采煤沉陷区深层土壤物理性质时空变化研究

Temporal and spatial variation of deep soil physical properties in coal mining subsidence area

为了研究深层土壤容重、孔隙度以及含水率时空变化,基于榆神府矿区纳林河二号矿采煤沉陷区实测数据,研究了0~10m深度的土壤含水率及土壤容重、孔隙度的时空变化规律。结果表明,随着采煤沉陷区形成时间的推移,土壤容重逐渐减小,孔隙度逐渐增加,土壤含水率有所恢复。在空间分布上,拉伸区土壤容重低于盆底区,土壤孔隙度高于盆底区,说明采煤沉陷对拉伸区地表结构的影响更为明显且持久;拉伸区土壤含水率变化小于盆底区,纵深方向上0~2m土壤含水率主要受采煤地裂缝影响,6~10m主要受地下水变化影响,中间为过渡地带,土壤含水率相对稳定。

In order to study the spatiotemporal changes of deep soil bulk density, porosity and water content, based on the measured data of coal mining subsidence area of Nalinhe No.2 Mine in Yushenfu mining area, the temporal and spatial changes of soil moisture content, soil bulk density and porosity at 0~10m depth are studied.The results show that with the increase of the formation time of coal mining subsidence area, the soil bulk density gradually decreases, the porosity gradually increases, and the soil moisture content recovers.In terms of spatial distribution, the soil bulk density in the tensile area is lower than that in the basin bottom area, and the soil porosity is higher than that in the basin bottom area, indicating that the influence of coal mining subsidence on the surface structure in the tensile area is more obvious and lasting;the change of soil moisture content in the stretching area is less than that in the basin bottom area.The 0~2m soil moisture content in the depth direction is mainly affected by coal mining ground fissures, and the 6~10m soil moisture content is mainly affected by the change of groundwater.The middle is a transition zone, and the soil moisture content is relatively stable.