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花岗岩红壤丘陵区崩岗土体界限含水量的温度效应研究
引用本文:张越,赵冬峰,郑勤敏,林金石,蒋芳市,黄碧妃,葛宏力,黄炎和.花岗岩红壤丘陵区崩岗土体界限含水量的温度效应研究[J].土壤学报,2022,59(1):118-128.
作者姓名:张越  赵冬峰  郑勤敏  林金石  蒋芳市  黄碧妃  葛宏力  黄炎和
作者单位:福建农林大学资源与环境学院, 福州 350002
基金项目:国家自然科学基金项目(41907043)资助
摘    要:水分和温度会显著影响花岗岩红壤的力学状态,是崩岗发生和发展的两大驱动因素。以崩壁三个土层土壤:红土层、砂土层和碎屑层为研究对象,在15、25、40和60℃温度条件下对三个土层土壤的液塑限和结合水含量开展研究。结果表明:红土层的液限、塑限和塑性指数均高于砂土层和碎屑层,碎屑层土壤的液塑限最小。崩岗土壤的液塑限与细黏粒、有机质和氧化铁的含量呈线性正相关。温度从15℃升高至40℃时,三个土层土壤的液限和塑限均显著降低,同时土壤的结合水含量均降低。温度从40℃升高至60℃,红土层、碎屑层土壤塑限和红土层、砂土层土壤液限有所上升。温度对土壤结合水含量的影响规律与土壤液塑限的变化趋势一致。碎屑层土壤的液限接近饱和含水量,且液限随温度升高逐渐降低。在夏季高温多雨的情况下,碎屑层土壤最容易发生流动变形,可能是导致崩壁崩塌的主要原因之一。

关 键 词:崩岗  结合水  颗粒分布  液塑限
收稿时间:2020/7/30 0:00:00
修稿时间:2020/9/17 0:00:00

Effects of Temperature on Soil Atterberg Limit in Soil of Collapsing Gully Wall in the Hilly Granitic Region of South China
ZHANG Yue,ZHAO Dongfeng,ZHENG Qinmin,LIN Jinshi,JIANG Fangshi,HUANG Bifei,GE Hongli,HUANG Yanhe.Effects of Temperature on Soil Atterberg Limit in Soil of Collapsing Gully Wall in the Hilly Granitic Region of South China[J].Acta Pedologica Sinica,2022,59(1):118-128.
Authors:ZHANG Yue  ZHAO Dongfeng  ZHENG Qinmin  LIN Jinshi  JIANG Fangshi  HUANG Bifei  GE Hongli  HUANG Yanhe
Institution:College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Abstract:【Objective】Collapsing gully, one of the most serious soil erosion problems in the tropical and subtropical areas of South China, occurs mainly in the hilly red soil regions as triggered off by the interaction of runoff and gravity. A collapsing gully generally consists of five parts: an upper catchment, a collapsing wall, a colluvial deposit, a scour channel, and an alluvial fan.Stability of a collapsing gully wall determines the scale of the collapsing gully and the volume of the colluvial deposit. Rainfall and temperature not only determine weathering rate of soils, but also affect the mechanical state of granite red soils. Liquid and plastic limits are the most commonly tested mechanical indices. However, few studies have been reported about investigation of the effects of temperature on soil Atterberg limits in collapsing gullies.【Method】In this study, soil samples were collected from the three soil layers in a soil profile, i.e. red soil layer, sandy soil layer and detritus layer, of a typical collapsing gully located in Anxi County, Fujian Province. The soil profile was subdivided into three soil layers in the light of their colors and structures. Four levels of temperature(15, 25, 40 and 60℃) were set to investigate their effects on soil liquid and plastic limits and soil bound water content.【Result】The red soil layer was found to be the highest in soil liquid limit, plastic limit and plastic index and followed by the sandy soil layer and the detritus layer. Liquid and plastic limits positively and linearly related to contents of fine clay, organic matter and iron oxide. When temperature rose from 15℃ to 40℃, soil liquid and plastic limits in the three soil layers all decreased, as well as the soil bound water content. When temperature rose from 40℃ to 60℃, soil plastic limit increased in the red soil layer and the detritus layer, and soil liquid limit increased in the red soil layer and sandy soil layer. The effect of temperature on soil bound water content was consistent with the changes in soil liquid and plastic limits.【Conclusion】The soil liquid limit of the detritus layer is approximate to its saturated water content, and decreases gradually with the rising soil temperature. In the case of high temperature and heavy rain in summer in this region, flow deformation is the most likely to occur in the detritus layer, which might be one of the main reasons causing the collapse of a collapsing gully wall.
Keywords:Collapsing gully  Soil bound water  Soil particle size distribution  Liquid and plastic limits
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