A fundamental Study on stability of under ground large structures subjecting buoyant forces

地下大型结构受浮力稳定性的基础研究

• 批准号: 05555133
• 负责人: TAKEMURA Jiro
• 金额: $ 7.36万
• 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 (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555133/
• 关键词: under ground structure; buoyant forces; depth of cover; loading rate; sand; uplift force; 浮き上がり量; 引き上げ荷重; 土被り厚さ

Because of shortage of land space, coastal areas in Japan have been developed and scale of structures become larger and larger in recent years. Large under ground structures in areas of high ground water table might be subjected to large buoyant forces. In this study a series of centrifuge tests were carried out to investigate the influences of depth, size, shape, and flexibility of under ground structures and loading rate on the stability of ground. Stability analyzes are also carried out by using the upper bound method and finite element method. Following conclusions were found ;(1) The ultimate uplift capacity of structures in sand increases rapidly with increasing in a ratio of depth of cover to width of structures. Calculated ultimate capacity from limit equilibrium method using observed failure mechanism agree well with that measured.(2) A flexibility of tunnel influences considerably on circumferential stress of tunnel lining ; relatively flexible tunnel could increase its width horizontally, which results in relatively uniform circumferential stress distribution while circumferential stress concentrates on around springline of rigid tunnel.

近年来，由于陆地空间的不足，日本沿海地区得到了开发，建筑物的规模越来越大。在地下水位高的地区，大型地下结构可能会受到很大的浮力。本文通过一系列的离心试验，研究了地下结构的深度、尺寸、形状、柔度以及加载速率对地基稳定性的影响。采用上限法和有限元法对该结构进行了稳定性分析。研究结果表明：（1）砂土中结构物的极限抗拔承载力随着结构物深宽比的增大而迅速增大;采用极限平衡法计算的极限承载力与实测结果吻合较好。(2)隧道的柔性对隧道衬砌的环向应力影响较大，相对柔性的隧道可以增加其横向宽度，从而使环向应力分布相对均匀，而刚性隧道的环向应力集中在弹接线附近。

项目成果

M.Seido, K.Yashiro, M.Okamura, J.Kuwano and A.Onoue: "Centrifuge model tests on excavation in a stacked drift tunnel in saturated soils." Proc.30th Japan National Conf.on SMFE. (to be apear). (1994)

M.Seido、K.Yashiro、M.Okamura、J.Kuwano 和 A.Onoue：“饱和土中堆积式巷道开挖的离心模型试验。”

野城一栄,塩梅崇,岡村未対,竹村次朗,木村孟: "上向き力を受ける砂地盤中の地下構造物の安定性" 第29回土質工学研究発表会講演集. 3. 2009-2012 (1994)

Kazuei Nojo，Takashi Shiome，Mitai Okamura，Jiro Takemura，Meng Kimura：“向上力作用下沙地地下结构的稳定性”第29届土壤工程研究会议论文集3. 2009-2012（1994）。

野城一栄,塩梅崇,岡村未対,竹村次朗,木村孟: "上向きの力を受ける砂地盤中の地下構造物の安定性" 第29回土質工学研究発表会講演集. (1994)

Kazuei Nojo、Takashi Shiome、Mitai Okamura、Jiro Takemura、Meng Kimura：“沙地地下结构在向上力作用下的稳定性”第 29 届土壤工程研究会议论文集（1994 年）。

清藤幹雄,野城一栄,岡村未対,桑野次郎,尾上篤生: "飽和地盤中の積層導坑トンネルの内部土掘削時の挙動" 第30回土質工学研究発表会講演集. (投稿中). (1995)

Mikio Seito、Kazue Noshiro、Mitai Okamura、Jiro Kuwano、Atsuo Onoe：“饱和地面中叠层竖井隧道内部土体开挖的行为”第 30 届土壤工程研究会议论文集（目前正在提交）。

酒井貴之、岡村未対、竹村次朗、木村孟、尾上篤生: "積層導抗トンネルの内部土堀削時挙動について" 第29回土質工学研究発表会講演集. 3. 1983-1986 (1994)

Takayuki Sakai，Mitai Okamura，Jiro Takemura，Meng Kimura，Atsuo Onoue：“关于叠层导电隧道内部土壤开挖过程中的行为”第29届土壤工程研究会议论文集3。1983-1986（1994）。