炭质泥岩路堤动力湿化变形及损伤失稳机理研究

项目名称： 炭质泥岩路堤动力湿化变形及损伤失稳机理研究

项目编号： No.51508040

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 建筑科学

项目作者： 曾铃

作者单位： 长沙理工大学

项目金额： 20万元

中文摘要： 在炭质泥岩广泛分布地区，将其用于路堤填筑不可避免，但在车载动力及雨水渗入作用下极易造成填料的后续崩解及强度劣化。虽在填筑时采取了必要防范措施，但目前对炭质泥岩填料的动力湿化变形及劣化机理尚缺乏研究，导致炭质泥岩路堤失稳现象时有发生。.本项目针对该问题，开展了以下工作：首先依据路堤填筑指标设计路堤模型试验来对炭质泥岩路堤在动力-湿化影响下的变形及水分迁移特征进行分析；其次将无损检测技术与三轴试验结合，引入CT损伤概念，开展动力湿化条件下的强度劣化机理及动力-湿化损伤模型的研究。同时，基于Hoek-Brown准则，推导能考虑损伤特征的Mohr-Coulomb强度等效间接解法，建立能考虑动力及湿化损伤的炭质泥岩强度计算方法，设计合理的炭质泥岩路堤稳定性计算流程。最后，建立路堤稳定性评价体系，提出动力-湿化条件下的路堤失稳机理。研究成果对完善我国耐久性路堤建造技术具有重大的经济和社会效益。

中文关键词： 公路工程；炭质泥岩；湿化变形；劣化特征；计算方法

英文摘要： The regions of carbonaceous mudstone widely distributed , use it for embankment filling is unavoidable, vehicle dynamics and rain infiltration will cause subsequent collapse and strength degradation of embankment filling materials. although targeted prevention measures were taken during fill of embankment, the research of dynamics- wetting deformation and degradation mechanism still lack, which causes the unstability of the carbonaceous mudstone embankment is often happened. .The project is aimed at this problem to carry out the following work: firstly, based on the filling index design model of carbonaceous mudstone embankment to analyzes the moisture migration and deformation characteristics under the influence of dynamics- wetting conditions.; Secondly, combined with nondestructive testing technology and triaxial test, based on CT damage concept,carry out the research of Strength degradation mechanism and dynamics-weting damage constitutive model of carbonaceous mudstone under dynamics-weting conditions. At the some，Based on Hoek-Brown criterion, the Mohr-Coulomb strength indirect solution is derived which damage characteristics can be considered. Establish carbonaceous mudstone strength calculation method which dynamics-weting damage can be considered, design of carbonaceous mudstone embankment stability calculation process; Finally, establish embankment stability evaluation system, put forword embankment stability control method under dynamics-weting conditions. The results of the project are helpful to improve the construction technology of the durable subgrade and prolong the service life of the subgrade.

英文关键词： Highway Engineering;Carbonaceous mudstone;Wetting deformation;Damage characteristics;Calculation Method