黄土区露天煤矿大型机械压实对土壤孔隙特性的影响
发布时间：2019-05-22 14:34
【摘要】：在矿区开采和复垦过程中大型机械的使用产生了土壤压实,并严重扰动了土壤内部结构,土壤孔隙作为土壤水气交换的重要场所决定着土壤水分和空气状况,进而影响复垦土壤质量与肥力。本文采用先进的CT技术对平朔矿区安太堡露天煤矿内排土场不同压实程度(重度压实、较重度压实、中度压实、轻度压实)以及未采矿区的土壤进行分层扫描,依据VGstudio软件对土壤孔隙分布进行三维可视化重建,同时依据Linux虚拟系统平台中QuantIm编程软件进行土壤孔隙三维体积、表面积、平均曲率以及连通度等参数计算提取,并结合土壤孔隙大小、数量及孔隙度等参数对压实土壤孔隙进行定量表征,借此进一步分析机械压实对土壤孔隙的影响作用机理。结果表明:(1)CT扫描作为先进的微观介质定量化研究方法可以快速准确获取土壤孔隙分布特征信息,依据扫描图片可实现孔隙分布的三维重建以及定量表征。(2)土壤孔隙三维体积、表面积及平均曲率密度与不同土层贯入阻力呈负相关关系,而土壤孔隙三维连通度密度及欧拉数与贯入阻力呈正相关关系。(3)压实土壤孔隙三维参数特性之间具有较好的相关性,相关系数在0.786~1.000之间,可以从不同的角度反映机械压实对土壤孔隙造成的影响。(4)随着压实强度的增大,不同样点及不同土层深度的孔隙度和孔隙数量基本呈减小的趋势,大孔隙受机械压实作用影响最大,中孔隙次之,小孔隙最小。(5)在重度压实程度下,小孔隙数量较少,导致土壤孔隙三维表面积密度值较小,而轻度压实下,小孔隙数量较多,孔隙三维表面积密度值较大;压实导致大孔隙被填入小孔隙,凸毛孔较少,且大都呈水平方向,进而孔隙三维平均曲率较低;在重度压实程度下,完全隔离孔隙较多,导致孔隙连通度最差,且其值也最大,轻度压实区则相反。本研究可为黄土区露天煤矿排土场复垦工作和压实问题的有效解决提供理论基础。
[Abstract]:In the process of mining and reclamation, the use of large machinery has produced soil compaction and seriously disturbed the internal structure of soil. Soil pores, as an important place for soil water and gas exchange, determine the condition of soil moisture and air. And then affect the quality and fertility of reclaimed soil. In this paper, advanced CT technology is used to scan the soil in Antaibao opencast coal mine in Pingshuo mining area with different compaction degrees (severe compaction, moderate compaction, mild compaction) and soil in unmining area. The 3D visualization reconstruction of soil pore distribution is carried out according to VGstudio software, and the parameters such as soil pore volume, surface area, average curvature and connectivity are calculated and extracted according to QuantIm programming software in Linux virtual system platform. Combined with the parameters of soil pore size, quantity and porosity, the compacted soil pores were quantitatively characterized, and the mechanism of mechanical compaction on soil pores was further analyzed. The results show that: (1) as an advanced quantitative research method of microscopic media, CT scanning can obtain the characteristic information of soil pore distribution quickly and accurately. According to the scanning images, the three-dimensional reconstruction and quantitative characterization of pore distribution can be realized. (2) the three-dimensional volume, surface area and average curvature density of soil pores are negatively correlated with the penetration resistance of different soil layers. However, the three-dimensional connectivity density and Euler number of soil pores were positively correlated with penetration resistance. (3) there was a good correlation between the three-dimensional parameters of compacted soil pores, and the correlation coefficient was 0.786 鈮，
本文编号：2483011
[Abstract]:In the process of mining and reclamation, the use of large machinery has produced soil compaction and seriously disturbed the internal structure of soil. Soil pores, as an important place for soil water and gas exchange, determine the condition of soil moisture and air. And then affect the quality and fertility of reclaimed soil. In this paper, advanced CT technology is used to scan the soil in Antaibao opencast coal mine in Pingshuo mining area with different compaction degrees (severe compaction, moderate compaction, mild compaction) and soil in unmining area. The 3D visualization reconstruction of soil pore distribution is carried out according to VGstudio software, and the parameters such as soil pore volume, surface area, average curvature and connectivity are calculated and extracted according to QuantIm programming software in Linux virtual system platform. Combined with the parameters of soil pore size, quantity and porosity, the compacted soil pores were quantitatively characterized, and the mechanism of mechanical compaction on soil pores was further analyzed. The results show that: (1) as an advanced quantitative research method of microscopic media, CT scanning can obtain the characteristic information of soil pore distribution quickly and accurately. According to the scanning images, the three-dimensional reconstruction and quantitative characterization of pore distribution can be realized. (2) the three-dimensional volume, surface area and average curvature density of soil pores are negatively correlated with the penetration resistance of different soil layers. However, the three-dimensional connectivity density and Euler number of soil pores were positively correlated with penetration resistance. (3) there was a good correlation between the three-dimensional parameters of compacted soil pores, and the correlation coefficient was 0.786 鈮，
本文编号：2483011
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