盤の液状化防止方法 - Google Patents
地盤の液状化防止方法 Download PDFInfo
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- JP2016065376A JP2016065376A JP2014193640A JP2014193640A JP2016065376A JP 2016065376 A JP2016065376 A JP 2016065376A JP 2014193640 A JP2014193640 A JP 2014193640A JP 2014193640 A JP2014193640 A JP 2014193640A JP 2016065376 A JP2016065376 A JP 2016065376A
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- 230000000694 effects Effects 0.000 abstract description 12
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- 229910000831 Steel Inorganic materials 0.000 description 2
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- 239000011178 precast concrete Substances 0.000 description 1
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Abstract
【解決手段】揚水量を制御しつつ揚水手段5により液状化層2の地下水を揚水し、所定の平常時水位WL1まで地下水位を下げた後、平常時水位WL1を維持しつつ、地震動検知手段7により地震動を検知した際には、揚水手段5の揚水量を増して地下水位を平常時水位WL1より地震時水位WL2まで低下させ、地震時水位WL2を一定期間維持した後、地下水位を地震時水位WL2より平常時水位wl1に復帰させる地盤の液状化防止方法。
【選択図】図3
Description
WL1 平常時水位
WL2 地震時水位
1 構造物
2 液状化層
3 粘土層
4 集水体
5 揚水手段
5a ポンプ
5b 揚水管
6 揚水制御手段
7 地震動検知手段
8 地下水位計測手段
9 遮水壁
Claims (4)
- 液状化層に集水体を設置し、該集水体に流入した水を揚水手段により揚水し、前記液状化層の地下水位を下げることにより地盤の液状化を防止する地盤の液状化防止方法において、
前記揚水手段の揚水量を制御する揚水制御手段と、地震動を検知する地震動検知手段とを使用し、
前記揚水手段により前記液状化層の地下水を揚水し、所定の平常時水位まで地下水位を下げた後、前記揚水手段の揚水量を制御して前記平常時水位を維持しつつ、前記地震動検知手段により地震動を検知した際には、前記揚水手段の揚水量を増して地下水位を予め低下している前記平常時水位より低い地震時水位まで低下させ、該地震時水位を一定期間維持した後、地下水位を前記地震時水位より前記平常時水位に復帰させることを特徴とする地盤の液状化防止方法。 - 前記液状化層の周囲に遮水壁を設置する請求項1に記載の地盤の液状化防止方法。
- 地下水位を逐次計測しつつ、前記揚水手段を構成するポンプの稼動と停止を適宜繰り返すことにより前記平常時水位を維持し、地震動を検地した際には、前記ポンプの稼動を一定期間継続して予め低下している前記平常時水位より更に低い前記地震時水位まで地下水位を低下させ、前記一定期間経過後は、地下水位が前記平常時水位に復帰するまで前記ポンプを停止させ、然る後、前記ポンプの稼動と停止を適宜繰り返すことにより前記平常時水位を維持する請求項1又は2に記載の地盤の液状化防止方法。
- 前記地震時水位を維持する期間を余震頻発期とする請求項1〜3の何れか一項に記載の地盤の液状化防止方法。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017226983A (ja) * | 2016-06-21 | 2017-12-28 | 前田建設工業株式会社 | 地下水位低下工法 |
CN108374406A (zh) * | 2018-02-07 | 2018-08-07 | 河海大学 | 自动感应地震纵波并主动排水的抗地基液化系统及使用方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4273475A (en) * | 1976-09-22 | 1981-06-16 | Raymond International Inc. | Load supporting structure |
JPH0438319A (ja) * | 1990-06-04 | 1992-02-07 | Fujita Corp | 地盤の液状化防止方法 |
JPH04203015A (ja) * | 1990-11-30 | 1992-07-23 | Shimizu Corp | 砂地盤の液状化防止工法 |
JP2003090032A (ja) * | 2001-09-17 | 2003-03-28 | Kajima Corp | 揚水式透水性杭を用いた液状化対策工法及びその装置 |
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- 2014-09-24 JP JP2014193640A patent/JP6365979B2/ja active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4273475A (en) * | 1976-09-22 | 1981-06-16 | Raymond International Inc. | Load supporting structure |
JPH0438319A (ja) * | 1990-06-04 | 1992-02-07 | Fujita Corp | 地盤の液状化防止方法 |
JPH04203015A (ja) * | 1990-11-30 | 1992-07-23 | Shimizu Corp | 砂地盤の液状化防止工法 |
JP2003090032A (ja) * | 2001-09-17 | 2003-03-28 | Kajima Corp | 揚水式透水性杭を用いた液状化対策工法及びその装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017226983A (ja) * | 2016-06-21 | 2017-12-28 | 前田建設工業株式会社 | 地下水位低下工法 |
CN108374406A (zh) * | 2018-02-07 | 2018-08-07 | 河海大学 | 自动感应地震纵波并主动排水的抗地基液化系统及使用方法 |
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