岩土工程学报2025，Vol.47Issue(12)：2456-2467,12.DOI:10.11779/CJGE20240845
考虑孔径和物化特性的胶结型能源黏土离散元模拟方法
Discrete element simulation method for clayey grain-cementing type methane hydrate bearing sediment considering pore size and physicochemical properties
摘要
Abstract
Methane hydrate(MH)is an important clean energy resource,widely distributed in clayey type methane hydrate bearing sediment(MHBS)in the South China Sea.The mechanical behavior of clayey type MHBS is affected by many factors,such as temperature fields,back pressure fields,chemical fields,pore size,MH saturation,physicochemical properties of clay,which is significantly different from that of sandy type MHBS.Therefore,the development of numerical analysis methods reflecting the mechanical response of clayey type MHBS under complex loading paths is crucial for the safe exploitation of MH.This work establishes a semi-theoretical equation of strength and stiffness of MH considering pore size and physicochemical properties by introducing the potential of water,and then this equation is introduced into the existing contact model of structural clay.The algorithm of the pore size is developed by the initial fabric parameters associated with the contact model,and the isotropic compression tests,the conventional triaxial tests and the true triaxial tests are conducted,and the effect of MH saturation,temperature and physicochemical characteristics(represented by water content)on mechanical behavior of clayey type MHBS are analyzed.The results show that the simulation results are consistent with those of experiments.Higher MH saturation and water content,as well as lower temperatures increase the yield strength and peak strength of clayey type MHBS,and higher MH saturation will significantly enhance shear dilation of clayey type MHBS.The true triaxial tests show that the hardening rule and the critical state strength are closely related to the principal stress coefficient.关键词
胶结型能源黏土/离散元模拟/力学行为Key words
clayey grain-cementing type methane hydrate bearing sediment/distinct element method/mechanical behavior分类
建筑与水利引用本文复制引用
张旭东,蒋明镜..考虑孔径和物化特性的胶结型能源黏土离散元模拟方法[J].岩土工程学报,2025,47(12):2456-2467,12.基金项目
国家自然科学基金重点项目(52331010) （52331010）
国家自然科学基金重大项目课题(51890911)This work was supported by Key Program of National Natural Science Foundation of China(Grant No.52331010),and Major Program of National Natural Science Foundation of China(Grant No.51890911). （51890911）
