【作者】 刘钊钊； 高中南； 马紫娟； 刘富强； 梁收运； 钟秀梅；

【Author】 LIU Zhaozhao;GAO Zhongnan;MA Zijuan;LIU Fuqiang;LIANG Shouyun;ZHONG Xiumei;College of Civil Engineering and Mechanics,Lanzhou University;Lanzhou Institute of Seismology,CEA;Key Laboratory of Loess Earthquake Engineering,CEA;

【机构】 兰州大学土木工程与力学学院； 中国地震局兰州地震研究所； 中国地震局黄土地震工程重点实验室；

【摘要】 为深入研究工业副产品木质素对黄土的改良加固效果和作用机理,将木质素用于黄土改良加固处理,通过对不同掺量的木质素改良黄土进行扫描电镜试验,对比分析了不同掺量下木质素改良黄土的孔隙细观结构变化,并基于PCAS孔隙图像识别与分析系统,研究了木质素改良黄土细观结构参数随掺量的变化规律,结合无侧限抗压强度试评价分析改良加固效果。结果表明:木质素可以有效填充黄土孔隙,增强颗粒间的胶结作用;木质素掺量对改良黄土内部孔隙细观结构特征有较大影响;在28 d养护龄期条件下,表观孔隙比、平均孔隙面积、孔隙度分维值和平均形状系数随着木质素掺量的增加先迅速减小后缓慢增加,分形维数的变化趋势则完全相反,2%和4%掺量的改良黄土概率熵较低,定向性较好;2%木质素掺量的改良黄土抗压强度最大,掺量过大反而会降低抗压强度。更多还原

【Abstract】 In order to further research the microscopic mechanism of the lignin-modified loess,the pore microscopic characteristics of the lignin-modified loesswithdifferent lignin contents is analyzed based on SEM.Moreover,the variation of microscopic parameters of the lignin-modified loess with different lignin contents is studied based on PCAS.Combined with the unconfined compressive strength test to evaluate the effect of ligninmodified loess.The results show that lignin can effectively fill the pores of loess and enhance the cementation between particles.The content of lignin has a great influence on the microscopic characteristics.Under the curing age of 28 days,the facial porosity,average pore area,pore porosity fractal dimension and average form factor first rapidly decrease and then slowly increase with the increase of lignin content,while the fractal dimension is completely opposite,and the probability entropy of modified loess with the lignin content of 2% and 4% is low.The modified loess with the lignin content of 2 % has the highest compressive strength,while too much lignin content will reduce the compressive strength.更多还原