文献类型：期刊文献

中文题名：碱污染红黏土抗剪强度及破裂面微观结构特征研究

英文题名：LABORATORY TESTS FOR SHEAR STRENGTH AND FRACTURE SURFACE MICROSTRUCTURE OF ALKALI CONTAMINATED RED CLAY

作者：陈筠 王麒 于明圆 邬忠虎 高彬 董吉

第一作者：陈筠

机构：[1]贵州理工学院,交通工程学院,贵阳550003;[2]北京交通大学,土木建筑工程学院,北京100044;[3]贵州大学,土木工程学院,贵阳550025;[4]贵州大学,资源与环境工程学院,贵阳550025

第一机构：贵州理工学院交通工程学院

年份：2018

卷号：26

期号：5

起止页码：1300-1310

中文期刊名：工程地质学报

外文期刊名：Journal of Engineering Geology

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：贵州省科学技术基金(黔科合J字[2015]2033号);贵州大学研究生创新基金(研理工2017045);贵州省地质灾害监测预警与决策支持平台建设(Z113278)资助。

语种：中文

中文关键词：碱污染红黏土;抗剪强度;微观结构;破裂面

外文关键词：Alkali contaminated red clay;Shear strength;Microstructure;Fracture plane

摘要：碱污染使得贵州某铝厂地基红黏土孔隙比、比重和塑性指数降低。本文结合实际污染液质量分数及入磨母液为污染源,考虑时间和质量分数效应,对碱污染原状红黏土通过室内直剪试验,研究其抗剪强度的变化。并从碱污染红黏土剪切位移为4 mm时破裂面的微观结构入手,对其微观孔隙、颗粒进行定性和定量分析,探究其剪切破坏时的破裂方式。结果表明:高质量分数下,抗剪强度整体增加,土中多为惰性孔隙,孔隙方向性较好,颗粒变得较为狭长;入母液下,抗剪强度整体增加最多,土中几乎全为惰性孔隙,孔隙方向性最好,颗粒最为狭长;低质量分数下,抗剪强度整体减少,土中内活性孔隙仍较多,孔隙方向性较差,颗粒仍保持较好圆度。为碱污染红黏土的改良以及宏-微观的定量化研究提供一定的参考。
The vulnerability of the foundation of a factory building in Guizhou is due to the Alkali pollution,which originates the decrease of void ratio,specific weight,and plasticity index of the land.To study the transformation of shear strength of red clay,the authors design laboratory experiments combined with the pollution of the alkali concentration and the sources of the production process of Alumina.The facts of maintenance time and concentration of alkali liquor are also considered into the experiments.Within the help of technologies like scanning electron microscope(SEM),the results are concluded and supported by the raw data.Starting with the microstructure of the fracture surface of the red clay contaminated by alkali when the shear displacement is 4￣￣mm,the fracture mode of the micro-pore and particle is analyzed qualitatively and quantitatively,and the fracture mode during the shear failure is explored.The achieved results suggest that in high NaOH solution shear strength are increased,most of the pores are inert pores,the direction of the pores is good,and the particles become longer.In the sources of the production process of Alumina,shear strength are the best.All most of the pores are inert pores,direction of the pores is the best,the particles become the longest.In low NaOH solution,shear strength are decreased,there are many macropores in the soil,the direction of pores is poor,and the particles are still in good roundness.It should be paid attention to in the project,which can provide some reference for the improvement of red clay polluted by alkali.