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用基于Perzyna超应力理论与修正剑桥模型的简单的弹黏塑性本构模型,耦合比奥固结理论,来模拟堤坝荷载作用下的软土的速率效应特性。以土工织布加固的堤坝为实例,提出从最初几个加载阶段下的沉降数据来确定黏性参数的反分析法。根据反分析的参数值来模拟,同实测值予以比较,并同文献中使用其他四个不同本构模型的模拟结果进行比较,比较研究表明:本文建议的模型具有优越性。特别研究了土工织布加固对堤坝下软土的滞后变形和稳定性的影响。良好的模拟结果反应了所提出的反分析法的可用性,同时展示了所使用的弹黏塑性本构模型在岩土工程中的实用性:弥补了修正剑桥模型不能模拟速率效应特性的缺点;跟其他黏塑性本构模型比较,本模型参数确定方法简单,模拟结果准确。
A simple elastic visco-plastic constitutive model based on Perzyna’s super-stress theory and a modified Cambridge model was used to simulate the velocity-response characteristics of soft soil under bank loading. Taking the dike reinforced by geotextile as an example, an inverse analysis method was proposed to determine the viscosity parameters from the sedimentation data in the first few loading stages. According to the inverse analysis of the parameter values to simulate the actual measured values are compared with the literature using the simulation of the other four different constitutive models were compared and the results show that: The proposed model has the advantages. In particular, the effect of geotextile reinforcement on the hysteresis deformation and stability of soft soil under dikes was studied. Good simulation results reflect the usability of the proposed inverse analysis method and demonstrate the practicability of the elasto-viscoplastic constitutive model used in geotechnical engineering: to make up for the shortcomings that the modified Cambridge model can not simulate the rate-dependent properties; Compared with other visco-plastic constitutive models, the method of parameter determination of this model is simple and the simulation results are accurate.