摘要
为了探究崩岗崩壁土壤界限含水率特征,采集长汀崩岗崩壁7个不同深度土层土壤样品研究了液塑限特征及其影响因子。研究结果表明,随着土层深度的增加,土壤液限、塑限以及缩限逐渐减小;界限含水率受土壤粒径分布与有机质含量的共同影响,随着黏粒含量与有机质含量的增加,土壤液限、塑限以及缩限变大,并且黏粒含量对界限含水率的影响最为明显,呈极显著的相关关系。土壤界限含水率与崩岗侵蚀发育密切相关,A、B层较高的液塑限值使得水分运移过程中土层重量增加,剪切力增大,坡力稳定性降低,C层液塑限值较低,容易在水分下渗产生流失,进而发生崩塌。A层和B层的缩限特征导致土壤容易形成裂隙,产生优先流,加剧崩岗的发育。研究结果为崩岗侵蚀机理研究及其治理提供理论依据。
In order to explore soil atterberg limits characteristics of collapsing wall,the characteristics of liquid plastic limit and their influencing factors were studied by 7 soil samples from Changting.The results showed that,with the increasing soil depth,the soil liquid limit,plastic limit and shrinkage limit decreased gradually.The limit moisture content was affected by soil particle size distribution and organic matter content.With the increase of clay content and soil organic matter content,liquid limit,plastic limit and shrinkage limit would be larger.The influence of clay content on limit moisture content was most obvious,and it had a significant correlation.At the same time,the water ratio limit was closely related to erosion development of slope collapse.The higher liquid plasticizing limit of A and B layers would increase the soil weight during water movement.The shear stress increased,the slope stability would reduce.When the liquid plastic limit of C layer was low,it would occur water infiltration and collapse easily.The results provided a theoretical basis for the study and treatment of collapse erosion.
出处
《人民珠江》
2017年第12期96-99,108,共5页
Pearl River
关键词
崩岗
崩壁
界限含水率
土壤理化性质
影响因子
slope collapse
collapsing wall
atterberg limits
soil physicochemical properties
influencing factors
