Development of a seismic damage evaluation method for embankments considering tensile failure of soil

考虑土体拉伸破坏的路堤震害评价方法的建立

• 批准号: 16310130
• 负责人: SAKAI Hisakazu
• 金额: $ 9.41万
• 依托单位: Ritsumeikan University (2006)National Research Institute for Earth Science and Disaster Prevention (2004-2005)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16310130/
• 关键词: tensile failure; constitute model; hollow-cylindrical torsional shear test; liquefaction; tension crack; particle method; river dike; large deformation; 動的モデル; 短周期地震動; 地震応答解析; 土構造物; 2次災害; 脆性挙動; 有限要素法; 広帯域強振動予測

(1)We studied about the effect of the change and hysteresis of anisotropic elastic constants, on the stress-strain relationship and the crackThe Ortiz model should be improved in case of cyclic loading.Accumulation of experimental data on vulnerability and ductility characteristic of soil is necessary for the establishment of the constitutive model.The number of cracks of soil on the reversed loading tests is larger than in the case of the repeated loading tests, for equal amplitude, hollow-cylindrical torsional shear tests.The relationship between the area of crack and the shear stiffness is strong and is independent of the amplitude of shear test and the difference between the reversed and repeated loading test.The tensile crack has a strong influence on the strength and deformation of soil.(2)Tensile splitting tests of kaolinite clay for different loading rates, show that soil has a larger tensile strength during faster loading. We consider that this effect is induced by suction.(3)We performed 2 dimensional FEM analyses for liquefaction-induced deformation for river dikes based on liquefiable soil layers. The results show that the seismic evaluation by the current methods may overestimate the river dikes safety during a subduction earthquake, and therefore application of the cumulative damage concept is necessary for the seismic evaluation.(4)Our results suggest that the evaluation methodology based on fault rupture process and site effect is useful for the damage estimation of embankments spread over a wide area.(5)We developed the deformation analytical methodology based on the moving particle semi-implicit method for the large deformation estimation of embankment considering tensile failure. Our methodology may be applied for the evaluation of deformed shape of a miniature model with liquefiable ground.

（1）我们研究了各向异性弹性常数的变化和滞后对应力 - 应变关系和裂纹模型的影响，应在循环负载的情况下改善Ortiz模型。实验数据的脆弱性和延性特征的实验性数据是在较大的IS组成部分的较大的lote架上的较大型号。测试，对于相等的振幅，空心的旋转剪切测试。裂纹面积与剪切刚度之间的关系很强，与剪切测试的振幅以及反向和重复的载荷测试之间的差异无关。拉伸裂纹对较大的土壤的强度和较大的clay lositile clay losities of Kayens of Kayens of tess的强度。在更快的加载过程中。我们认为这种效果是由吸力引起的。（3）我们对基于液化的土壤层进行了2维FEM分析，用于液化诱导的河堤的变形。结果表明，通过当前方法进行的地震评估可能高估了俯冲地震期间河流的安全性，因此对累积损害概念的应用对于地震评估是必要的。（4）我们的结果表明，基于故障破裂过程的评估方法表明，基于粒径的损害估算了粒子的损害，我们已经对域进行了分析（5）分析范围（5）。考虑拉伸故障的路堤的大变形估计。我们的方法可以用于评估具有液化地面微型模型的变形形状。