CAJ | 학술논문

在砂砾料中掺入少量胶凝材料得到了一种新的低强度筑坝材料——Hardfill材料,其力学性能介于碾压混凝土和土石料之间,应力-应变关系具有明显的弹塑性性质和应变软化等特性.在已有研究的基础上,通过理论和数学分析,提出了能够反映Hardfill材料应变软化特性、参数物理意义较为明确的六参数非线性弹性本构模型,并给出了详细的参数确定过程.将该本构模型应用于坝高100m的Oyuk坝进行非线性有限元分析,结果表明:应用非线性本构模型计算所得坝体应力和变形分布规律与线弹性计算结果基本一致;因坝体应力水平较低,材料基本处于线弹性状态,非线性计算所得应力值与线弹性结果相差不大;而在坝趾等应力水平较高的部位,非线性计算所得应力集中值明显较小.
재사력료중참입소량효응재료득도료일충신적저강도축패재료——Hardfill재료,기역학성능개우년압혼응토화토석료지간,응력-응변관계구유명현적탄소성성질화응변연화등특성.재이유연구적기출상,통과이론화수학분석,제출료능구반영Hardfill재료응변연화특성、삼수물리의의교위명학적륙삼수비선성탄성본구모형,병급출료상세적삼수학정과정.장해본구모형응용우패고100m적Oyuk패진행비선성유한원분석,결과표명:응용비선성본구모형계산소득패체응력화변형분포규률여선탄성계산결과기본일치;인패체응력수평교저,재료기본처우선탄성상태,비선성계산소득응력치여선탄성결과상차불대;이재패지등응력수평교고적부위,비선성계산소득응력집중치명현교소.
Hardfill material is a new material with low strength in which the granular materials are solidi?fied with some cementing material. The nature of the special material is between RCC and soil,which has typical features as elastic-plastic material in its stress-strain relations and obvious behavior of strain soften?ing. On the summary of the early researches,a non-linear elasticity constitutive model for Hardfill material was put forth. The constitutive model can indicate the strain softening behavior accurately and all of the six parameters have specific physical interpretation and can be determined by material uniaxial and triaxial test using the given solution procedure. The verified constitutive model was applied to the Oyuk dam,a typical Hardfill dam at 100m level. The results show that the distribution of the stress and deformation is mainly accordant in both the non-linear and linear elastic calculation,and there is little difference because of the low stress level. However,the stress is obviously smaller in the non-linear calculation than the linear elas?tic result in the high stress level at the toe of the dam.