关中咸阳地区Q_2黄土蠕变特性试验研究  

Study on Creep Characteristics of Q_2 Loess of Xianyang Area in the Guanzhong Basin

作　　者：唐皓[1] 党琪[2] 段钊[2] 赵法锁[1,3] 宋飞[1,3] 

机构地区：[1]长安大学地质工程与测绘学院,西安710054 [2]西安科技大学地质与环境学院,西安710054 [3]长安大学地质工程研究所,西安710054

出　　处：《防灾减灾工程学报》2014年第6期758-763,770,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(40872185);长安大学中央高校基本科研业务费专项(CHD2010JC118)资助

摘　　要：通过对关中咸阳地区Q2黄土进行三轴蠕变试验,得到了关中咸阳地区Q2黄土不同围压及不同含水率下的应变—时间曲线和应力—应变等时曲线。分析试验曲线表明:围压及含水率对关中咸阳地区Q2黄土的蠕变特性具有较大影响,表现在其蠕变变形量与含水率在相同围压时呈正相关关系,与围压在相同含水率时呈负相关关系。再进一步对关中咸阳地区Q2黄土蠕变破坏应力与围压及含水率试验数据做拟合分析,得到了其蠕变破坏应力与围压呈线性正相关关系,与含水率呈负对数关系的变化规律。在以上分析的基础上,通过改进常用的五元件模型(H-K-K)参数性质及结构,得到了可描述Q2黄土加速蠕变的七元件非线性蠕变模型,并应用试验数据对其进行拟合辨识,最终得到较为理想的结果。In the process of the triaxial creep test of Q2 loess in Xianyang region of the center Shaanxi plain,the strain-time curves and the isochronous stress-strain curves in various confining pressure and moisture content could be got.By analyzing the trial curves of the confining pressure and moisture content versus creep property of this loess,apositive correlation between deformation of creep and moisture content is established,while a negative correlation between the deformation of creep and confining pressure is found.Further more,in fitting analysis,the soil creep failure stress increases in line with the confining pressure but decreases logarithmically along the moisture content.According to aforementioned analysis,ameliorating the parameter property and structure of common 5-component model,a 7-component nonlinear creep model could be employed,describing the accelerating creeping of Q2 loess capably.Finally,an acceptable optimum could be obtained by applying this fitting identity to test data.

关 键 词：Q2黄土 蠕变试验 蠕变特性 七元件非线性蠕变模型 

分 类 号：TU432[建筑科学—岩土工程]