木质素磺酸钙改良黄土的结构性机理  

The structural mechanism of calcium lignosulfonate loess

作　　者：刘东发 张豫川[1] 高旭龙 刘智璠 刘辰麟 LIU Dong-fa;ZHANG Yu-chuan;GAO Xu-long;LIU Zhi-fan;LIU Chen-lin(Key Laboratory of Mechanics on Disaster and Environment in Western China with the Ministry of Education,School of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China;Gansu China State Construction Engineering Corporation Municipal Engineering Investigation and Design Institute Co.Ltd.,Lanzhou 730000,China)

机构地区：[1]兰州大学土木工程与力学学院,西部灾害与环境力学教育部重点实验室,兰州730000 [2]甘肃中建市政工程勘察设计研究院有限公司,兰州730000

出　　处：《兰州大学学报（自然科学版）》2023年第4期468-475,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：甘肃省住房和城乡建设厅科研项目(JK2020-16)。

摘　　要：木质素磺酸钙(CL)改良黄土作用存在强度峰值,且各掺量达到峰值所需养护时间不同,表现出明显的掺量和龄期效应.在土工试验、微观试验和前人成果基础上,研究掺量和养护龄期对于CL改良土结构特征的影响,探讨其作用机理.研究表明,CL通过胶结、填充和团粒化作用,将素土的“颗粒,镶嵌+架空,接触”结构转变为“团粒,镶嵌,胶结+接触”结构,并降低颗粒的双电层厚度和表面溶液张力,从而提高工程性能.过量掺量的CL因强黏结性和引气作用,导致CL改良土向“团粒+片状,镶嵌+架空,胶结”结构转变,颗粒咬合摩擦降低,并产生大量气泡起到润滑作用,工程性能降低.The improving effect of calcium lignosulfonate(CL)has a strength peak,and the curing age which reaches the peak content is different,showing an obvious age effect.Based on the geotechnical tests,microscopic test and relevant achievements of predecessors,the influence of CL loess's structural mechanism with content and curing age was studied.The research showed that,because of CL through cementation,filling and mass granulation,the structure of loess in the"clastic-particles,mosaic+overhead pores,contact connection"form was changed into the structure of the"cumularspharolith,mosaic-pores,cementation+contact connection"form.Due to this change,thickness of the electric double layer and the surface solution tension of the particles were reduced,resulting in improvement of engineering properties.Due to the strong bonding and air entrainment with an excessive amount of CL,the structure of loess was changed into"cumularspharolith+sheet,mosaic+overhead pores,cementation connection",the particle bite friction was reduced and produced a large number of bubbles for lubrication,with the result that the engineering performance was reduced.

关 键 词：黄土 地基处理 木质素磺酸钙 结构性机理 

分 类 号：TU478[建筑科学—结构工程]