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| 1 | 平面应变条件下砂土局部化剪切带的有限元模拟显示文摘根据饱和砂土的排水平面应变压缩试验的应变场,分析研究砂土的应变局部化现象以及剪切带的形成。在平面应变压缩条件下,砂土在峰值应力状态附近出现应变局部化现象,在残余状态最终形成一条V型剪切带。剪切带的形成是一个渐进过程,砂土呈现出渐进性破坏特性。这种由软化特性引起的应变局部化剪切带是砂土材料非常重要的变形和强度特性之一。基于砂土的三要素弹黏塑性本构模型和动态松弛有限元求解技术,对砂土的应变局部化现象和剪切带的形成进行有限元模拟。其中,砂土本构模型中引入应变局部化参数S来表示砂土峰值以后的软化和剪切带效果,剪切带在单元内未考虑其方向性,而是假设剪切带方向与最大剪切应变的方向一致。分析结果表明,动态松弛有限元法及砂土三要素模型能合理地模拟砂土的应变局部化现象,剪切带附近的最大剪应变值也非常接近,从而实现对砂土材料从硬化→峰值→软化→残余的全过程模拟以及对砂土应变局部化剪切带的定量化分析。 | 李福林 彭芳乐 雷亮 KONGKITKUL W | 2010 | 岩石力学与工程学报2010，29，4： | 13 |
| 2 | 砂土速率相关黏性特性的有限元分析显示文摘根据复杂加载条件下饱和砂土排水平面应变压缩试验,分析了砂土的速率相关的黏性特性.试验发现砂土存在显著的加载速率效应、蠕变变形和应力松弛,并且在应变速率突变、蠕变或应力松弛之后,以新的应变速率重新加载时呈现出高刚度行为.针对砂土的变形强度特性提出了一种非线性有限元计算方法,砂土本构关系采用了三要素弹黏塑性本构模型.将有限元计算结果与试验结果进行比较,表明建议的有限元计算方法不仅可以较为精确地模拟砂土的平均应力-应变关系,同时也可以模拟包含变应变速率加载、蠕变加载、应力松弛加载的全过程黏塑特性. | 李福林 彭芳乐 KONGKITKUL Warat 龙冈文夫 | 2011 | 同济大学学报(自然科学版)2011，39，1： | 2 |
| 3 | Viscous deformation of geosynthetic reinforcementunder cyclic loading conditions and its model simulation显示文摘 | KONGKITKUL W HIRAKAWA D TATSUOKA F | 2004 | Geosynthetics International2004，11，2： | 1 |
| 4 | Viscous behaviour of geogrids; experiment and simulation显示文摘 | KONGKITKUL W HIRAKAWA D TATSUOKA F | 2007 | Soils and Foundations2007，47，2： | 1 |
| 5 | Analytical and numerical modeling of pullout capacity and interaction between hexagonal wire mesh and silty sand backfill trader an in-soil pullout test显示文摘 | Teerawattanasuk C Bergado D T Kongkitkul W | 2003 | Canadian Geotechnical Journal2003，40，5： | 1 |
| 6 | Development of tunneling influence zones for adjacent pile foundations by numerical analyses显示文摘 | Pornkasem Jongpradist Theerapong Kaewsri Attasit Sawatparnich Suchatvee Suwansawat Sompote Youwai Warat Kongkitkul Jutha Sunitsakul | 2013 | Tunnelling and Underground Space Technology incorporating Trenchless Technology Research2013，，： | 1 |
| 7 | Viscous behaviour of unbound granular materials in direct shear显示文摘 | DUTTINE A TATSUOKA F KONGKITKUL W | 2008 | Soils and Foundations2008，48，3： | 1 |
| 8 | Strain rate effects on sand and its quantitative analysis显示文摘Strain rate effects on the stress—strain behavior of sand were investigated by performing special plane strain and triaxial compression tests on saturated and air-dried sand specimens. In these tests, the loading strain rate was changed many times by a factor of up to 1 000 during otherwise monotonous loading at a constant axial strain rate. Test results show that the stress jump upon a stepwise change in the strain rate decays with an increase in the irreversible strain when monotonous loading continues at the changed strain rate and the amount of stress jump is essentially proportional to the instantaneous stress. Based on the amount of these stress jumps, a parameter β called the rate-sensitivity coefficient is introduced to represent the quantity of the observed viscous properties of sand, which equals 0.021 3 and 0.024 2 respectively for Hostun and Toyoura sands. Further analyses on the results indicate that the effect of the presence of pore water is deemed to be negligible with sand and the β value is rather independent of loading method, wet condition and confining pressure. | 李福林 彭芳乐 李建中 KONGKITKUL W | 2009 | Journal of Central South University2009，16，4： | 0 |
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