Seismic reinforcing of existing soil structures and advanced application of soil reinforcing technology to construction of highly aseismic environment-friendly soil structures

既有土结构抗震加固及土体加固技术在高抗震环境友好土结构建设中的先进应用

基本信息

批准号：
13852011
负责人：
TATSUOKA Fumio
金额：
$ 65.06万
依托单位：
Tokyo University of Science (2004-2005)The University of Tokyo (2001-2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (S)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2005
项目状态：
已结题

项目摘要

The strength and deformation characteristics of geosynthetic reinforcement when subjected to sustained and cyclic loading were evaluated by performing a comprehensive series of tensile loading tests. By analyzing results from tests lasting for up to 30 days, a constitutive model that can fully explain the test results was developed. The residual deformation characteristics of backfill, which is another constituting material of geosynthetic-reinforced soil structure, were evaluated by performing sustained and cyclic loading triaxial tests on a variety of backfill material. The test results were analysed to obtain empirical equations that are to be incorporated into numerical analysis. Moreover, model loading tests on geosynthetic-reinforced soil structures, including retaining walls, and level grounds were performed under plane strain conditions to validate the numerical analysis method. In particular, the effects of sustained and cyclic loading on the deformation of geosynthetic-reinfo … More rced soil structure were studied evaluating the possibility of creep rupture failure of geosynthetic reinforcement and the effects of preloading and prestressing. A FEM code to simulate model behaviour as observed above was developed. Finally, the feasibility of the use of crushed concrete as the backfill of geosynthetic-reinforced soil structures allowing a limited amount of instantaneous and residual deformation was studied by performing consolidated drained triaxial compression tests on specimens having a wide range of density and at a wide range of confining pressure. In particular, triaxial compression tests on 30 cm-diameter and 60 cm-high specimen of a crushed concrete available in the field were performed. It was found that, when highly compacted, the strength and stiffness of crushed concrete becomes as high as the best backfill material (i.e., well-graded crushed hard rock). This trend did not change when increasing the confining pressure up to 600 kPa. The strength and stiffness of cement-mixed crushed concrete were also as good as cement-mixed well-graded crushed hard rock in drained triaxial compression. Less

通过进行一系列全面的拉伸载荷测试，评估了持续和循环载荷时，地质加强的强度和变形特性。通过分析持续30天的测试结果，可以完全解释测试结果的建设性模型。回填的残留变形特性是通过对各种回填材料进行持续的循环加载三轴测试来评估地质增强土壤结构的另一种构造材料。分析了测试结果，以获取要纳入数值分析的经验方程。此外，在平面应变条件下进行了验证数值分析方法，对地质增强土壤结构（包括固定壁和水平的地面）进行了模型加载测试。特别是，持续和循环载荷对地球联合增强土壤结构的变形的影响是研究了地理合成增强的蠕变破裂失败的可能性以及预加载和预应力的影响。如上所述，开发了模拟模型行为的FEM代码。最后，通过对具有较大密度范围和宽范围宽范围的宽范围的物种进行巩固的三轴压缩测试，研究了使用压碎混凝土作为地球合并增强的土壤结构的可行性。特别是，进行了30 cm直径和60 cm高的标本的三轴压缩测试，该试验在现场可用。人们发现，当高度压实时，压碎混凝土的强度和刚度变得与最好的回填材料一样高（即，挤压的碎石岩石）。当将限制压力增加到600 kPa时，这种趋势并没有改变。水泥混凝土的强度和刚度也与排水三轴压缩中的水泥混合粉碎的硬岩一样好。较少的