基于水分特性的采煤沉陷地充填复垦黄河泥沙容重优选  

Optimal bulk density infilling reclamation of mining subsidence land with Yellow River sediment based on water characteristics

作　　者：王晓彤[1] 胡振琪[1] 梁宇生[1] 陈洋 Wang Xiaotong;Hu Zhenqi;Liang Yusheng;Chen Yang(Institute of Land Reclamation and Ecological Restoration,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)土地复垦与生态重建研究所,北京100083

出　　处：《农业工程学报》2018年第16期258-264,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(41771542)

摘　　要：为探究黄河泥沙容重与水分运动特征参数的关系,优选黄河泥沙充填复垦的最佳容重设计,运用土壤的概念和性质进行类比研究。根据不同容重条件下饱和含水率与饱和导水率的实测值、van Genuchten模型中进气吸力相关参数?和经验参数m的模拟值,分别建立经验模型,相关系数0.992~0.995(P<0.01),决定系数0.938~0.990,理论值与实测值相对误差均控制在10.77%以内。研究结果:1)饱和含水率与饱和导水率均随黄河泥沙容重的增大而减小;2)黄河泥沙中非毛管孔隙度占比高,渗透初期非饱和导水率大,在低吸力段迅速失水;3)黄河泥沙容重为1.5 g/cm3毛管孔隙度最大,更有利于土壤有效水分的保持。在黄河泥沙充填复垦采煤沉陷地的实践过程中对黄河泥沙充填层进行合理的机械压实,使容重控制为1.5 g/cm3,能够在一定程度上提高黄河泥沙的持水性,实现黄河泥沙充填复垦耕地生产力水平的提高。Coal mining has caused large areas of arable land to collapse and accumulate water and these areas cannot be cultivated.Since these areasare located on banks of the Yellow River,using the sediment from the Yellow River as filling for mining subsidence land,which could not only dredge the Yellow River but also solve the problem of lack of filling materials.However,sediment form the Yellow River is sandy in texture with limited capacity to retain water and nutrients.Related researches showed that bulk density mainly affecting soil water characteristic.In order to study the relationship between the bulk density of sediments from the Yellow River and its water movement parameters and select the best bulk densityto fill mining subsidence land,an experiment was conducted in thelab with 8 different bulk densities under identical conditions.The saturated water content and saturated hydraulic conductivity of the Yellow River sediment were measured under different bulk densities.Using the Rosetta module built-in the HYDRUS-1D softwarebased on the model of Van Genuchtento simulatereciprocal of air entryvalue?and experiencedparameter m,and meanwhile,generation of corresponding water characteristic curves under different bulk densities.Based on the analysis of measured values and simulated results,the empirical models between the bulk density of Yellow River sediment and saturated water content,saturated hydraulic conductivity and model parameters(?,m)were established,respectively.The correlation coefficients were all greater than 0.99(P<0.01),and the determination coefficients were all greater than 0.93,and the relative error between the measured and simulated value were all less than 10.77%.Results showed that thematric potential was 0 in saturated condition,and the sediment water characteristics of the Yellow River were mainly determined by porosity.The saturated water content and thesaturated hydraulic conductivity both tended to decrease with the increase of the bulk density of the Yellow River sediments.While?b(bulk den

关 键 词：含水率 孔隙度 复垦 黄河泥沙 充填复垦 

分 类 号：TD88[矿业工程—矿山开采] S28[农业科学—农业水土工程]