| 胶结结构性土统一硬化模型 |
| |
| 引用本文： | 祝恩阳,李晓强.胶结结构性土统一硬化模型[J].岩土力学,2018,39(1):112-122. |
| |
| 作者姓名： | 祝恩阳 李晓强 |
| |
| 作者单位： | 1. 北京航空航天大学 航空科学与工程学院，北京 100191；2. 北方工业大学 土木工程学院，北京 100144 |
| |
| 摘 要： | 结构性土颗粒间的胶结使试样剪切破坏最终应力比高于相应重塑土，也限制了试样剪切时体积应变的自由发挥。在考虑结构垮塌为主的结构性土统一硬化(UH)模型基础上，将应力空间中静止的临界状态线扩展为动态的移动临界状态线。据此，通过建立新的屈服面方程并修正剪胀方程，将结构性土统一硬化(UH)模型扩展为胶结结构性土统一硬化(UH)模型。相对于原模型，新模型增加了1个模型参数，即初始胶结应力，反映土颗粒之间的初始胶结作用。通过4种结构性土试验数据与模型预测对照表明：所提模型能够较合理地描述结构性土等向压缩、常规三轴排水与不排水剪切等特性。
|
| 关 键 词： | 结构性土 胶结 移动临界状态线 本构模型 统一硬化模型 |
| 收稿时间： | 2017-03-19 |
A unified hardening model considering bonding in structured soils |
| |
| ZHU En-yang,LI Xiao-qiang.A unified hardening model considering bonding in structured soils[J].Rock and Soil Mechanics,2018,39(1):112-122. |
| |
| Authors: | ZHU En-yang LI Xiao-qiang |
| |
| Institution: | 1. School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China; 2. School of Civil Engineering, North China University of Technology, Beijing 100144, China |
| |
| Abstract: | Structured soils with interparticle bonding have higher shearing ultimate stress ratio and less free dilatancy than the corresponding reconstituted soils. To overcome this defect, a moving critical state line (MCSL) in stress space is presented based on the structured unified hardening (UH) model mainly considering soil structure collapse. By developing new yield functions and modifying dilatancy equation, the structured UH model is extended to be applicable for bonding structured soil. In stress space, MCSL parallels to the traditional static critical state line (CSL) and moves toward the CSL as structure decays. The extended model adds 1 new parameter, namely the initial bonding stress, to describe initial bond between particles. Comparisons between test data and predictions of 4 structured soils indicate that the extended model is qualified in describing the behaviors of the bonding structured soils in isotropic compression, drained and undrained triaxial compression. |
| |
| Keywords: | structured soil bonding moving critical state line constitutive model unified hardening (UH) model |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
