A Study on Limit State Design of Ground Structures by Dilatational Strain Energy

基于膨胀应变能的地面结构极限状态设计研究

• 批准号: 08455208
• 负责人: NISHIOKA Takashi
• 金额: $ 2.82万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455208/
• 关键词: Limit Seismic Intensity; Ground Structures; Stability of the Ground; Mean Stress; Internal Friction Angle; Cohesion; Earthquake Reistance of the ground; Drucker-Pragar's Yield Condition; 形状弾性ひずみエネルギー; 終局限界状態; 地盤; トンネル; 地震; 降伏条件; 関連流水則; 滑り線

The purpose of this paper is to make clear the ground stability around tunnel structures in earthquake by using dilatational elastic strain energy generated in the ground and to find proper index for earthquake resistance of the ground around tunnel structures.In Chapter 1, the stability of earth materials under plane strain condition is discussed by using dilatational elastic strain energy When dilatational elastic strain energy in the ground reaches its maximum defined by cohesion, internal friction angle and mean stress of the ground, shear zone spreads in the ground. The direction of shear zone is decided by the dilatational angle and internal friction angle of the ground.In Chapter 2 and 3, the earthquake resistance of the ground around the box tunnel and shield tunnel is discussed by quasi-static analysis of elasto-plastic finite element method. Limit Seismic Intensity is defined as the time when shear zone connects between ground surface and upper parts of tunnels, as the seismic intensity increases. Aocording to FEM calculation, it is shown that LSI depends on cohesion, internal friction angle and mean stress of the ground.In Chapter 4, dynamic response calculation in earthquake shows that LSI is the good index for earthquake resistance design of the ground around structures, because DSI shows the largest intensity of the ground than in dynamic response calculation.The Chapter 5 is the conclusion.

本文的目的是利用地震作用下隧道结构周围土体产生的弹性应变能来研究地震作用下隧道结构周围土体的稳定性，并寻求合理的隧道结构周围土体的抗震指标。本文用弹性应变能的概念讨论了平面应变条件下土体材料的稳定性问题。当土体的粘聚力、内摩擦角和平均应力达到最大值时，剪切带在土体中扩展。第二、三章分别采用弹塑性有限元拟静力分析方法对箱形隧道和盾构隧道周围土体的抗震性能进行了研究。极限地震烈度定义为随着地震烈度的增加，地表与隧道上部剪切带连接的时间。通过有限元计算表明，LSI取决于地基的粘聚力、内摩擦角和平均应力，第四章通过地震动力反应计算表明，LSI是结构周围地基抗震设计的较好指标，因为DSI比动力反应计算所反映的地基强度大，第五章是结论。

项目成果

Masaharu KIKKAWA & Takashi NISHIOKA: ""Collapse of Earth Materials under Compression"" Proc.of Tunnel Eng.Vol.8. 71-78 (1998)

吉川正治

吉川正治・西岡隆: "圧縮状態における地盤材料の破壊に関する研究" トンネル工学研究論文・報告集. 8. 71-78 (1998)

Masaharu Yoshikawa 和 Takashi Nishioka：“地基材料受压断裂的研究”隧道工程研究论文和报告（1998）。

西岡 隆: "シールドトンネルの地震時終局状態について" トンネル工学研究論文報告集. Vol.7. 343-348 (1997)

Takashi Nishioka：“关于地震期间盾构隧道的最终状态”隧道工程研究论文集第 7 卷（1997 年）。

西岡 隆: "シールドトンネルの地震時終局状態について" トンネル工学研究論文・報告集. 7. 343-348 (1997)

Takashi Nishioka：“关于地震期间盾构隧道的最终状态”隧道工程研究论文和报告，7. 343-348 (1997)。

Takashi NISIOKA: ""Ultimate State of Shield-tunnels Under Earthquakes"" Proc.of Tunnel Eng.Vol.7. 343-348 (1997)

Takashi NISIOKA：“地震下盾构隧道的终极状态”Proc.of Tunnel Eng.Vol.7。