A creep constitutive model incorporating deformation mechanisms for crushable calcareous sand
A creep constitutive model incorporating deformation mechanisms for crushable calcareous sand
复制标题
考虑可破碎钙质砂变形机制的蠕变本构模型
DOI：
10.1007/s12517-018-3982-8
复制
发表时间：
2018-10
影响因子：
--
通讯作者：
Fan Pengxian
中科院分区：
文献类型：
--
作者：
Wang Yasong;Ma Linjian;Wang Mingyang;Lv Yaru;Dong Lu;Fan Pengxian
由于钙质砂颗粒内部空隙明显、形状不规则，导致其压缩性高、抗压强度低，其蠕变响应远大于硅砂。与石英砂不同，钙质砂在一般应力下的蠕变行为可分为初始近线性阶段、阻尼阶段和稳定阶段。一般的蠕变模型，如Burgers粘弹性模型，很难很好地描述三相蠕变行为。通过两组钙质砂在一般应力状态下的三轴蠕变试验，发现钙质砂的三相蠕变主要由颗粒重排、颗粒间摩擦和颗粒破碎三种机制控制。与硅砂相比，钙质颗粒上孔洞附近的局部不稳定性导致特定的初始近线性相和阻尼相。在此基础上，建立了一个新的蠕变本构模型，该模型采用不同的流变组分，从理论上描述了钙质砂的蠕变特性。利用试验数据对本构模型进行了验证，结果表明本构模型能够合理地描述钙质砂的蠕变特性。
Due to the high compressibility and low crushing strength induced by remarkable intra-granular void and highly irregular shape, the creep response of calcareous sand is far larger than that of silica sand. Unlike silica sand, the creep behavior of calcareous sand under general stress might be divided into the initial near-linear phase, damping phase, and the steady phase. The three-phase creep behavior is difficult to be well described by general creep models, such as Burgers viscoelastic model. This paper conducted two sets of triaxial creep tests of calcareous sand under general stress state, finding that the three-phase creep is mainly governed by the mechanisms of grain rearrangement, interparticle friction, and particle crushing, respectively. Local instability near cavities on calcareous particles leads to specific initial near-linear phase and damping phase compared to silica sand. Further, a new creep constitutive model was established using different rheological components to theoretically describe the creep characteristics of calcareous sand. The constitutive model was validated and proved to describe creep behavior of calcareous sand reasonably with the test data.
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DOI：
10.1061/(asce)0733-9410(1991)117:9(1288
发表时间：
1991-09
期刊：
Journal of Geotechnical Engineering
影响因子：
--
作者：
J. Schmertmann
通讯作者：
J. Schmertmann
影响因子：
5.8
作者：
G. McDowell
通讯作者：
G. McDowell
DOI：
10.1061/(asce)gt.1943-5606.0000696
发表时间：
2012-01
影响因子：
3.9
作者：
A. Sanzeni;A. Whittle;J. Germaine;F. Colleselli
通讯作者：
A. Sanzeni;A. Whittle;J. Germaine;F. Colleselli
影响因子：
1.6
作者：
J. Yamamuro;P. Lade
通讯作者：
J. Yamamuro;P. Lade
影响因子：
5.3
作者：
P. Lade;J. Yamamuro;Paul A. Bopp
通讯作者：
P. Lade;J. Yamamuro;Paul A. Bopp