2025年7月28日 星期一
岩石力学与工程学报  2023, Vol. 42 Issue (10): 2588-2600    DOI: 10.13722/j.cnki.jrme.2022.1160
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饱和黏土一维非线性固结与热传导耦合模型
江文豪1,2,3,冯  晨1,2,3,李江山1,3
(1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉  430071;2. 中国科学院大学,北京  100049;
3. 中国科学院武汉岩土力学研究所 污染泥土科学与工程湖北省重点实验室,湖北 武汉  430071)
Coupled model for one-dimensional nonlinear consolidation and#br# heat conduction in saturated clay
JIANG Wenhao1,2,3,FENG Chen1,2,3,LI Jiangshan1,3
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Science,Wuhan,Hubei 430071,China;2. University of Chinese Academy of Sciences,Beijing 100049,China;3. Hubei Province Key Laboratory of Contaminated Sludge and Soil Science and Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Science,Wuhan,Hubei 430071,China)
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摘要 为研究饱和黏土一维非线性固结与热传导耦合问题,在考虑温度变化对黏土物理力学性质影响基础上,推导得到非线性固结和热传导的控制方程,并建立相应耦合模型,该模型可考虑非线性固结过程与热传导过程的相互作用。随后,采用有限差分法对所建耦合模型进行求解,并通过与COMSOL软件和其他解析解计算结果对比,有效验证了模型的合理性。基于所建耦合模型,利用某一算例分析温度增量ΔT、先期固结压力pcR和线性加荷时间ta对固结行为影响。结果发现,温度变化会对非线性固结过程产生多方面影响,ΔT的增大整体上加快了超孔压的消散速率,也增大了沉降速率和最终沉降量;饱和黏土中超孔压的消散速率会随pcR的增大而加快,但沉降量会随pcR的增大而减小;ta的增大会降低饱和黏土中产生的最大超孔压值,也会减慢固结速率。此外,在固结过程中,以沉降定义的固结度Us小于以孔压定义的固结度Up。
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关键词 土力学饱和黏土非线性固结热传导耦合模型有限差分法固结行为    
Abstract:To investigate the coupled problem of one-dimensional nonlinear consolidation and heat conduction in saturated clay,the governing equations for nonlinear consolidation and heat conduction are derived considering the effects of temperature change on the physical and mechanical properties of clay,and a corresponding coupled model is established. This model can consider the interaction between nonlinear consolidation process and heat conduction process. Later,the finite difference method is adopted to solve the proposed coupled model,and the rationality of the model is effectively verified by comparing it with the calculation results of COMSOL software and other analytical solutions. Based on the presented coupled model,an example is used to analyze the influences of temperature increment ΔT,pre-consolidation pressure pcR and linear loading time ta on the consolidation behaviors. The results show that the temperature change has comprehensive effects on the nonlinear consolidation process,the increase of ΔT generally accelerates the dissipation rate of excess pore-water pressure,and also increases the settlement rate and final settlement. The dissipation rate of excess pore-water pressure in saturated clay increases with an increasing pcR,while the settlement decreases with an increasing pcR. The increase of ta reduces the maximum excess pore-water pressure generated in saturated clay,and also slows down the consolidation rate. In addition,it is observed that the consolidation degree Us defined by settlement is less than the consolidation degree Up defined by pore pressure during the consolidation process.
Key wordssoil mechanics    saturated clay    nonlinear consolidation    heat conduction    coupled model    finite difference method    consolidation behavior
    
引用本文:   
江文豪1,2,3,冯 晨1,2,3,李江山1,3. 饱和黏土一维非线性固结与热传导耦合模型[J]. 岩石力学与工程学报, 2023, 42(10): 2588-2600.
JIANG Wenhao1,2,3,FENG Chen1,2,3,LI Jiangshan1,3. Coupled model for one-dimensional nonlinear consolidation and#br# heat conduction in saturated clay. , 2023, 42(10): 2588-2600.
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