文献类型：期刊文献

中文题名：植被对土质覆盖层水分运移和存储影响试验研究

英文题名：Experimental study on effects of vegetation on water transport and storage in soil cover

作者：焦卫国 詹良通 季永新 贺明卫 刘振男

第一作者：焦卫国

机构：[1]贵州理工学院土木工程学院,贵州贵阳550003;[2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058;[3]贵州中建建筑科研设计院有限公司,贵州贵阳550006

第一机构：贵州理工学院土木工程学院

年份：2020

卷号：42

期号：7

起止页码：1268-1275

中文期刊名：岩土工程学报

外文期刊名：Chinese Journal of Geotechnical Engineering

收录：CSTPCD;;EI(收录号：20203309055749);Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：黔科合基础项目([2017]1079,[2017]1513-4);黔科合(LH字[2016]7096);中建四局科技研发项目(CSCEC4B-2015-KT-03);六盘水市科技支撑计划项目[52020-2018-01-04]。

语种：中文

中文关键词：垃圾填埋场;土质覆盖层;植被;须根;水分运移;储水能力

外文关键词：landfill;soil cover;vegetation;fibrous root;water transport;water storage capacity

摘要：植被在土质覆盖层水分存储–释放环节中扮有重要的角色,对防渗能力有重要的影响。在填埋场现场建设了大尺寸黄土土质覆盖层试验基地(长×宽:30m×20m),在基地不同测试区种植了植被并进行了土质覆盖层现场降雨试验。实测验证了黄土土质覆盖层最大储水能力;分析了有植被条件下黄土土质覆盖层水分运移和渗透特性;对比了植被条件对覆盖层水分运移和储水能力的影响。结果表明:①有植被条件黄土土质覆盖层可用储水量理论值Sfac为278.32 mm,实测值Sf?ac为259.82 mm,实测值比理论值小18.50 mm(小6.65%);②植被种植增大了根系生长区的渗透系数,无植被条件饱和渗透系数ks为8.27×10-5 cm/s,有植被条件饱和渗透系数ks大于8.27×10-5 cm/s。无植被时水分首先在覆盖层浅部土层存储,随着降雨的继续逐渐下渗至深层土;有植被时水分在土层全断面存储;③须根系、初期植被条件对毛细阻滞覆盖层储水能力影响较小。有植被条件实测可用储水量Sf?ac为259.82 mm,无植被条件为251.95mm,前者仅比后者大7.87 mm(大3.12%)。有植被条件实测总储水量Sf?ac为381.90 mm,无植被条件为374.03 mm,前者比后者大7.87 mm(大2.10%)。有、无植被条件黄土土质覆盖层储水能力接近,一方面是由于须根植被根系深度分布较浅(0~50 cm);另一方面是由于植被生长时间短未能经历一个完整的生长周期对土体结构影响不显著。
Vegetation plays an important role in water storage and release of soil cover and in impermeable capability of soil.A large-scale loess soil cover(30 m×20 m)is built in field.The vegetation is planted in different areas and rainfall tests are carried out.The maximum water storage capacity is measured.The water transport,saturated permeability coefficient,effects of vegetation on water transport and storage capacity are analyzed and compared.The results show that:(1)The theoretical value of available water storage with vegetation is 278.32 mm,the measured one is 259.82 mm,and the latter is 18.5 mm(6.65%)smaller than the former.(2)The vegetation increases the saturated permeability coefficient of root growth area.It is 8.267×10-5 cm/s without vegetation,and is more than 8.267×10-5 cm/s with vegetation.Without vegetation,water is stored in shallow soil layer firstly and gradually infiltrates into deep soil,but it is stored in the whole section of soil with vegetation.(3)The fibrous root and initial vegetation have some influences on water storage capacity of soil cover.The available water storage measured in the tests is 259.82 mm with vegetation and 251.95 mm without vegetation.The former is only 7.87 mm(3.12%)larger than the latter.The total water storage measured in the tests is 381.90 mm with vegetation and 374.03 mm without vegetation.The former is only 7.87 mm(2.10%)larger than the latter.The water storage capacity of soil cover with or without vegetation is similar.It may be that,on one hand,the vegetation with fibrous root system is shallow(0~50 cm),on the other hand,the short growth period of vegetation has no significant effects on soil structure.