采煤沉陷区冻结滞水消融过程中土壤水分变化规律

On Soil Moisture Variation During Thaw Process of Frozen Stagnant Water in Mining Subsidence Area

冻结滞水的倒置富水性和双向融化特性,使其消融过程中土壤水分迁移动向发生变化。采用烘干法,对采煤沉陷区不同立地类型冻结滞水消融过程中的土壤含水率进行了测定。结果表明:(1)随着融化时间的延长,采煤沉陷区阴坡土壤含水率峰值沿着垂直方向逐渐向下推移。冻结滞水融化第2天和第5天,土壤含水率峰值出现在0~10 cm土层;融化第8天土壤含水率最大值出现在20~30 cm土层;融化第11、14和17天土壤含水率最大值均出现在50~60 cm土层;(2)采煤沉陷区沟坡地冻结滞水融化第2天和第5天土壤含水率峰值均出现在20~30 cm土层;融化第8、11、14和17天土壤含水率最大值均出现在30~40 cm土层;(3)采煤区和非采煤区的冻结滞水含水率峰值在冻土层之下。

Frozen stagnant water possesses inverted enriching water and two-way melting characteristics, which make soil moisture migration trend change during its melting process. In this paper, soil moisture variation was studied during the thaw process of frozen stagnant water in different terrains in mining subsidence area by using the drying method. The results showed that：1） with the extension of melting time, soil moisture peak of shady slope in mining subsidence area decreased gradually along the vertical direction. Soil moisture peak of frozen stagnant water appeared in 0-10 cm on the melted 2nd day and 5th day, appeared in 20-30 cm on the melted 8th day, in 50-60 cm on the melted 11th day, 14th day and 17th day. 2） Soil moisture peak of gully-slop lands appeared in 20-30 cm on the melted 2nd day and 5th day, and in 30-40 cm on the melted 8th day, 11th day, 14th day and 17th day. 3） The moisture peak layer of frozen stagnant water was always under the frozen layer in the mining area and the non-mining area.