基于蠕变试验及Burgers模型参数分析的三趾马红土长期强度确定  

Long-term Strength Determination of Hipparion Red Clay Based on Creep Test and Paremeter Analysis of Burgers Model

作　　者：付昱凯[1] 张子然 FU Yu-kai;ZHANG Zi-ran(School of Geological Engineering and Surveying,Chang’an University,Xi’an 710054,China)

机构地区：[1]长安大学地质工程与测绘学院,西安710054

出　　处：《科学技术与工程》2020年第2期735-740,共6页Science Technology and Engineering

基　　金：国家自然科学基金重大项目(41790442);陕西省自然科学基础研究计划(2014JQ5186)。

摘　　要：为了确定重塑三趾马红土的长期强度,首先利用改进的直剪蠕变仪,对甘肃陇东地区三趾马红土进行了剪切蠕变试验,得到了三组固结压力下蠕变曲线。在对各级固结压力蠕变曲线的Burgers模型拟合参数分析的基础上,提出了利用Burgers模型参数中的Maxwell体的黏滞系数与相应的剪应力加载等级之间曲线的最大曲率点确定三趾马红土的长期强度的方法,得到了三趾马红土的长期强度。通过与过渡蠕变法及等时曲线法确定的长期强度值对比,表明基于Burgers拟合参数分析的三趾马红土的长期强度确定方法较为合理。提出的长期强度确定方法及试验结果可对黄土地区受三趾马红土层控制的滑坡的稳定性评价及工程防治提供参考。In order to determine long-term strength of hipparion red clay in east Gansu Province,the direct shearing creep tests staged shear loading were carried out by using the improved direct shear apparatus and the direct shearing curves under three vertical consolidation pressures were obtained from the tests result.Based on the fitting parameters analysis of Burgers creep model curves,a new method of long-term strength determination for hipparion red clay was presented using the maximum curvature point of the relation curve between the viscosity coefficient of Maxwell component and shear loading.The proposed method of long-term strength determination was validated through the comparison with the values of long-term strength determinated by the methods of transition creep and isocharonous curve.The proposed method of long-term strength determination and the test results can be benefit to stability evaluation and treatment for landslides controlled by hipparion red clay in loess plateau.

关 键 词：三趾马红土 直剪蠕变试验 BURGERS模型 黏滞系数 长期强度 

分 类 号：TU446[建筑科学—岩土工程]