水文地质工程地质2024，Vol.51Issue(3)：1-11,11.DOI:10.16030/j.cnki.issn.1000-3665.202403039
黄土-古土壤互层对土壤水分运移及土体微结构的影响
Effects of loess-paleosol interbedding on soil moisture transport and soil microstructure
摘要
Abstract
Geological disaster occurrences in loess regions are intrinsically linked to water infiltration in loess,with the Malan loess-paleosol interlayer structure significantly influencing the infiltration patterns of soil moisture.This research was carried out to reveal the moisture migration characteristics in loess-paleosol interlayers,and to investigate the influence of the moisture migration on the microstructure of loess,providing a theoretical basis for engineering practice and scientific research in loess areas.In this study,we focused on the loess of the South Plateau in Jingyang County,Shaanxi Province,and conducted water infiltration tests using a soil column model to investigate the soil moisture transport dynamics under loess-paleosol interlayer conditions.Subsequently,we analyzed the impact of soil moisture transport on the loess micro structure under these conditions through microstructural testing,and calculation of fractal dimension and probability entropy.The findings revealed that the permeability of the paleosol layer was low,causing transient water stagnation when the wetting front reached the loess-paleosol interface.The stagnant water at the interface of loess and paleosol under the influence of the paleosol layer will lead to the interconnection of pore structure,and the pore space will increase by 4.13％on average,and the analysis of the indexes of fractal dimension and probability entropy shows that the probability entropy of the pore direction decreases by 0.029 on average,and the fractal dimension decreases by 0.076 on average,i.e.,the water-blocking effect of the paleosol layer makes the pore space of the loess at the interface increase,the pores are arranged in an orderly manner,and the pore morphology is regular.The results of the study provide scientific support for the engineering construction and eco-environmental protection in loess areas.关键词
黄土/古土壤/土柱试验/水分入渗/微观结构Key words
loess/paleosol/soil column test/water infiltration/microstructure分类
天文与地球科学引用本文复制引用
李培月,李佳慧,吴健华,王远航,陈银富..黄土-古土壤互层对土壤水分运移及土体微结构的影响[J].水文地质工程地质,2024,51(3):1-11,11.基金项目
国家自然科学基金项目(42272302 （）
42072286 （）
42090053) （）
国家重点研发计划项目(2023YFC3706901) （2023YFC3706901）
