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。
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.
作者
袁庆盟
孔亮
刘锐明
林星宇
YUAN Qing-meng;KONG Liang;LIU Rui-ming;LIN Xing-yu(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;School of Science,Qingdao University of Technology,Qingdao 266033,China)
出处
《科学技术与工程》
北大核心
2018年第32期64-70,共7页
Science Technology and Engineering
基金
国家自然科学基金(11572165
51778311)资助
关键词
深海能源土
结构性屈服压力
统一硬化模型
统一硬化参数
剪胀性
gas hydrate bearing sediments
structural stress
unified hardening model
unified hardening parameters
dilatancy
