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为了更好地了解菱镁矿区土壤沉积型结皮对土壤渗透性能的影响,通过实验室模拟轻烧氧化镁粉尘沉降,进而形成结皮,分析多次干湿交替、结皮坚实度、结皮容重以及结皮厚度对土壤渗透性能的影响。结果表明:与普通的物理性结皮相比,氧化镁粉尘所造成的沉积型结皮对土壤结构及渗透性能影响更大;结皮坚实度和结皮容重均与土壤渗透速度呈负相关关系,且随干湿交替次数的增加,二者对渗透速度的影响愈加显著;而结皮厚度不仅与渗透速度呈负相关关系,与沉降粉尘的性质、结皮发育程度和上下层厚度也有一定关系。
In order to better understand the effect of soil-deposited crusts on soil permeability in the magnesite area, the sedimentation of light-burned magnesia was simulated in the laboratory to form crusts. The results of multiple dry-wet alternations, crust firmness and crust Bulk density and crust thickness on soil permeability. The results show that compared with the ordinary physical crust, the sedimentary crust caused by magnesia dust has a greater influence on the soil structure and permeability; the crust firmness and crust weight are negatively correlated with the soil infiltration rate, And the alternation of wetting and drying times is more significant. The crust thickness is not only negatively correlated with the infiltration rate, but also has a certain relationship with the nature of sedimentation dust, the degree of crustal development and the thickness of the upper and lower layers.