摘要
应用正交法设计试验,定量地分析了改良黄土抗压强度、抗剪强度指标以及渗透系数的影响因素和影响大小,得到了改良黄土的最优掺量。另外,通过扫描电镜试验探究纳米黏土材料对黄土的改良机理。研究表明:(1)影响改良黄土抗压强度因素有纳米黏土掺量、含水率和养护龄期,影响黏聚力、内摩擦角、渗透系数的因素有掺量、干密度、围压;(2)在不同影响因素下,纳米蒙脱土比凹凸棒土更能有效提高黄土的抗压强度;(3)当材料掺量小于等于1%时,凹凸棒土改良黄土的抗剪强度指标总体高于纳米蒙脱土抗剪强度指标,渗透系数则相反,而当掺量大于等于2%时,则相反;(4)当凹凸棒土材料掺加量为1%、纳米蒙脱土材料掺量为2%时,改良黄土表面最为致密,孔隙最少。
The orthogonal design test was used to quantitatively analyze the influencing factors and influence degree of compressive strength,shear strength index,and permeability coefficient of improved loess,and the optimal content of improved loess was obtained.In addition,the improvement mechanism of nano-clay materials on loess was explored by scanning electron microscopy.The results show that:①The factors affecting the compressive strength of improved loess are the content of nano-clay,water content,and curing age,and the factors affecting cohesion,internal friction angle,and permeability coefficient are the content,dry density,and confining pressure.②Under different influencing factors,nano-montmorillonite can effectively improve the compressive strength of loess than attapulgite.③When the material content is less than or equal to 1%,the shear strength index of improved loess by attapulgite is generally higher than that by nanomontmorillonite,and the permeability coefficient is opposite.However,when the material content is greater than or equal to 2%,the situation is different.④When the attapulgite content is 1%,and the nanomontmorillonite content is 2%,the surface of the improved loess is the densest,and the porosity is the smallest.
作者
赵丹妮
曹宝花
许江波
南亚林
陈能远
张鹏
王和平
ZHAO Danni;CAO Baohua;XU Jiangbo;NAN Yalin;CHEN Nengyuan;ZHANG Peng;WANG Heping(School of Highway,Chang'an University,Xi'an,Shaanxi 710064,China;Xi'an Changda Highway Engineering Inspection Center Co.,Ltd.,Xi'an,Shaanxi 710064,China;China DK Comprehensive Investigate and Design Research Institute Co.,Ltd.,Xi'an,Shaanxi 710054,China;Soil Engineering Technology Research Center of Shaanxi,Xi'an,Shaanxi 710054,China;Shaanxi Provincial Communication Construction Testing&Measuring Co.,Ltd.,Xi'an,Shaanxi 710117,China)
出处
《中外公路》
2024年第1期55-65,共11页
Journal of China & Foreign Highway
基金
国家自然科学基金资助项目(编号:11972374,41790443)。
