土壤表面划痕与颗粒碰撞磨蚀实验研究

摘要/Abstract

摘要：

在沙漠地区,风蚀作用可以导致土壤表面破碎,土壤表面的性质不同,破碎的程度也不尽相同。划痕方法在测量土壤表面的比研磨能量上具有较好的效果,使用通用微型摩擦计(UMT)测量沙土、沙壤土、粉沙壤土、壤土,粉沙粘壤土和粉沙粘土6种不同土壤类型的土壤表面相对磨蚀能量和相对表面硬度,发现土壤表面相对硬度对土壤表面相对磨蚀能量有很大的影响。对沙土,沙壤土、粉沙壤土、壤土、粉沙粘壤土和粉沙粘土6种不同类型的土壤表面进行了颗粒碰撞磨蚀试验,结果表明,土壤表面的碰撞磨蚀速率与碰撞颗粒速度的平方成正比、土壤平均颗粒大小的2.6次方成正比,而与土壤表面相对磨蚀能量的1.5次方成反比,与土壤相对硬度的1.7次方成反比。

关键词: 划痕, 磨蚀, 表面硬度, 碰撞磨蚀速率

Abstract:

In desert regions, aeolian abrasion could make particles and aggregates fracture from the soil surface, and the fragmentation degree varies with different soil surface properties. This paper used a Universal Micro-Tribometer (UMT) to measure the surface specific abrasive energies and specific surface hardness of six soil types: sandy soil, sand loam, silt loam, loam, silt clay loam, and silt clay. The results demonstrated that the surface hardness of soils showed strong influences on its surface specific abrasive energy. Experiment of solid particles impacting erosion on these six soil surfaces showed that the soil surface impacting abrasion rate is in direct proportion to the square of particle speed and to the 2.6 power of mean grain size, whereas in inverse proportion to the 1.5 power of surface specific abrasive energy and to the 1.7 power of specific surface hardness.

Key words: scratching, abrasion, specific surface hardness, impacting abrasion rate

中图分类号:

S157.1

贾晓鹏;王海兵. 土壤表面划痕与颗粒碰撞磨蚀实验研究[J]. 中国沙漠, 2009, 29(2): 219-222.

JIA Xiao-peng;WANG Hai-bing. Experimental Study of Soil Surface Scratch and Particles Impacting Abrasion[J]. JOURNAL OF DESERT RESEARCH, 2009, 29(2): 219-222.

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