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| 基于热力学方法的水合物沉积物本构模型 |
| The constitutive model of methane hydrate bearing sediment based on thermodynamic approach |
| 投稿时间：2016-08-20 修订日期：2016-10-08 |
| DOI： |
| 中文关键词: 关 键 词：水合物沉积物 热力学 应力间距比 本构关系 |
| 英文关键词: MHBS thermodynamics stress spacing ratio constitutive model |
| 基金项目:国家自然科学基金(51309047； 51509032)；国家科技重大专项(2011ZX05026-004) |
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| 中文摘要: |
| 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的从耗散函数中导出。本文首先介绍了基于热力学方法的水合物沉积物本构模型,并利用已有的水合物沉积物的三轴试验数据对模型进行了验证,进一步的应用该模型分析应力间距比对水合物沉积物力学特性的影响,强调应力间距比在模型构造中的重要性。模型参数分析表明,应力间距比对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。 |
| 英文摘要: |
| The research on the mechanical behavior of methane hydrate bearing sediments is at the initial stage. The systematic test results are insufficient and the constitutive model which is used to describe the mechanical behavior of methane hydrate bearing sediments is rarely published and applied within engineering. The constitutive model based on thermodynamics and critical state concept is satisfactory with the law of thermodynamics. The flow rule and yield surface of this kind of model can be spontaneously derived from dissipative function. We demonstrate the derivation of the model in this paper, certificate the model by current test data, apply the model in analyzing the influence of spacing ratio on mechanical behavior of methane hydrate bearing sediment and emphasize that the spacing ratio and the description of the shape of yield surface play an important role in establishment of constitutive model. The analysis of model parameters indicates that the spacing ratio has influence on the drained and undrained triaxial stress-strain relationship, dilatancy and effective stress path of methane hydrate bearing sediments. |
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