关键词：
土地复垦;土壤重构;水分运移;高潜水位;采煤塌陷区
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。
译 名：
Simulation of Moisture Transfer Law with Different Soil Reconstruction Models in Coal Mining Subsided Area with High Ground-water Level
作 者：
SONG Yangrui;WANG Jinman;LI Xinfeng;WU Kening;BAI Zhongke;College of Land Science and Technology,China University of Geosciences;Key Laboratory of Land Consolidation and Rehabilitation,Ministry of Land and Resources;
关键词：
land reclamation;;soil reconstruction;;moisture transfer;;high ground-water level;;coal mining subsided area
摘 要：
In the area with high ground-water level,large area of land subsidence and water accumulation was caused by long-term coal mining.At the same time,the farmland water cycle system has been destroyed,mainly revealed by the damage of surface water,groundwater and soil water.Compared with the surface water restoration and groundwater control,soil water control is more difficult,for it is necessary to study the soil moisture transfer law under different soil reconstruction models so as to choose the most excellent soil reconstruction model,namely,the best surface soil alternative,filling levels and the thickness of covering soil.Therefore,based on Jiawang subsided area of Xuzhou in Jiangsu province,the different soil reconstruction models were simulated by field sampling and indoor soil column experiment so as to observe the process of soil water running under fixed underground water level.The experiment was set up with 0—50cm of the soil column for soil filling,and 50—80cm for different soil substitute filling.According to the different 50—80cm filling,4experimental treatments were set up.The treatment I(soil filling)was control group,treatment II(fly ash filling),treatment III(coal gangue filling)and treatment IV(mixture filling of coal gangue and fly ash)were set up as test groups.The following conclusions can be drawn from our findings:(1)there was clear difference between the moisture content at top layer of reconstruction soil and that at lower layer,and moisture content at the lowest layer of soil was close to saturated moisture content,almost with no changes.(2)The moisture content in the boundary of different fillings changed greatly,and types of fillings had great influence on the vertical variation of soil moisture.(3)Moisture content variation in mixed filling reconstruction mode of coal gangue and fly ash was consistent with that in soil filling reconstruction mode,and the saturated moisture content was close,and the capacity of water retention and soil permeability in mixed filling reconstructionmode were excellent,so the reconstruction mode of mixed filling of coal gangue and fly ash is ideal soil reconstruction mode in coal mining subsidence area with high ground-water level.This study can provide theoretical basis and technical support for soil reconstruction in land reclamation and salinization control in coal mining subsidence with high ground water levels.
