基于统一硬化参量的海洋K_(0)固结土动力本构模型  

Dynamic constitutive model of marine K_(0) consolidated soil based on unified hardening parameters

作　　者：吴有平 伏亮明 胡达 张靖 黎永索[3] WU Youping;FU Liangming;HU Da;ZHANG Jing;LI Yongsuo(PowerChina Zhongnan Engineering Corporation Limited,Changsha 410014,China;School of Civil Engineering,Wuhan University,Wuhan 430072,China;College of Civil Engineering,Hunan City University,Yiyang 413000,China)

机构地区：[1]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014 [2]武汉大学土木建筑工程学院,湖北武汉430072 [3]湖南城市学院土木工程学院,湖南益阳413000

出　　处：《水资源与水工程学报》2021年第1期213-219,共7页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(51678226);湖南省自然科学基金项目(2019JJ50030)。

摘　　要：为方便海洋工程中桩土相互作用计算,根据海洋K_(0)固结土体特性,对现有相关土体本构模型进行简化。在修正剑桥模型的基础上,基于热力学理论,选用耗散功作为硬化参量,结合原状土体的固结属性,推导了适用于黏土与砂土的统一硬化模型。在此基础上,通过采用旋转硬化与等向硬化相结合的硬化理论来表征K_(0)固结土在循环荷载作用下的硬化规律,同时引入屈服面收缩参数Θ来描述循环荷载加载过程中土体屈服面的演化特性,进而建立了循环荷载下海洋K_(0)固结土体统一硬化模型。为验证本文提出的本构模型的合理性,开展了2个案例的对比研究,研究结果表明:新提出的统一硬化模型的计算值与实测值吻合,选用的计算参数少且物理意义明确。In order to facilitate the calculation of pile-soil interaction in marine engineering,the existing soil constitutive model is simplified taking into consideration the characteristics of marine K_(0)consolidated soil.On the basis of the modified Cam-Clay model and thermodynamics theory,a unified hardening model for clay and sand is derived combined with the consolidation property of undisturbed soil,using the dissipative work as the hardening parameter.Based on the derived model,the hardening law of K_(0)consolidated soil under cyclic load is achieved by combining rotation hardening with isotropic hardening.And the shrinkage parameterΘof yield surface is introduced to describe the evolution of soil yield surface under cyclic load,and then a unified hardening model of marine K_(0)consolidated soil under cyclic load is established.A comparative study of two cases is carried out to verify the proposed constitutive model.The results show that the calculated value of the new unified hardening model is in agreement with the measured value,and the new model adopts fewer calculation parameters with clear physical significance.

关 键 词：循环荷载 海洋K_(0)固结土 统一硬化模型 耗散功 

分 类 号：TU43[建筑科学—岩土工程]