基于渗透原理的可吸水模型根系研发与性能研究  

Development and performance study of water uptake-able model root based on osmotic technique

作　　者：赵俊键 梁腾[1] 詹良通[1,2] 梁钧 陈延博 赵宇[1,2] 陈云敏[1,2] ZHAO Jun-jian;LIANG Teng;ZHAN Liang-tong;ANTHONY Kwan LEUNG;CHEN Yan-bo;ZHAO Yu;CHEN Yun-min(Center for Hypergravity Experimental and Interdisciplinary Research,Zhejiang University,Hangzhou 310058,China;Institute of Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Department of Civil and Environmental Engineering,Hong Kong University of Science and Technology,Hong Kong 999077,China)

机构地区：[1]浙江大学超重力研究中心,浙江杭州310058 [2]浙江大学岩土工程研究所,浙江杭州310058 [3]香港科技大学土木及环境工程系,中国香港999077

出　　处：《浙江大学学报（工学版）》2023年第7期1382-1392,共11页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(41961144018,52008368,51988101,51922112);香港研究资助局项目(C6006-20G)。

摘　　要：为了模拟自然植物根系的吸水过程,探究其对周边土体水文力学特征的影响机制,利用3D打印技术,设计并制造基于正渗透原理的新型可吸水模型根系.模型根系采用中空结构,侧壁开孔,外覆半透膜.当内部灌注聚乙二醇(PEG)溶液时,PEG溶液和土中水分间存在的渗透压梯度驱使了模型根系吸水.常重力模型根系吸水试验结果表明,在含砂粉质黏土中,循环浓度等效1 500 kPa渗透压的PEG溶液可在根系附近土体中产生最大约120 kPa的基质吸力,该基质吸力超过了真空法模型根系的理论最大产生吸力.通过在适当范围内调整PEG溶液的质量摩尔浓度,并控制溶液循环特征,模型根系可以具备不同的吸水能力,从而模拟不同的现实工况.A new 3-D printed water uptake-able model root based on osmotic technique was designed and manufactured in order to simulate the effects of water uptake by real plant roots and its influence on hydrological and mechanical properties of the surrounding soil.The model root was designed with a perforated hollow structure and wrapped with a semi-permeable membrane.Water was absorbed from soil by the osmotic pressure gradient between PEG solution and soil water when filled with polyethylene glycol(PEG)solution inside.Results of 1-g water uptake tests in silty clay with sand showed that circulating PEG solution with a concentration equivalent to an osmotic pressure of 1 500 kPa produced a maximum soil matric suction of approximately 120 kPa near the model root,overcoming the suction inducing limit of existing water uptake-able model root using vacuum technique.The model root could possess varied water uptake potential,hence simulate different evaporation scenarios through adjusting the molality of solute PEG within proper range and controlling solution circulating properties.

关 键 词：生态岩土工程 土体基质吸力 模型根系 渗透原理 3D打印技术 

分 类 号：TU43[建筑科学—岩土工程]