基于热力学方法的甲烷水合物沉积物本构模型  

Constitutive model of methane hydrate bearing sediment based on thermodynamic approach

作　　者：孙翔[1,2,3] 郭晓霞[1,2] 邵龙潭[1,2] 李洋辉[3] 

机构地区：[1]大连理工大学工程力学系,辽宁大连116024 [2]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024 [3]大连理工大学海洋能源利用与节能教育部重点实验室,辽宁大连116024

出　　处：《大连理工大学学报》2017年第2期111-118,共8页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(51309047;51509032);国家科技重大专项(2011ZX05026-004);中国博士后科学基金资助项目(2016790222)

摘　　要：甲烷水合物沉积物的力学特性研究尚处于起步阶段,较系统的试验数据仍然不够充分,能够描述甲烷水合物沉积物力学特性的本构模型也不多.基于热力学原理和临界状态的概念的本构模型,可以自动满足热力学定律,其流动法则和屈服函数都可以很自然地从耗散函数中导出.首先介绍了基于热力学方法的甲烷水合物沉积物本构模型,并利用已有的甲烷水合物沉积物的三轴试验数据对模型进行了验证,进一步地应用该模型分析应力间距比对甲烷水合物沉积物力学特性的影响,强调应力间距比和屈服面形状在模型构造中的重要性.模型参数分析表明,应力间距比对甲烷水合物沉积物排水和不排水应力-应变关系、有效应力路径以及剪胀关系都有明显的影响.The research on the mechanical behavior of methane hydrate bearing sediments （MHBS ） is still at the initial stage. The systematic test results are insufficient and the constitutive model which is used to describe the mechanical behavior of MHBS is rarely published and applied in engineering. The constitutive model based on thermodynamics and crit ical state concept is automatically satisfactory with the law of thermodynamics. The f low rule and yield function of this kind of model can be spontaneously derived from dissipative funct ion. Firstly , the derivation of the model is demonstrated, and certified by current tr iaxial test data. Then , by using this model the influence of stress spacing ratio on mechanical behavior of MHBS is analyzed and itis emphasized that the stress spacing ratio and the description of the shape of yield surface play important role in establishment of constitutive model. The analyses of model parameters indicate that the stress spacing ratio has obvious influenceon the drained and undrained stress-strain relat ionship, dilatancy and effective stress path of MHBS .

关 键 词：甲烷水合物沉积物 热力学 应力间距比 本构模型 

分 类 号：TU43[建筑科学—岩土工程]