Study on rational procedures to evaluate seismic stability of retaining walls

挡土墙抗震稳定性评价合理程序研究

• 批准号: 08555119
• 负责人: KOSEKI Junichi
• 金额: $ 7.1万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555119/
• 关键词: Retaining walls; Reinforced-soil retaining walls; Seismic design; Back analysis; Model test; Earth pressure; Pseudo-static method; Hyogoken-nanbu earthquake; 補強土

In order to establish rational procedures to evaluate seismic stability of retaining walls, back analyzes of retaining walls for railway embankments damaged by the 1995 Hyogoken-nanbu earthquake, shaking and tilt table model tests on a variety of retaining walls, and investigations to evaluate active earth pressures at high seismic load levels were conducted.The back analyzes revealed that there exists a big gap between the design horizontal coefficients used in the current pseudo-static seismic design approaches for retaining walls and the peak ground acceleration divided by the gravitational acceleration experienced by a number of RWs during the 1995 Hyogo-ken-nambu Earthquake. In the tilt table tests, irrespective of wall type, a failure plane or a set of failure planes developed in the backfill associated with the active failure in the backfill, followed by the ultimate failure or collapse of wall only at a slightly larger tilting angle. On the other hand, in the shaking table tests, the ultimate failure or collapse of wall occurred at a much later stage associated with relative large deformation and displacement of wall occurring after the first active failure plane developed in the backfill.Based on the above results, a modified pseudo-static and limit-equilibrium approach to evaluate active earth pressure at high seismic load levels is proposed. Although it is similar to the Mononobe-Okabe method, the proposed method considers the effects of strain localization in the backfill soil and associated post-peak reduction in the shear resistance from peak to residual values along a previously formed failure plane.

为了建立合理的挡土墙抗震稳定性评价方法，对1995年兵库县南部地震中受损的铁路路基挡土墙进行了反分析，对各种挡土墙进行了振动台和倾斜台模型试验，反分析结果表明，设计水平与实际水平存在较大差距挡土墙当前拟静力抗震设计方法中使用的系数，以及峰值地面加速度除以1995年兵库县南部地震期间许多RW所经历的重力加速度。在倾斜台试验中，无论墙的类型，一个或一组破坏面发展在回填土中与主动破坏回填土，随后的最终破坏或倒塌的墙只有在稍大的倾斜角。另一方面，在振动台试验中，墙的最终破坏或倒塌发生在很晚的阶段，与相对较大的变形和位移发生在第一个主动破坏面在回填土中发展。虽然它是类似的Mononobe-Okabe方法，所提出的方法考虑了应变局部化的影响，在回填土和相关的峰后减少的抗剪强度从峰值到剩余值沿着先前形成的故障平面。

项目成果

Tatsuoka, F., Koseki, J., Tateyama, M., Munaf, Y.and Horii, K.: "Seismic stability against high seismic loads of geosynthetic-reinforced soil retaining structures" Proc.6th Int.Conf.on Geosynthetics, Atlanta. (printing). (1998)

Tatsuoka, F.、Koseki, J.、Tateyama, M.、Munaf, Y. 和 Horii, K.：“土工合成材料加筋挡土结构抗高地震荷载的地震稳定性”Proc.6th Int.Conf.on Geosynthetics，

Koseki, J., Tateyama, M., Tatsuoka, F.and Horii K.: "Back analyzes of soil retaining walls for railway embankments damaged by the 1995 Hyogoken-nanbu earthquake" The 1995 Hyogoken-nanbu Earthquake-Investigation into Damage to Civil Engineering Structures-

Koseki, J.、Tateyama, M.、Tatsuoka, F. 和 Horii K.：“1995 年兵库县南部地震损坏的铁路路堤挡土墙的回溯分析” 1995 年兵库县南部地震 - 土木损失调查

Koseki, J., Tatsuoka, F., Munaf, Y., Tateyama, M.and Kojima, K.: "A modified procedure to evaluate active earth pressure at high seismic loads" Soils and Foundations. (to be published). (1998)

Koseki, J.、Tatsuoka, F.、Munaf, Y.、Tateyama, M. 和 Kojima, K.：“评估高地震荷载下主动土压力的改进程序”土壤和地基。

J.Koseki,M.Tateyama,F.Tatsuoka: "Back analyses of soil retaining walls for railway embankments damaged by the 1995 Hyogoken-nanbu earthquake" The 1995 Hyogoken-nanbu Earthquake-Investigation into Damage to Civil Engineering Structures-Committee of Earthqu

J.Koseki、M.Tateyama、F.Tatsuoka：“1995 年兵库县南部地震损坏的铁路路堤土挡墙的回溯分析” 1995 年兵库县南部地震 - 土木工程结构损坏调查 - 地震委员会

Tatuoka,F. ほか: "Seismic stability against high seismic loads of geosynthetic-reinforced soil retaining structures" Proc.of 6th International Conference on Geosynthetics. (印刷中).

Tatuoka, F. 等人：“土工合成材料加固土壤保持结构抗高地震荷载的地震稳定性”，第六届国际土工合成材料会议论文集（正在出版）。