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水化-冻融耦合条件下大理岩蠕变损伤本构模型

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为描述岩石在水化-冻融耦合条件下的蠕变特性,以大理岩为试验对象,分别开展酸性、碱性、中性溶液与不同冻融循环条件下的单轴压缩蠕变及核磁共振试验,分析T2(弛豫时间)谱分布和蠕变试验结果,并进行耦合损伤演化,得到一个新的考虑水化-冻融与应力耦合的蠕变损伤本构模型.结果表明:1)大理岩T 2谱表现为三个谱峰,岩石以大孔径孔隙为主.2)冻融循环作用促进大理岩孔隙发育,不同溶液环境对孔隙发育影响从大到小的关系为酸性、碱性、中性.3)分别构建水化-冻融和受荷损伤变量,从而建立耦合损伤变量.基于大理岩蠕变特性,确定蠕变基础模型,进行耦合损伤演化,得到新的水化-冻融耦合条件下的大理岩蠕变损伤本构模型.4)新建模型模拟大理岩三种溶液冻融循环50次的的平均R2达0.985 4,远高于基础模型平均R2(0.919 4),说明本文新建模型对三种岩石蠕变数据辨识效果更好.
Creep Damage Constitutive Model of Marble Under Hydration Freeze-Thaw Coupling
To describe the creep characteristics of rocks under hydration freeze-thaw coupling conditions,uniaxial compression creep and nuclear magnetic resonance tests were conducted on marble under acidic,alkaline,neutral solutions and different freeze-thaw cycle conditions.T2 spectrum distribution and creep test results were analyzed,and coupled damage evolution was carried out.Finally,a new creep damage constitutive model considering the coupling of hydration freeze-thaw and stress was obtained.The results show that:1)The T2 spectrum of marble exhibits three peaks,and pore in the rock is mainly composed of large size pores.2)The freeze-thaw cycle promotes the development of pores in marble,and the influence degree of different solution environments on pore development from high to lower is acidic,alkaline,and neutral.3)The hydration freeze-thaw and load damage variables were constructed to establish a new creep damage constitutive model of marble under the coupling conditions of hydration freeze-thaw.4)The average R2of 50 freeze-thaw cycles of three different solutions of marble simulated by a new model is 0.985 4,while the average R of the basic model is only 0.919 4.

hydration freezing-thawmarblenuclear magnetic resonancecreepinjuryconstitutive model

赵越、司运航、张译丹、赵京禹

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辽宁工程技术大学矿业学院,辽宁 阜新 123000

辽宁工程技术大学创新实践学院,辽宁 阜新 123000

辽宁省化工地质勘查院有限责任公司,辽宁 锦州 121000

水化-冻融 大理岩 核磁共振 蠕变 损伤 本构模型

国家自然科学基金项目中国科协青年托举工程项目2023年度辽宁省教育厅基本科研项目(青年项目)辽宁省经济社会发展研究课题辽宁省经济社会发展研究课题

517741652023QNRC001JYTQN20232122024lslqnrckt-0172024lslybwzzkt-002

2024

10.13278/j.cnki.jjuese.20230153

吉林大学学报(地球科学版)
吉林大学

吉林大学学报(地球科学版)

CSTPCD北大核心
影响因子：1.062
ISSN：1671-5888
年,卷(期)：2024.54(1)
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