高潜水位采煤塌陷区重构土壤水分运移规律模拟研究

发布时间：2018-04-16 12:02

本文选题：土地复垦 + 土壤重构　；参考：《水土保持学报》2016年02期

【摘要】：以江苏省徐州市贾汪矿区为研究区,通过野外采样与室内土柱试验模拟不同土壤重构模式,对固定地下水位不同重构模式下土壤水分运移过程进行了观测。试验设置土柱上层0—50cm为土壤充填,50—80cm为不同表土替代物充填。按照下层50—80cm充填物的不同,设置4组处理,其中处理1为对照组(土壤充填),处理2(粉煤灰充填)、处理3(煤矸石充填)、处理4(煤矸石-粉煤灰混合物充填)为试验组。结果表明:(1)重构土壤上层含水率与下层相比变化明显,底层含水率临近于饱和含水率,变化微小;(2)在不同充填物的分界线处含水率变化明显,充填物类型对土壤水分垂直变化有较大影响;(3)煤矸石、粉煤灰混合物充填重构模式含水率变化规律与土壤充填模式最为一致,且饱和含水率最为接近,具有良好的保水、透气性,是高潜水位采煤塌陷区土地复垦最理想的土壤重构模式。本研究可以为高潜水位采煤塌陷区土地复垦的土壤重构以及盐渍化控制等提供一定的理论依据和技术支撑。
[Abstract]:Taking Jiawang mining area of Xuzhou City Jiangsu Province as the research area different soil reconstruction models were simulated by field sampling and soil column test. The soil moisture migration process under different reconstruction models of fixed groundwater level was observed.In the experiment, the upper layer of soil column (0-50cm) was set as soil filling (50-80 cm) and different topsoil substitutes were used as backfill.According to the difference of 50-80cm filling in the lower layer, four treatments were set up, among which treatment 1 was the control group (soil filling), treatment 2 (fly ash filling), treatment 3 (coal gangue filling) and treatment 4 (coal gangue-fly ash mixture filling) as test group.The results showed that the water content of the upper layer of the reconstructed soil was significantly different from that of the lower layer, and the water content of the bottom layer was close to the saturated water content, and the change of water content was slight.The type of backfill has great influence on the vertical variation of soil moisture. The change law of water content in the reconstruction model of fly ash mixture filling is the most consistent with that of soil filling model, and the saturated water content is the most close, and it has good water retention.Permeability is the most ideal soil reconstruction model for land reclamation in coal mining subsidence area with high water level.This study can provide some theoretical basis and technical support for soil reconstruction and salinization control of land reclamation in coal mining subsidence area with high diving level.
【作者单位】：中国地质大学土地科学技术学院;国土资源部土地整治重点实验室;
【基金】：国家“十二五”科技支撑计划项目(2011BAD04B03)
【分类号】：S152.7;TD88

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