木质素改良粉土无侧限抗压强度特性  

Unconfined compressive strength properties of lignin modified silt

作　　者：周恩全[1] 居东煜 崔磊 张曼 左熹[2] ZHOU Enquan;JU Dongyu;CUI Lei;ZHANG Man;ZUO Xi(Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang,Jiangsu 212013,China;College of Architectural Engineering,Jinling Institute of Technology,Nanjing,Jiangsu 211169,China)

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013 [2]金陵科技学院建筑工程学院,江苏南京211169

出　　处：《江苏大学学报（自然科学版）》2023年第5期614-620,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51508236);江苏高校“青蓝工程”项目(苏教师函[2021]11号)。

摘　　要：为了研究木质素改良粉土的力学性能,通过无侧限抗压强度试验和扫描电镜试验研究了木质素改良土的无侧限抗压强度,分析了木质素掺量、养护龄期、孔隙率及骨架孔隙比的影响.研究结果表明:改良土的无侧限抗压强度随木质素掺量的增大呈先增大、后减小的趋势,随着养护龄期的增大呈逐渐增大的趋势;建立了双曲线模型,预测改良土的无侧限抗压强度与养护龄期、木质素掺量的关系;在粉土中因添加木质素而生成的胶结物质改变了粉土的孔隙率和骨架孔隙比,改良土无侧限抗压强度随着骨架孔隙比的增大而减小;木质素掺量为8%时,孔隙率和骨架孔隙比达到最小值,而无侧限抗压强度达到最大值.The unconfined compressive strength properties of lignin modified soil were investigated by unconfined compressive strength tests and scanning electron microscope tests,and the effects of lignin content,curing age,porosity and skeleton void ratio were analyzed.The results show that with the increasing of lignin content,the unconfined compressive strength of modified soil is increased with latter decreasing.The unconfined compressive strength of the modified soil is increased with the increasing of curing age.The established hyperbolic model can predict the relationship among unconfined compressive strength,curing age and lignin content.The addition of lignin changes the porosity and skeleton porosity ratio of the silt.The unconfined compressive strength of the modified soil is decreased with the increasing of skeleton porosity ratio.When the lignin content is 8%,the porosity and skeleton porosity ratio reach the minimum values,while the unconfined compressive strength reaches the maximum value.

关 键 词：木质素 粉土 无侧限抗压强度 骨架孔隙比 养护龄期 

分 类 号：U416.1[交通运输工程—道路与铁道工程]