高饱和度含气土动力问题的有限体积法分步解法  

Staggered finite volume solutions for dynamic problems in highly saturated gassy soils

作　　者：邹诗环 黄茂松[1,2] 时振昊 ZOU Shi-huan;HUANG Mao-song;SHI Zhen-hao(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩土力学》2025年第4期1286-1293,共8页Rock and Soil Mechanics

基　　金：国家重点研发计划(No.2021YFB2600700)。

摘　　要：我国东南沿海海域广泛分布含封闭小气泡的海洋软土,小气泡的存在将对其压缩性产生很大影响。有限体积法有助于建立与流体模拟一致的海床动力响应计算方法,进而实现波浪-海床相互作用的模拟。矢量分解方法能显著提高分步解法的稳定时间步长,且该解法易于在开源有限体积法平台OpenFOAM上实现,故其具有高效与通用的特点。算例分析表明:所提出的分步求解算法能合理反映高饱和度含气土的动力响应;小气泡的存在将极大降低高饱和度含气土的瞬时孔压响应与孔压幅值,且考虑重力作用时,饱和度的下降会导致动孔压相位滞后。Soft marine soils in southeastern coastal areas of China are widely distributed,with occluded gas bubbles that significantly impact soil compressibility.Finite volume(FV)method helps to develop consistent computation method of seabed dynamic response with fluid simulation,and then wave-seabed interaction can be simulated.Operator splitting technique can significantly enlarge time steps for stability of staggered algorithms,and such algorithms can easily be implemented on open-source FV calculation platform,OpenFOAM,thus they are efficient and versatile.Numerical cases indicate that the proposed staggered algorithm can reasonably reflect dynamic responses of highly saturated gassy soil.The existence of occluded bubbles can hugely lower transient responses and amplitudes of pore pressure of highly saturated gassy soil.Meanwhile,when considering gravity,decrease of saturation degree can lead to phase lag of dynamic pore pressure.

关 键 词：高饱和度含气土 矢量分解方法 分步解法 有限体积法 OPENFOAM 

分 类 号：TU447[建筑科学—岩土工程]