摘要
通过测定和计算毛乌素沙地东南缘补连塔煤矿塌陷区和非塌陷区风沙土机械组成、容重、孔隙度,应用空间对比法研究采煤塌陷对风沙土物理性质的影响。试验结果表明:与非塌陷区相比,塌陷区物理性粘粒含量明显减少(P<0.05),尤其地表10 cm土层最为显著;与非塌陷区相比,塌陷区风沙土容重、孔隙度在不同坡位有明显差异,其中沙丘顶部和中部容重和孔隙度变化不明显(P=0.1),而沙丘底部和丘间低地容重明显减小,孔隙度明显增大(P<0.05);从垂直剖面上看,0 cm^40 cm层容重和孔隙度无明显变化(P=0.1),40 cm^100 cm层容重明显变小,孔隙度明显增大(P<0.05);裂缝密度对风沙土容重、孔隙度的影响不明显;在采空区边界,陷落幅度对风沙土容重影响较小,在采空区内部随着陷落幅度的增大,低位陷落体容重有随机减小趋势。
The influence of mining subsidence on some soil physical and chemical properties were studied based on measuring and figuring out the soil mechanical composition, bulk density and soil porosity of subsidence area and no - subsidence area in Bulanta mining area that lies in southeast Maowusu Sandland. The result showed： the physical clay content of collapsing dune, especially in the 10cm of surface, significantly decreases ; Bulk density and soil porosity in top and middle of collapsing dune is not significantly different, however, bulk density in bottom and depression of collapsing dune significantly decreases, soil porosity in bottom and depression of collapsing dune significantly increases; Bulk density and soil porosity from 0 to 40cm is not significantly different, but bulk density from 40 to 100cm significantly decreases, soil porosity from 40 to 100cm significantly inereases; Slit density has little effect on bulk density and soil porosity; The depth of subsidence has little effect on bulk density at the border of subsidence area. With the increase in subsidence depth, the margin of soil bulk density in the two sides of slit increases random inside the subsidence area.
出处
《内蒙古农业大学学报（自然科学版）》
CAS
2006年第4期37-41,共5页
Journal of Inner Mongolia Agricultural University(Natural Science Edition)
基金
神华能源股份有限公司项目
国家科技攻关项目(2005BA17A04)
内蒙古自然科学基金(200508010608)
关键词
采煤塌陷
风沙区
机械组成
容重
孔隙度
Mining subsidence
windy desert area
mechanical composition
bulk density
soil porosity
