An Investigation on Stability of Clay Ground Improved by Sand Compaction Piles

压实砂桩改良粘土地基稳定性研究

• 批准号: 63850112
• 负责人: NAKASE Akio
• 金额: $ 3.65万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63850112/
• 关键词: S.C.P.; Clay; Gravity Quay Wall; Backfilling; Lateral Resistance; Lateral Displacement; Stability; Model Tests; サンドコンパクションパイル; 盛土

A series of centrifuge tests was conducted in an attempt to study the effect of the weight of a caisson and the width and the area ratio of improvement by sand Compaction piles(S.C.P.) on the stability of improved ground under a backfilled caisson. Following conclusions are derived from this study. l.Horizontal deformations are much more dominant than vertical deformations when a backfilled caisson is built on soft clay improved with S.C.P. 2. For improved ground, a well-defined circular slip surface is observed. However for improved ground, horizontal deformations increase gradually with the increase of horizontal load and at a certain load the horizontal deformations suddenly start to increase, showing no slip surface in the ground. This leads to a conclusion that consideration of horizontal deformations is more important than that of stability against failure for this type of structure. 3. When the safety factor calculated by the modified Fellenius' stability analysis exceeds 1.4, considerable horizontal deformation appear. This leads to a conclusion that the minimum safety factor for this type of problem should be taken as 1.5.

进行了一系列离心测试，以研究凯森（Caisson）的重量以及砂压桩（S.C.P。）对改善的宽度和面积比的影响，对回填料箱下改善地面的稳定性。以下结论来自这项研究。当通过S.C.P.改进的软粘土建立回填的凯森（S.C.P. 2。为了改善地面，观察到明确的圆形滑动表面。但是，为了改善地面，水平变形随着水平负荷的增加而逐渐增加，在一定负荷下，水平变形突然开始增加，在地面上没有滑动地面。这得出的结论是，考虑到水平变形比这种类型的结构的稳定性更重要。 3。当修改后的Fellenius稳定性分析计算的安全系数超过1.4时，出现了相当大的水平变形。这得出的结论是，这种类型的问题的最低安全因素应为1.5。

项目成果

飯島興二,広岡明彦,竹村次朗,中瀬明男: "盛工荷重を受けたSCP地盤の安定性について" 第24回土質工学研究発表会講演概要集. 2. 1895-1896 (1989)

Koji Iijima、Akihiko Hirooka、Jiro Takemura、Akio Nakase：“论路堤荷载作用下 SCP 地面的稳定性”第 24 届土壤工程研究会议讲座摘要 2。1895-1896 (1989)。

Ootsuka, J., Takemura, J.Okadome, K. and Nakase, A.: "The stability of caisson wall on soft clay improved by S.C.P.." Procs.24th Annual Conference of Japanese Society of Soil Mechanics and Foundation Engineering, Vol.1, pp. 1897-1898, 1989.

Ootsuka, J.、Takemura, J.Okadome, K. 和 Nakase, A.：“软粘土上沉箱墙的稳定性通过 S.C.P. 得到改善”，日本土壤力学与基础工程学会第 24 届年会，卷。

Watabe, Y., Suemasa, N., Takemura, J., Nakase, A. and Hirooka, A.: "Stability of soft clay improved with S.C.P. supporting backfilled gravity caisson." Procs.25th Annual Conference of Japanese Society of Soil Mechanics and Foundation Engineering, 1990.

Watabe, Y.、Suemasa, N.、Takemura, J.、Nakase, A. 和 Hirooka, A.：“通过 S.C.P. 支撑回填重力沉箱提高了软粘土的稳定性。”

大塚寿一,竹村次朗,岡留孝一,中瀬明男: "SCP地盤上の重力式護岸の安定性に関する研究" 第24回土質工学研究発表会講演概要集. 2. 1897-1898 (1989)

Juichi Otsuka，Jiro Takemura，Koichi Okadome，Akio Nakase：“SCP地面重力式护岸稳定性研究”第24届土壤工程研究会议摘要2。1897-1898（1989）。

飯島興二,広岡明彦,竹村次朗,中瀬明男: 第24回土質工学研究発表会講演概要集. (1989)

Koji Iijima、Akihiko Hirooka、Jiro Takemura、Akio Nakase：第 24 届土壤工程研究会议摘要集（1989 年）。