考虑深海能源土结构性的统一硬化模型
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青岛理工大学 理学院,青岛理工大学 理学院,青岛理工大学 理学院

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TU43

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11572165-天然气水合物分解诱发深海能源土斜坡静力液化失稳机理与模拟;51778311-土的应力方向依赖性的宏细观关联与本构模拟研究


Unified Model for Gas Hydrate Bearing Sediments Considering Structure
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Qingdao University of Technology,,,

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    摘要:

    从定性和定量两方面对能源土的力学行为进行描述和计算,是高效安全开发天然气水合物资源的重要前提。基于结构性突变屈服破坏机理,可认为能源土结构性突变前为弹性变形,突变后为弹塑性变形。在统一硬化模型(UH模型)的框架下引入结构性屈服压力,采用统一硬化参数和关联流动法则,构建了一个可以考虑能源土结构性的本构模型。相对于UH模型,改进的模型只增加了结构性屈服压力这一个参数,用以反映初始固结压力和水合物饱和度的综合影响。通过模型探讨和试验对比,所提模型能够在定量上吻合能源土的应力-应变关系,能在定性上反映能源土的剪胀特点。

    Abstract:

    To describe and calculate the mechanical behavior of energy soil from both qualitative and quantitative aspects is an important prerequisite for the efficient and safe development of natural gas hydrate resources. Based on the mechanism of structural abrupt yield failure, it can be considered that the deformation of energy soil is elastic and elastoplastic respectively before and after structural abrupt. The structural yield pressure is introduced into the Unified Hardening (UH) model, and an elastic-plastic constitutive model of energy soil which can consider its structure is constructed by using the unified hardening parameter and the associated flow rule. Compared with the UH model, the improved model only adds one parameter, i.e. structural yield pressure, to reflect the combined effect of initial consolidation pressure and hydrate saturation. By discussing and comparing the model prediction and experimental data, it shows that the model can simulate the stress-strain relationship of energy soil well, and can reflect the variation of the dilatancy characteristics of energy soil.

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袁庆盟,孔亮,刘锐明,等. 考虑深海能源土结构性的统一硬化模型[J]. 科学技术与工程, 2018, 18(32): .
YuanQingmeng,, and. Unified Model for Gas Hydrate Bearing Sediments Considering Structure[J]. Science Technology and Engineering,2018,18(32).

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历史
  • 收稿日期:2018-07-05
  • 最后修改日期:2018-09-12
  • 录用日期:2018-09-14
  • 在线发布日期: 2018-11-28
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