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Experimental study on strain rate effect of strength characteristics of unsaturated silty clay

机译：不饱和粉质强度特征应变率效应的实验研究

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摘要

Strain rate is a key factor affecting the strength characteristics of soil. The intrinsic mechanism of the strain rate effect was investigated through a case study on unsaturated compacted silty clays, where triaxial tests with elven strain rates and six confining pressures ranging from 5×10?7～1×10?3s?1and 50～400 kPa, respectively, were conducted. Then, the effects of strain rate on multiple strength and deformation parameters of the sample, including the stress-strain relationship, failure mode, peak strength, peak strain, and elastic modulus, were analyzed to clarify the inherent mechanism of the strain rate effect. The results showed that there were two types of critical strain rate values, which caused the peak strength to first decrease and then increase with strain rate under low confining pressures. However, under high confining pressures, the peak strength first followed the same trend as low confining pressure, but then it decreased with increased strain rate. Additionally, the elastic modulus increased monotonically with strain rate under low confining pressures, but while under high confining pressures it first decreased and then increased. Finally, linear functions and quadratic polynomials were derived to describe the effect of strain rate on the strength and deformation parameters of silty clay to facilitate engineering applications.
机译：应变率是影响土壤强度特性的关键因素。通过对不饱和压实的粉质粘土的案例研究研究了应变速率效应的内在机制，其中三轴试验具有精华菌株的率和六个限制压力，范围为5×10？7〜1×10？3S？1 50〜400 KPA分别进行。然后，分析了应变率对样品的多强度和变形参数的影响，包括应力 - 应变关系，失效模式，峰强度，峰值应变和弹性模量，以阐明应变率效应的固有机理。结果表明，存在两种类型的临界应变速率值，这导致峰值强度首先降低，然后在低限制压力下以应变率的增加而增加。然而，在高限制压力下，峰值强度首先呈现与低限制压力相同的趋势，但随后它随着应变率的增加而降低。另外，弹性模量在低限制压力下单调的应变速率随菌株，但在高限制压力下，它首先降低，然后增加。最后，推导出线性函数和二次多项式来描述应变率对粉质粘土强度和变形参数的影响，以促进工程应用。

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