摘要
采用黄原胶对掺砂黏性土进行复合改良,通过一系列不同黄原胶和砂粒含量条件下的干燥开裂试验,分析土体表层裂隙特征,探究不同黄原胶和砂粒含量对土体抗裂性能的影响,并对抗裂机理进行较深入的分析。研究结果表明:黄原胶和砂粒作为添加剂均能在一定程度上抑制裂隙发育,在二者共同作用下的土体具有更好的抗裂性能。当黏性土试样中黄原胶含量由0增加至0.25%时,其裂隙率由11.586%减小至0。当掺砂率小于30%时,土体开裂受影响较小,无黄原胶试样裂隙率在10%~14%之间,掺砂率增大至70%时,裂隙率降低至1.412%;0.15%黄原胶复合掺砂土样无开裂迹象。黄原胶能够增强黏土颗粒间的粘聚作用,与砂土颗粒胶结固化形成稳定结构,提升土体抵抗断裂的能力,从而达到增强黏性土抗裂性能的目的。
The composite of xanthan gum and clay mixed with sand was used to analyze the crack characteristics of soil surface through a series of dry cracking tests under different xanthan gums and sand contents, and to explore the influence of different xanthan gums and sand contents on the crack resistance performance of soil. In addition, the mechanism of crack resistance is analyzed in depth, and the relevant results have certain reference value for the prevention and control of clay cracks in practical engineering. The results show that both xanthan gum and sand as additives can inhibit the crack development to a certain extent, and the soil under the combined action of them shows better crack resistance. When the content of xanthan gum in clay increases from 0 to 0.25%, the crack intensity factor(CIF) decreases from 11.586% to 0. When the sand ratio is less than 30%, the cracking of soil is less affected. The CIF of the sample without xanthan gum is between 10% and 14%. When the sand rate increases to 70%, the CIF decreases to 1.412%. The composite of sand mixed soil sample containing 0.15% xanthan gum does not crack. Xanthan gum can enhance the cohesion between clay particles and solidify with sand particles to form a stable structure, so as to improve the ability of soil to resist fracture and enhance the crack resistance of clay.
作者
黄兰华
赵宁宁
戴承江
梅绪哲
刘瑾
王梓
HUANG Lanhua;ZHAO Ningning;DAI Chengjiang;MEI Xuzhe;LIU Jin;WANG Zi(School of Earth Sciences and Engineering,Hohai University,Nanjing,Jiangsu 211100,China;Zhejiang Huadong Engineering Consulting Cooperation Limited,Hangzhou,Zhejiang 311100,China)
出处
《河北工程大学学报（自然科学版）》
CAS
2022年第3期23-29,共7页
Journal of Hebei University of Engineering:Natural Science Edition
基金
自然资源部国土(耕地)生态监测与修复工程技术创新中心开放课题(GTST2021-006)
中央高校基本科研业务费项目(B200203219)
国家自然科学基金资助项目(41472241)
江苏省研究生实践创新计划项目(SJCX21_0195)
大学生创新创业训练计划项目(202110294055)。
关键词
黄原胶
掺砂量
黏性土
裂隙发育
抗裂性能
xanthan gum
sand content
clayey soil
fracture development
crack resistance performance
