| 刘恩龙,沈珠江.结构性土的二元介质模型[J].水利学报,2005,36(4):0391-0395 |
| 结构性土的二元介质模型 |
| Binary medium model for structured soils |
| |
| DOI： |
| 中文关键词: 破损力学 结构性土 二元介质模型 结构参数 |
| 英文关键词: breakage mechanics structured soils binary medium model structural parameters |
| 基金项目: |
|
| 摘要点击次数: 3223 |
| 全文下载次数: 183 |
| 中文摘要: |
| 本文在岩土破损力学的理论框架内，认为弹脆性元在破损以前的变形特性可以用理想的弹性材料描述，弹脆性元破损后转化成的弹塑性元的变形和破坏特性可以用修正的剑桥模型来描述，通过引入反映破损过程的结构参数(破损参数和应力比)，建立了结构性土的二元介质模型。最后与人工制备结构性黏土的等向压缩试验和原状海积软土的三轴排水剪切试验进行对比，表明所建立的模型可以较好的描述结构性土的变形特性。 |
| 英文摘要: |
| A new model, referred to as the binary medium model for structured soils, is for mulated under the theoretical framework of breakage mechanics for geomaterials. In the model, structured soils are conceptualized as binary medium consisting of bonded blocks and weakened bands which are idealized as elastic-brittle elements and elastic-plastic elements respectively. During the loading process, the elastic-brittle element gradually fractured and transformed into elastic-plastic element. The failure and deformation behaviors of the elastic-brittle element are described by ideal elastic-brittle material, and that of the elastic-plastic element are described by modified Cam clay model. Two sets of structural parameters, i.e. breakage parameters and stress ratios, describing the influence of soil structure on the failure are introduced. The proposed model is used to predict the behaviors of artificial structured soils in isotropic compression test and disturbed soft soils in triaxial drained shear test. The comparison between prediction and experimental data demonstrates that the new model can satisfactorily simulate many important behaviors of structured soils. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |