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

通过一系列的拉伸试验，研究了土工合成材料加筋体在持续荷载和循环荷载作用下的强度和变形特性。通过对长达30天的试验结果进行分析，建立了能够充分解释试验结果的本构模型。通过对多种回填材料进行持续和循环加载三轴试验，评价了土工合成材料加筋土结构的另一种组成材料--回填材料的残余变形特性。对试验结果进行了分析，得到了经验公式，并将其纳入数值分析。此外，土工合成材料加筋土结构，包括挡土墙，平面应变条件下进行的模型加载试验，以验证数值分析方法。特别是持续荷载和循环荷载对土工合成材料-加筋材料变形的影响， ...更多信息 对加筋土结构进行了研究，评价了土工合成材料加筋蠕变破坏的可能性以及预压和预应力的效果。开发了一个有限元代码来模拟上述模型行为。最后，通过对具有宽范围密度和宽范围围压的试样进行固结排水三轴压缩试验，研究了使用破碎混凝土作为允许有限瞬时和残余变形的土工合成材料加筋土结构回填的可行性。特别是，三轴压缩试验的30厘米直径和60厘米高的样本粉碎混凝土在现场进行。已经发现，当高度压实时，压碎的混凝土的强度和刚度变得与最佳回填材料一样高（即，级配良好的破碎硬岩）。当围压增加到600 kPa时，这种趋势没有改变。在排水三轴压缩条件下，水泥混凝土的强度和刚度与级配良好的水泥碎石相当。少

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