Effects of loess-paleosol interbedding on soil moisture transport and soil microstructure
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摘要:
黄土地区地质灾害问题的发生大多与水在黄土中的入渗有关，而马兰黄土-古土壤互层结构对土壤水分入渗规律的影响显著。为揭示古土壤阻滞作用下黄土水分运移规律及其对黄土体微结构的影响，为黄土地区工程实践提供理论基础，该研究以陕西省泾阳县南塬的黄土为研究对象，采用土柱模型进行水分入渗试验，研究黄土-古土壤互层条件下土壤水分运移规律。在此基础上，通过微结构测试、分形维数和概率熵等指标的计算，分析黄土-古土壤互层条件下土壤水分运移对黄土微结构的影响。结果表明：古土壤层的透水性弱，湿润锋抵达黄土与古土壤界面处产生瞬态滞水，且随着入渗强度增加滞水时间增加；古土壤层影响下黄土与古土壤界面处的滞水会导致孔隙结构相互连通，孔隙空间平均增加4.13%，孔隙方向概率熵平均减少0.029，分形维数平均减小0.076，即古土壤层的阻水作用使得界面处黄土的孔隙空间增大，孔隙排列有序，孔隙形态规则。研究结果为黄土地区的工程建设和生态环境保护提供科学支撑。
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 microstructure 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.
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Key words:
- loess /
- paleosol /
- soil column test /
- water infiltration /
- microstructure
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表 1 室内土柱渗水试验方案
Table 1. Scenarios of seepage test using soil columns
试验
编号土柱类型 入渗速率
/（mL·min−1）渗水
时长/h入渗强度
/（mm·d−1）1 L1 1 8.0 18 L1—S1 2 L1 2 4.0 36 L1—S1 3 L1 3 2.8 55 L1—S1 4 L1 5 1.7 92 L1—S1 
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表 2 渗透前后黄土试样的孔隙方向概率熵
Table 2. Probability entropy of pore direction of loess specimens before and after infiltration
试验样品 初始试样 1 2 3 4 L1 L1—S1 L1 L1—S1 L1 L1—S1 L1 L1—S1 概率熵 0.785 0.899 0.878 0.918 0.861 0.909 0.883 0.954 0.944
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表 3 渗透前后黄土试样的孔隙分形维数
Table 3. Pore fractal dimension of loess specimens before and after infiltration
试验样品 拟合方程 孔隙分形维数 初始试样 lgA = 0.843lgL − 0.128 1.686 1 L1 lgA = 0.814lgL − 0.098 1.628 L1—S1 lgA = 0.807lgL − 0.069 1.614 2 L1 lgA = 0.894lgL − 0.526 1.788 L1—S1 lgA = 0.810lgL − 0.047 1.620 3 L1 lgA = 0.860lgL − 0.133 1.720 L1—S1 lgA = 0.820lgL − 0.343 1.640 4 L1 lgA = 0.901lgL − 0.314 1.802 L1—S1 lgA = 0.880lgL − 0.125 1.760
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