粗粒土与结构接触面往返剪切试验的PFC2D数值模拟
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摘要
为研究土颗粒的细观,利用PFC2D对粗粒土与结构接触面往返剪切试验进行数值模拟,研究接触面的剪胀特性与颗粒平移、旋转、破碎的关系及体应变可逆性和不可逆性规律.当不考虑颗粒破碎时,土体具有可逆性剪胀体应变;当考虑颗粒破碎时,土体具有不可逆性剪胀体应变.验证接触面体应变是由一个可逆性体应变分量与一个不可逆性体应变分量构成的.PFC2D位移场试验及类长形颗粒定向试验表明可逆性体应变主要由颗粒平移和颗粒自身旋转产生.对考虑颗粒破碎现象的黏结模型分析表明,不可逆性体应变主要由压密和破碎两种物态演化现象产生,颗粒破碎起主要作用.
In order to study the micro-scale of soil particles,the cyclic shear test of the graval-structure interface is simulated by PFC2 D. The relationships between the dilatancy of the interface and the particle translation,rotation,breakage,and the rules of reversible and irreversible volume strain are studied. The soil has the volume strain of reversible dilatancy without considering particle breakage and the soil has the volume strain of irreversible dilatancy with considering particle breakage,which verifies that the volume strain of the interface is composed of a reversible volume strain component and an irreversible volume strain component. The PFC2 D displacement field test and the elongated particle orientation test indicate that the reversible volume strain is mainly produced by particle translation and rotation. The analysis on the binding model considering particle breakage shows that the irreversible volume strain is mainly produced by the evolution from particle compaction to particle breakage,where the particle breakage plays a main role.
In order to study the micro-scale of soil particles,the cyclic shear test of the graval-structure interface is simulated by PFC2 D. The relationships between the dilatancy of the interface and the particle translation,rotation,breakage,and the rules of reversible and irreversible volume strain are studied. The soil has the volume strain of reversible dilatancy without considering particle breakage and the soil has the volume strain of irreversible dilatancy with considering particle breakage,which verifies that the volume strain of the interface is composed of a reversible volume strain component and an irreversible volume strain component. The PFC2 D displacement field test and the elongated particle orientation test indicate that the reversible volume strain is mainly produced by particle translation and rotation. The analysis on the binding model considering particle breakage shows that the irreversible volume strain is mainly produced by the evolution from particle compaction to particle breakage,where the particle breakage plays a main role.
引文
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[2]CLOUGH G W,DUNCAN J M.Finite element analysis of retaining wall behavior[J].J Soil Mech&Foundations Division ASCE,1971,97(12):1657-1672.
[3]DESAI C S,RIGBY D B.Cyclic interface and joint shear device including pore pressure effects[J].J Geotechnical&Geo-environmental Eng ASCE,1997,123(6):568-579.
[4]池永.土的工程力学性质的细观研究——应力应变关系剪切带的颗粒[D].上海:同济大学,2002.
[5]王成华,占川.土与结构界面力学特性研究综述[J].建筑技术,2013,44(6):486-490.
[6]尚守平,鲁华伟,邹新平,等.土-结构动力相互作用结构自振周期的研究[J].地震工程与工程振动,2013,33(2):117-125.
[7]张嘎,张建明.粗粒土与结构接触面的可逆性与不可逆性剪胀规律[J].岩土力学,2005,26(5):699-704.
[8]周健,史旦达,贾敏才,等.砂土单调剪切力学性状的颗粒流模拟[J].同济大学学报:自然科学版,2007,35(10):1299-1304.
[9]刘文白,周健.上拔荷载作用下扩展基础的颗粒流数值模拟[J].水利学报,2004,35(12):1-10.
[10]杜强,刘文白.土与结构物半模直剪试验的颗粒流数值模拟[J].水运工程,2012(8):160-165.
[11]胡黎明,马杰,张丙印.散粒体间接触面单剪试验及数值模拟[J].岩土力学,2008,29(9):2319-2322.
[12]蒋明镜,李秀梅.双轴压缩试验中砂土剪切带形成的离散元模拟分析[J].山东大学学报:工学版,2012(2):55-61.
[13]张翀,舒赣平.颗粒形状对颗粒流模拟双轴压缩试验的影响研究[J].岩土工程学报,2009,31(8):1281-1286.
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