陕北风沙滩地区采煤塌陷裂缝对包气带水分运移的影响:模型建立

陕北风沙滩地区高强度采煤对包气带水分运移产生影响。在区域调查的基础上,以榆树湾煤矿20108工作面开切眼附近裂缝为野外原位监测点,采用野外原位监测与室内数值模拟相结合的方法,建立采煤塌陷裂缝对包气带水分运移影响的水热耦合数学模型。利用野外原位监测数据对所建立的模型进行识别和验证,表明模型计算值与野外监测数据之间拟合较好,从而获取了相关的水热参数。利用此模型可定量回答裂缝对土壤水分运移的影响程度,揭示裂缝对土壤水分运移的影响机理,为陕北风沙滩地区保水采煤和生态恢复提供参考。

Influence of fissures due to coal mining on moisture transportation in the vadose zone in the blown-sand region of the Northern Shaanxi Province：Model establishment

High intensive coal mining will impact on the moisture and eco-environment in the Blown-sand Region of the Northern Shaanxi Province.On the fissure of cut of No.20108 coal face in the Yushuwan coal,by means of combination between in-situ field monitoring and numerical simulation,a coupling model between moisture and heat on the influence of the fissure due to coal mining on the moisture transportation of the vadose zone was established.After validation and calibration with field monitoring data from July 17th to 20th and July 25th to 30th,2014 respectively,relative moisture and heat parameters could be acquired.Then this model can answer the influence degree and reveal the influence mechanism of fissures on moisture transportation.All these can provide reference for coal mining under water-containing and ecological restoration in the Blown-sand Region of the Northern Shaanxi Province and other similar regions.