不同类型生物胶复合黏土蒸发开裂规律研究  

Experimental Study on Cracking by Evaporation of Clay Modified by Different Types of Biological Glue

作　　者：胡梦园 张晨阳 薛建 胡国长 马柯 宋泽卓 HU Mengyuan;ZHANG Chenyang;XUE Jian;HU Guochang;MA Ke;SONG Zezhuo(School of Earth Sciences and Engineering,Hohai University,Nanjing,Jiangsu 211100,China;Institute of Geology and Mineral Resources Survey of Jiangsu Province,Nanjing,Jiangsu 210018,China;Jiangsu Shanshui Ecological Environment Construction Engineering Co.,Ltd.,Nanjing,Jiangsu 210000,China)

机构地区：[1]河海大学地球科学与工程学院,江苏南京211100 [2]江苏省地质矿产调查研究所,江苏南京210018 [3]江苏省山水生态环境建设工程有限公司,江苏南京210000

出　　处：《河北工程大学学报（自然科学版）》2024年第4期36-43,共8页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：江苏省地质矿产勘查局科研项目(2023KY15);江苏省研究生实践创新计划项目(SJCX22_0177);国家自然科学基金资助项目(41877212)。

摘　　要：为研究黏土蒸发开裂规律,对素土试样;黄原胶、瓜尔胶及二者1∶1调和的混合胶复合黏土试样进行蒸发开裂试验,探究不同类型生物胶复合黏土试样含水率及蒸发速率随时间的变化情况,以及试样裂隙率和裂隙发育形态随含水率变化的特征情况。结合扫描电镜试验对复合黏土试样的微观结构及作用机理进一步分析。结果表明,土体试样蒸发过程经历表面自由水、内部自由水、弱结合水的散失,蒸发速率逐渐减小。蒸发过程中,裂隙的产生减少水分迁移路径,同时空气进入试样内部,使得试样渗透系数减小,二者相互作用使得蒸发速率动态平衡。当土体颗粒间作用力平衡时,裂隙不再发育,蒸发速率逐渐降低。生物胶的掺入使得试样抗开裂能力增强,裂隙发育减弱。To study the law of clay evaporation cracking,the evaporation cracking tests of plain soil samples;xanthan gum,guar gum and their 1∶1 mixed gum composite clay samples were carried out to explore the changes of water content and evaporation rate of different types of biological glue composite clay samples with time,and the characteristics of the fracture rate and fracture development morphology of the sample with the change of water content.The microstructure and mechanism of the composite clay samples were further analyzed by scanning electron microscopy.The results show that the evaporation process of soil sample experienced the loss of surface free water,internal free water and weak bound water,while the evaporation rate gradually decreased.During the process of evaporation,the formation of cracks reduces the water migration path,and the entry of air reduces the permeability coefficient of the sample,and the interaction between them makes the evaporation rate dynamic equilibrium.When the force between soil particles is balanced,the cracks no longer develop and the evaporation rate gradually decreases.The anti-cracking ability of the sample was enhanced and the crack development was wea-kened by the incorporation of biological glue.

关 键 词：黏土 蒸发开裂 微观结构 黄原胶 瓜尔胶 

分 类 号：TU42[建筑科学—岩土工程]