摘要
为深入研究膨胀土的蠕变特性,首先采用分级加载对南阳膨胀土试样进行室内固结不排水三轴蠕变试验,获得不同偏应力作用下的蠕变全过程曲线,然后采用陈氏加载法将分级加载曲线转化为分别加载曲线,在Burgers模型的基础上对部分偏应力的蠕变试验结果进行拟合,由此建立适用于硅微粉-生石灰改良膨胀土的蠕变模型,最后采用所建模型对未参与拟合的蠕变试验结果进行预测。结果表明:硅微粉-生石灰复合改良方法能够明显减少膨胀土的变形,且所建模型对试验结果及模型参数的拟合优度均大于0.9。这说明,该模型能够较好地预测硅微粉-生石灰改良膨胀土的蠕变曲线,为实际工程应用提供依据。
In order to study the creep properties of expansive soil,graded loading of Nanyang expansive soil specimens were tested for indoor consolidation undrained triaxial creep,obtaining the whole process of creep curve under different bias stress,then the“Chen′s loading method”was used to convert the graded loading curve into respectively loading curve,on the basis of the Burgers model,the results of the creep test results of partial bias stress were fitted,thus establishing a suitable for silica-flour slope or foundation long-term stability.Based on the Burgers model,the creep test results of partial bias stress were fitted to establish a creep model applicable to silica micropowder-quicklime modified expansive soil,and finally the model was used to predict the creep test results that were not involved in the fitting.The results show that the composite improvement of silica micropowder-quicklime can obviously reduce the deformation of expansive soil,and the goodness of fit of the proposed model to the test results and the model parameters is more than 0.9,which indicates that the model can better predict the creep curve of silica micropowder-quicklime modified expansive soil,and it can provide the basis for the application of the actual engineering.
作者
王一鹏
肖桂元
魏海龙
石岩松
王一名
李奕康
WANG Yipeng;XIAO Guiyuan;WEI Hailong;SHI Yansong;WANG Yiming;LI Yikang(School of Civil Engineering,Guilin University of Technology,Guilin 541004,China;School of Civil Engineering,Hebei University of Engineering,Handan 056038,China)
出处
《河南工程学院学报(自然科学版)》
2025年第1期26-31,共6页
Journal of Henan University of Engineering:Natural Science Edition
基金
国家自然科学基金项目(52169022)。
关键词
膨胀土
硅微粉
生石灰
蠕变模型
蠕变特性
expansive soil
silica micropowder
quicklime
creep model
creep properties
作者简介
王一鹏(2000-),男,硕士研究生,主要研究方向为特殊土成灾机制及地下工程防灾。
