黄土平面蠕变模型

摘要

In geotechnical engineering,agricultural engineering and hydraulic and hydro-Power Engineering etc.,many problems such as long-term stability of dam and slope,could be regarded as the plane strain issue.Hence,these questions are always figured out though as the plane creep tests,which are more suitable to the engineering conditions.In order to deeply investigate the plane creep properties of loess soil,a series of laboratory consolidated plane creep tests of loess are conducted by a reformed plane creepmeter in this paper,and the tests results show that the deformation of plane creep is dramatic under high water content,high deviatoric stress and low consolidation condition.Base on the analysis of experimental data,a new empirical model is proposed.In addition,it is found that the two existed models named Singh-Mitchell and Mesri models,which are usually utilized to model the creep problems of soils,are not suitable for loess in the plane strain condition.However,the model proposed in this paper can better describe the creep proprieties of loess in the plane strain condition,due to its merits in both higher accuracy and fewer parameters.%在岩土工程中,有许多问题可归纳为平面应变问题,对其长期稳定性的研究采用平面蠕变试验更符合实际情况.采用改造的平面蠕变仪进行了一系列室内固结蠕变试验,发现:在大剪应力、高含水率以及低固结压力条件下黄土平面蠕变量较大;基于试验数据分析,建立了一种适合于黄土平面蠕变的模型公式.与Singh-Mitchell和Mesri模型的对比表明:该模型具有精度高、参数少且易获得等优点,能较好地模拟黄土平面应变状态下的蠕变特性.