深海能源土剪切带形成机理离散元分析

发布时间：2018-03-02 13:39

本文选题：深海能源土　切入点：天然气水合物　出处：《岩土工程学报》2014年09期 　论文类型：期刊论文

【摘要】：天然气水合物的分解开采过程将会劣化深海能源土的力学性能,从而引发一系列岩土工程问题。因此,要实现天然气水合物的安全开采,需要对能源土的强度和变形特性开展研究。结合深海能源土微观胶结模型,通过平面应变双轴试验的离散元模拟,研究了深海能源土剪切带形成机理以及剪切带内外的宏微观变量特征。结果表明:水合物胶结提升了深海能源土的强度,且使其呈现出明显的应变软化特性;剪切带在峰值应力后开始产生,伴随着胶结的大量破坏以及各宏微观变量的局部化;剪切带内外各宏微观变量差异明显,随着轴向应变的增加,土体微观结构也随之发生变化。
[Abstract]:The decomposition and exploitation of natural gas hydrate will degrade the mechanical properties of deep sea energy soil, which will lead to a series of geotechnical engineering problems. Therefore, to realize the safe exploitation of natural gas hydrate, It is necessary to study the strength and deformation characteristics of the energy soil. Combined with the microscopic cementing model of deep sea energy soil, the discrete element simulation of plane strain biaxial test is carried out. The formation mechanism of shear zone of deep sea energy soil and the characteristics of macro and micro variables inside and outside the shear zone are studied. The results show that hydrate cementation enhances the strength of deep sea energy soil and makes it show obvious strain softening characteristics. The shear band begins to produce after the peak stress, accompanied by a great deal of damage of the cementation and localization of the macro and micro variables, the macro and micro variables of the shear band are different obviously, and the microstructure of the soil changes with the increase of axial strain.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金国家杰出青年科学基金项目(51025932)
【分类号】：TU411

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