Study on damage constitutive model of structural Q2 loess under uniaxial compression
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摘要: 通过西安地区不同含水量的Q2黄土的单轴无侧限压缩试验研究表明,Q2原状黄土的单轴应力应变关系呈强软化型,单轴压缩曲线的转折点随着含水量的增加而不断降低,结构强度在低含水量下的降低幅度远大于高含水量下的降低幅度。在此基础上,根据Weibull统计分布理论和等效应变假定原理,同时考虑黄土的损伤门槛值,推导了单轴压缩条件下的黄土损伤本构方程。Abstract: The uniaxial compression test results of Q2 loess in various water contents in Xi’an show that the strain-stress relationship of Q2 natural loess is strong strain-soften type,the inflection point of the curve decreases with the increase of water content,and the decreasing degree of structural strength under lower water content is more than that under higher water content.On the basis of these,Weibull statistical distribution method,equivalent strain hypothesis theory and damage threshold value are used to determin the damage constitutive model of loess under uniaxial compression condition.
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Key words:
- structural loess /
- damage threshold value /
- constitutive model
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