考虑应力路径影响下砂土的三维本构模型

Three-dimensional constitutive model of sand considering stress path

应力路径是影响土的应力-应变关系的一个重要因素。通过对一组砂土(日本Toyoura砂)三轴试验结果的详细分析,揭示了应力路径对剪应变及体积应变的影响规律,进而建立了能反映应力路径影响的应力-应变增量本构模型,提出的统一硬化参数反映了其剪胀特性,引入的变换应力能反映三维应力-应变特性。

The stress path is a very important factor effecting soil stress-strain relationship. A new stress-strain increment model considering stress path is proposed based on triaxial compression tests of Japanese Toyoura sand. The dilatancy of sand is described by use of a hardening parameter proposed by authors. The three-dimensional stress-strain behavior of sand is described by a transformed stress tensor based on the Spatially Mobilized Plane (SMP) criterion.