摘要
崩岗是鄂东南花岗岩地区普遍存在的土壤侵蚀现象。对通城县五里镇2个典型崩岗后壁的4层土体进行了野外测定与室内理化分析。结果表明:土体第1层和第2层的黏粒、有机质、游离氧化铁等胶结物质较多,结构稳定性较强,土壤凝聚力较大,有较强的抗剪强度和抗冲抗蚀性;土体第3和第4层性质相反;一旦土体第1层和第2层被破坏,第3和第4层暴露,在瀑流作用下,很容易被水侵蚀而形成崩岗。这一结果可为崩岗侵蚀机理研究及崩岗治理提供科学依据。
Hill collapse is a universal phenomenon of soil erosion in granite region in southeast of Hubei Province. Field test and laboratory physical and chemical analysis on 4 layer soil body at posterior faces of 2 typical collapsed hills in Wuli Town of Tongcheng County are conducted. The results show that a lot of cementing substances such as clay particles, organic matter, free iron oxide are found in the first and second soil layers, and soil structures are comparably stable, the soil has strong shear strength, anti - scouring and anti - erodibility ability for its larger cohesive force. The soil natures of the third layer and the fourth layer are opposite. If the first and second layers are destroyed, the soil in the third and fourth layers will be exposed and are scoured by water, resulting in hill collapsed. The results provide a scientific basis for mechanism research of slope collapse and erosion as well as control works.
出处
《人民长江》
北大核心
2013年第3期93-96,共4页
Yangtze River
关键词
崩岗
侵蚀机理
土壤侵蚀
溯源侵蚀
collapse hills
erosion mechanism
soil erosion
headward erosion
