摘要
压气蓄能盐穴的围岩在运行期内承受蠕变和疲劳同时作用,为确保压气蓄能盐穴在运行期间的安全性,研究盐岩在蠕变和疲劳同时作用下的力学响应至关重要,建立考虑循环加卸载效应的蠕变本构模型可更准确地预测压气蓄能盐穴长期稳定性。首先,建立了一个疲劳损伤体以描述循环载荷对盐岩蠕变特性的影响,随后将弹性体、Kelvin体、疲劳损伤体和非线性黏塑性体串联,提出了一种新的蠕变疲劳本构模型,并用试验数据进行了验证,结果显示模型与试验数据吻合较好。随后,推导了模型的有限差分形式,将模型在FLAC^(3D)软件中进行了二次开发,进行了单轴蠕变模拟试验。模拟得到的轴向应变与试验数据呈现出类似的变化趋势。最后,针对我国某压气蓄能盐穴,建立了一个三维地质力学模型,基于提出的蠕变疲劳模型分析了该盐穴在长期运行过程中的变形,进一步比较了蠕变疲劳模型与静态Norton Power模型之间的模拟结果差异。
The surrounding rock of a compressed air energy storage(CAES)salt cavern experiences both creep and fatigue during operation.Ensuring the safety of the CAES salt cavern requires studying the mechanical response of salt rock under the combined effect of creep and fatigue.Developing a creep constitutive model that considers cyclic loading and unloading can more accurately predict the long-term stability of the cavern.This paper introduces a fatigue damage body to describe the impact of cyclic loading on the creep characteristics of salt rock.It then integrates this component with an elastic body,Kelvin body,and nonlinear visco-plastic body to propose a new creep-fatigue constitutive model.The model is validated with experimental data,showing good agreement between model predictions and experimental data.The finite difference form of the model is derived and implemented in FLAC^(3D) software for a uniaxial creep simulation experiment.The simulation results for axial strain closely match the experimental data.Finally,a three-dimensional geomechanical model of a domestic CAES salt cavern is established using the proposed creep-fatigue model.The deformation of the salt cavern during long-term operation is analyzed and compared with results from the static Norton Power model,highlighting the differences and improvements provided by the new model.
作者
赵凯
马洪岭
施锡林
李银平
杨春和
ZHAO Kai;MA Hong-ling;SHI Xi-lin;LI Yin-ping;YANG Chun-he(State Key Laboratory of Geomechanics and Geotechnical Engineering Safety,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Hubei Key Laboratory of Geo-environmental Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China)
出处
《岩土力学》
北大核心
2025年第S1期1-12,共12页
Rock and Soil Mechanics
基金
湖北省重点研发计划(No.2022BAA093,No.2022BAD163)
江西省重大科技研发专项(No.2023ACG01004)
岩土力学与工程安全全国重点实验室开放基金课题(No.SKLGME023008)
关键词
蠕变疲劳
盐岩
本构模型
压缩空气储能
二次开发
creep-fatigue
salt rock
constitutive model
compressed air energy storage(CAES)
secondary development
