亚塑性模型对土-结构相互作用问题的预测能力分析  

Analysis of prediction ability of hypoplastic model for soil-structure interaction problem

作　　者：刁红国 王新泉 魏纲 崔允亮 张天赐 DIAO Hongguo;WANG Xinquan;WEI Gang;CUI Yunliang;ZHANG Tianci(School of Engineering,Zhejiang University City College,Hangzhou 310015,China;Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province,Hangzhou 310015,China;Zhejiang Engineering Research Center of Intelligent Urban Infrastructure,Hangzhou 310015,China)

机构地区：[1]浙大城市学院工程学院,浙江杭州310015 [2]浙江省城市盾构隧道安全建造与智能养护重点实验室,浙江杭州310015 [3]城市基础设施智能化浙江省工程研究中心,浙江杭州310015

出　　处：《自然灾害学报》2022年第4期210-218,共9页Journal of Natural Disasters

基　　金：国家自然科学基金项目(52009122);浙江省自然科学基金项目(LQ21E090002);浙江省教育厅一般科研项目(Y201941345)。

摘　　要：土是一种复杂的多相介质材料,采用能够真实反映其材料特性的本构模型对于数值模拟计算结果的可靠度至关重要。文中以土-结构相互作用问题的离心模型试验为基础,采用ABAQUS建立相应的数值模型,分别采用理想弹塑性Mohr-Coulomb和亚塑性2种本构模型,以及模型尺寸和原型尺寸2种建模方法进行计算分析,探究2种因素对预测结果的影响。研究表明:与离心模型试验结果相比,采用Mohr-Coulomb本构模型高估了桩身大部分水平位移和弯矩,而亚塑性本构模型可以描述土体在小应变条件下的应变依赖和应力路径依赖性,其计算结果与试验结果的吻合性更好;只要实现土体的应力水平与原型场地一致,2种建模方法对模拟结果的影响不大。研究结果有助于提高土-结构相互作用问题的预测能力,为实际工程设计和施工提供参考。Since soil is a complex multiphase dielectric material,whether the constitutive model can truly reflect soil properties is very important for the reliability of the numerical results. Based on a centrifugal model test of the soil-structure interaction problem,the corresponding numerical model was established using ABAQUS. Two different constitutive models including ideal elastoplastic Mohr-Coulomb and hypoplastic model were adopted,as well as two modeling methods including the model size and the prototype size. Compared with the measured results in the centrifugal model test,the numerical results using Mohr-Coulomb constitutive model overestimated most of the pile deflection and bending moment. Owing to the hypoplastic constitutive model could describe the strain-dependent and stress path-dependent of soil stiffness under small strain conditions,the calculated results were in better agreement with the test results. As long as the soil stress level was consistent with the prototype site,the two modeling methods have little effect on the numerical results. The research results are helpful to improve the prediction ability of soil-structure interaction problems,and provide reference for engineering design and construction.

关 键 词：土-结构相互作用 小应变 数值分析 本构模型 模型尺寸 

分 类 号：TU41[建筑科学—岩土工程] X43[建筑科学—土工工程]