边坡植被恢复中考虑微生物矿化和植被作用的Green-Ampt模型  

Improved Green-Ampt model considering effects of microbial mineralization and vegetation in biological restoration of slopes

作　　者：李旭[1] 高山 周成[1] 王一冰 钟启明[3] 陈群[1] LI Xu;GAO Shan;ZHOU Cheng;WANG Yibing;ZHONG Qiming;CHEN Qun(College of Water Resources&Hydropower,Sichuan University,Chengdu 610065,China;Guangxi New Development Transportation Group Co.,Ltd.,Nanning 530029,China;Geotechnical Engineering Department of Nanjing Hydraulic Research Institute,Nanjing 210024,China)

机构地区：[1]四川大学水利水电学院,四川成都610065 [2]广西新发展交通集团有限公司,广西南宁530029 [3]南京水利科学研究院岩土工程研究所,江苏南京210024

出　　处：《岩土工程学报》2023年第9期1953-1962,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(U22A20602,41977239);2020年度第三批广西交通运输行业重点科技项目(XFZ-KY-LYH-20200112)。

摘　　要：在边坡植被恢复中降雨入渗量的估算是很重要的,为探究石漠化边坡格构内微生物矿化联合植被作用的填土降雨入渗过程,在传统Green-Ampt模型基础上,针对表层矿化的土柱引入稳定入渗率,提出考虑微生物表层矿化(M)作用的改进G-A模型(M-G-A);针对含植株土柱,考虑复合土层的入渗过程,分别提出考虑植被(P)作用的改进G-A模型(P-G-A)以及考虑微生物矿化联合植被作用的改进G-A模型(PM-G-A)。利用改进G-A模型进行累计入渗量计算,并将计算结果与土柱试验实测值、Hydrus数值解进行对比分析。结果表明:M-G-A模型可以较好地描述累计入渗量随时间的变化,且矿化程度越高模型计算偏差越小,在强矿化作用下误差可控制在5%以内;P-G-A模型的计算误差随降雨历时而增加,但相较于Hydrus数值解可以减少误差约10%;PM-G-A模型的计算偏差随降雨历时呈现先增加后减小的趋势,总体上优于Hydrus数值解。改进G-A模型能够针对微生物表层矿化石漠化边坡格构内填土的生态恢复技术进行累计入渗量即蓄水量分析,具有一定的工程实用价值。The estimation of rainfall infiltration is very important in vegetation restoration of slopes.In order to explore the rainfall infiltration process of filling soil under microbial mineralization combined with vegetation in rock desertification slope lattice,based on the traditional Green-Ampt model,the stable infiltration rate is introduced into the surface mineralized soil column,and then an improved G-A model(M-G-A)considering microbial surface mineralization is proposed.For the soil column containing vegetation and considering the infiltration process of composite soil layer,an improved G-A model(P-G-A)considering the effects of vegetation and an improved G-A model(PM-G-A)considering the effects of microbial mineralization combined with vegetation are proposed respectively.The cumulative infiltration is calculated by using the improved G-A model,and the calculated results are compared with the measured values of soil column tests and Hydrus numerical solutions.The results show that the M-G-A model can well describe the variation of cumulative infiltration with time.The calculation accuracy of the model increases with the degree of mineralization,and the error can be controlled within 5%under the action of strong mineralization.The calculation error of the P-G-A model increases with the rainfall duration,but the error can be reduced by about 10%compared with the Hydrus numerical solution.The calculation deviation of the PM-G-A model first increases and then decreases with the rainfall duration,which is generally better than the numerical solution.The improved G-A model can be used to analyze the cumulative infiltration(water-storage capacity)for the ecological restoration technology in microbial mineralized soil in rocky desertificated slope lattice,which has a positive engineering practical value.

关 键 词：边坡植被恢复 降雨入渗 植株孔优先流 微生物表层矿化 Green-Ampt模型解析解 数值计算 

分 类 号：TU431[建筑科学—岩土工程]