动载下饱和重塑黄土的骨干曲线变化研究  

Study of variation of backbone curve of saturated remolded loess under dynamic loading

作　　者：廖红建[1,2] 肖正华[2,3] 刘健 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]西安交通大学土木工程系,西安710049 [3]新疆大学建筑工程学院,乌鲁木齐830008 [4]里尔中央理工大学土木工程系,法国59651

出　　处：《岩土力学》2011年第2期375-379,共5页Rock and Soil Mechanics

基　　金：三峡库区地质灾害教育部重点实验室基金资助项目(No.2008KDZ09);国家自然科学基金资助项目(No.50979087)

摘　　要：针对饱和重塑黄土进行了一系列等向固结和偏压固结下的排水与不排水动三轴试验,分析了饱和重塑黄土的动力性质、骨干曲线模型及其影响因素。基于动三轴试验结果,探讨了在考虑累积塑性应变影响下,修正Hardin-Drnevich模型的适用性。结果表明,考虑累积塑性应变时,修正Hardin-Drnevich模型能够较好地模拟饱和重塑黄土的骨干曲线试验结果。进而分析了等向固结和偏压固结、固结围压、波形和排水条件等因素对饱和重塑黄土骨干曲线的影响,得到偏压固结和固结围压的增大使骨干曲线上移,土体强度增加,而波形对骨干曲线的影响较小;排水条件下的骨干曲线较不排水条件下的有所上移,土体强度增加。所得结论可供工程设计人员参考。A series of triaxial tests of saturated remolded loess under dynamic loading in isotropic and anisotropic consolidation stress states on condition of drain and undrain are performed to analyse its dynamic characteristics and backbone curves.Based on the dynamic triaxial test results,the effect of accumulated plastic strain is considered;and then the applicability of modified model of Hardin-Drnevich to saturated remolded loess is discussed.The results show that the modified model of Hardin-Drnevich could simulate the backbone curve of saturated remolded loess well.After that,the influences of isotropic and anisotropic consolidation stress states,confining pressure of consolidation,wave form and drain or undrain on the backbone curve for saturated remolded loess are also discussed.The backbone curves are all upper shift under anisotropic consolidation with the increasing confining pressure of consolidation;and it is shown that the strength of samples is increased;the impact of wave form on backbone curve is little;the effect of drain condition on it is upper shift comparing with undrained condition and this indicates that the strength of samples is enhanced.The conclusions can be for referenced by engineering designers.

关 键 词：黄土 骨干曲线 修正Hardin-Drnevich模型 动弹性模量试验 

分 类 号：TU435[建筑科学—岩土工程]