CAJ | 학술논문

筑坝材料的动力变形特性是进行大坝动力反应分析的基本依据之一,采用等效粘弹性模型计算时主要包括最大动剪模量Gmax与平均有效主应力的关系,动剪模量比G/Gmax与动剪应变幅γd的关系以及阻尼比λ与动剪应变幅γd的关系等。这些关系反映了在动荷载作用下土的应力应变关系的非线性与粘滞性特征。双江口水电站坝体材料及覆盖层坝基动力特性试验由两种试验方法同时进行,本文通过对比综合两种方法的试验参数。结果表明两种方法在不同的动应变区间有差异,应根据不同的计算模型选择使用。
축패재료적동력변형특성시진행대패동력반응분석적기본의거지일,채용등효점탄성모형계산시주요포괄최대동전모량Gmax여평균유효주응력적관계,동전모량비G/Gmax여동전응변폭γd적관계이급조니비λ여동전응변폭γd적관계등。저사관계반영료재동하재작용하토적응력응변관계적비선성여점체성특정。쌍강구수전참패체재료급복개층패기동력특성시험유량충시험방법동시진행,본문통과대비종합량충방법적시험삼수。결과표명량충방법재불동적동응변구간유차이,응근거불동적계산모형선택사용。
The dynamic deformation characteristics of dam materials is one of the bases of analyzing the dynamic response of the dam.The calculation with equivalent viscoelastic model includes the relationships between the maximum dynamic shear modulus Gmax and average effective principal stress,between the dynamic shear modulus ratio G/Gmax and dynamic shear strain amplitude γd,between the damping ratio λ and dynamic shear strain amplitude γd and so on.These relationships reflect the nonlinear and viscous characteristics of stress-strain relationship of the soil under dynamic loading.The tests of dynamic deformation characteristics of the dam materials of Shuangjiangkou Hydropower Station are conducted by using two test methods at the same time.The parameters of the two test methods are compared here,the results show that the dynamic strain area is different in these two methods,which should be chosen based on different calculation models.