JP4982631B2 - 地中壁造成による防波堤下の液状化対策工法 - Google Patents
地中壁造成による防波堤下の液状化対策工法 Download PDFInfo
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- JP4982631B2 JP4982631B2 JP2006190048A JP2006190048A JP4982631B2 JP 4982631 B2 JP4982631 B2 JP 4982631B2 JP 2006190048 A JP2006190048 A JP 2006190048A JP 2006190048 A JP2006190048 A JP 2006190048A JP 4982631 B2 JP4982631 B2 JP 4982631B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/11—Hard structures, e.g. dams, dykes or breakwaters
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Description
前記堤体の前後両縁部に沿ってそのやや外側下の前記砂質土層内に、一対の不透水性又は難透水性の地中壁を造成し、該地中壁によるせん断変形抑止効果によって地中壁間の砂質土層の体積変化を抑制させるようにしたことにある。
次に、有限要素法による地震応答解析による、本発明による液状化対策工法の効果の確認について述べる。この解析では、解析のための構造物のモデル化を行い、そのモデル化の材料定数を設定し、更に入力地震動(最大振幅、波形)を選定して地震応答計算を行った。解析結果として水平、鉛直方向の最大及び残留変位量等が算出される。
a.数値解析概要
数値解析の概要図: 図11
対象構造物: 防波堤(幅B=15.0m程度)
防波堤下の砂質土層厚:H=20m程度
入力地震動:1968年十勝沖地震の際に八戸港で得られた記録より算定した八戸基盤入射波形。
最大加速度:400gal
地中壁幅:L=4.5m、L=1.5mの2種類
b.検討ケース
表1に示す通りの3ケースとした。
10 砂質土層
11 捨石マウンド
12 堤体
13 被覆石
14 根固石
20 地盤改良機
20a 柱状体
21 オーガ
22 回転軸
23 攪拌翼
24 回転駆動機
25 深層混合処理船
26 リーダー
30 敷砂
31 グラブ付き自航運搬船
32 グラブ船
40 地盤改良機挿入部
41 回転筒
42 石材切削刃
43 コアカッター
50 軟質原地盤
Claims (5)
- 海底の砂質土層上に捨石マウンドを造成し、該捨石マウンド上にコンクリート製の堤体を設置して構成された防波堤下の液状化対策工法であって、
前記堤体の前後両縁部に沿ってそのやや外側下の前記砂質土層内に、該土層下の支持地盤に達しない深さの一対の不透水性又は難透水性の地中壁を造成し、該地中壁によるせん断変形抑止効果によって地中壁間の砂質土層の体積変化を抑制させるようにしたことを特徴としてなる地中壁造成による防波堤下の液状化対策工法。 - 前記防波堤が新設の防波堤であり、前記捨石マウンド造成前に防波堤下となる前記砂質土層内に前記地中壁を構築する請求項1に記載の地中壁造成による防波堤下の液状化対策工法。
- 前記防波堤が、既設の防波堤であり、該既設の防波堤下の砂質土層内に前記地中壁を構築する請求項1に記載の地中壁造成による防波堤下の液状化対策工法。
- 上記一対の不透水性又は難透水性の地中壁は、前記砂質土層内にセメント系固化材を混入させることにより造成する請求項1,2又は3に記載の地中壁造成による防波堤下の液状化対策工法。
- 上記一対の不透水性又は難透水性の地中壁は、前記砂質土層内に矢板を打設することによって造成する請求項1,2又は3に記載の地中壁造成による防波堤下の液状化対策工法。
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JP4982631B2 true JP4982631B2 (ja) | 2012-07-25 |
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Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2013053443A (ja) * | 2011-09-02 | 2013-03-21 | Penta Ocean Construction Co Ltd | 転倒防止補強付ケーソン防波堤 |
JP5787172B2 (ja) * | 2012-02-17 | 2015-09-30 | 清水建設株式会社 | 防波堤の嵩上げ工法 |
CN108930249A (zh) * | 2018-07-24 | 2018-12-04 | 交通运输部天津水运工程科学研究所 | 一种基于胶结化堆石的透水防波堤 |
JP7469608B2 (ja) * | 2020-02-21 | 2024-04-17 | 日本製鉄株式会社 | 支持構造、重力式防波堤及び重力式防波堤の施工方法 |
CN114855711B (zh) * | 2022-04-15 | 2024-01-30 | 广东万奥建设工程有限公司 | 一种高强抗震的宽体重力坝结构及其施工方法 |
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JPH0645929B2 (ja) * | 1986-12-05 | 1994-06-15 | 五洋建設株式会社 | 地盤の液状化防止工法 |
JP3624461B2 (ja) * | 1995-04-18 | 2005-03-02 | 株式会社大林組 | 岸壁の修復方法及び岸壁構造体 |
JP4058551B2 (ja) * | 1999-02-25 | 2008-03-12 | 鹿島建設株式会社 | 既設構造物の耐震補強工法 |
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