文章摘要
张祖莲,洪斌,黄英,梁谏杰,邱观贵.降雨条件下云南红土理化特性对坡面侵蚀的影响研究[J].水土保持学报,2016,(3):
降雨条件下云南红土理化特性对坡面侵蚀的影响研究
Study on the Impact of the Physical Chemical Properties and the Erosion on the Slope of the Yunnan laterite under rainfall Conditions
投稿时间:2016-01-04  修订日期:2016-03-09
DOI:
中文关键词: 红土  颗粒组成  含水率  干密度  铁铝氧化物  侵蚀模数
英文关键词: laterite  granulometric composition  water content  dry density  iron aluminum oxide  erosion modulus
基金项目:国家自然科学(51269006;51168022;51568031);云南省教育厅科学研究基金(2011Y354)
作者单位邮编
张祖莲 昆明理工大学电力工程学院 650500
洪斌 昆明理工大学电力工程学院 
黄英 昆明理工大学电力工程学院 
梁谏杰 昆明理工大学电力工程学院 
邱观贵 昆明理工大学电力工程学院 
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中文摘要:
      针对一定初始状态的云南红土,在一定的坡度、坡长条件下,采用人工模拟降雨试验方法,研究降雨作用下红土理化特性对红土坡面侵蚀的影响。结果表明:(1)红土颗粒组成中粘粒含量对降雨作用下的红土坡面侵蚀影响最为显著,当红土粘粒含量增大约8.1%时,其侵蚀模数增加25.8 g/(m2.h);(2)红土初始含水率偏离最优含水率越远,红土的侵蚀模数越大。当初始含水率从接近最优含水率的24.6%增加到30.5%时,红土侵蚀模数从110.4g/(m2.h)增加到121.3g/(m2.h);(3)在初始干密度1.0g/cm3、1.1g/cm3、1.2g/cm3、1.3g/cm3、1.4g/cm3条件下,红土侵蚀模数呈先增大后减小的二次曲线变化趋势(R2 = 0.9528)。在初始干密度约为1.2g/cm3左右,红土侵蚀模数达到最大值126 g/(m2.h);(4)降雨作用使坡面红土中铁铝氧化物含量减少,接近坡脚处Fe2O3含量从初始状态的8.591%减小到8.143%,Al2O3含量从初始状态的22.242%减小到20.967%。而坡内红土铁铝氧化物含量则随深度增加,Fe2O3含量增加了0.407%、Al2O3含量增加了0.861%。铁铝氧化物含量的变化,将引起红土抗侵蚀能力的变化。
英文摘要:
      For a certain initial state of the Yunnan laterite and a certain slope, slope length,the effect of the physical and chemical properties of the Yunnan laterite on the erosion on slope under the f rainfall conditions is studied by using artificial simulated rainfall test method. The results indicated that:(1) The content of clay particles in the group of laterite is the most significant for slope erosion under rainfall effect. When laterite content increased about 8.1%, the erosion modulus increased by 25.8 g/(m2.h);(2) The more the initial water content of laterite is deviated from the optimum water content, the erosion modulus of laterite became bigger. When the initial water content of laterite increased from 24.6% near the optimum water content to 30.5%, the erosion modulus increased from 110.4g/(m2.h)to 121.3g/(m2.h). (3) Under the conditions of initial dry density 1.0g/cm3、1.1g/cm3、1.2g/cm3、1.3g/cm3、1.4g/cm3, the laterite erosion modulus was the change trend of the two curves which firstly increased and then decreased. At the initial dry density of 1.2g/cm3, the erosion modulus reached a maximum of about126 g/(m2.h).(4)The content of Fe2O3 and Al2O3 decreased by the effect of rainfall on the slope. The content of Fe2O3 decreased from 8.143% in the initial state to 8.591% and the content of Al2O3 decreased from 22.242% in the initial state to 20.967% on the surface of the slope foot. The content of Fe2O3 and Al2O3increased with depth in the slope. The content of Fe2O3 increased by 0.407%, and the content of Al2O3 increased by 0.861%. The changes of iron and aluminum oxide content will lead to the changes in the resistance to erosion of laterite .
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