ANALYSIS OF WATER MOVEMENT LAW IN SHALLOW LOESS SLOPE BASED ON IN-SITU MONITORING
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摘要:
降雨诱发的浅层黄土滑坡是黄土高原重要的地质灾害类型之一.斜坡水分空间分布和变化趋势是导致斜坡失稳的重要因素，但基于此的剖面监测数据较少.依托延安黄土地质灾害野外观测基地，选择典型黄土斜坡，在坡面布设两条5 m深的水分探测纵剖面，观测在降雨过程中斜坡水分的空间特征.监测结果显示：1）降雨引起的土壤含水率变化深度有限，与降雨量成正相关关系；2）土壤含水率随时间变化表现出周期性特征，随深度增加，周期逐渐变长；3）斜坡水分在空间分布上存在明显的各向异性——垂向上表现为含水率的不均匀性与阶段性，而在斜坡的不同部位，受降雨影响坡顶-坡腰-坡脚含水率大致呈递减趋势，其中坡顶、坡脚的水分波动程度最大，坡脚的入渗深度最大.
Abstract:Rainfall-induced shallow loess landslide is one of the major geohazards in Loess Plateau. The spatial distribution and variation trend of moisture in slope are important factors leading to slope instability, but there are few section monitoring data based on the above factors. Relying on the loess geological hazards field observation base in Yan'an City, the study selects a typical loess slope to lay out two 5-meter-deep vertical sections for moisture detection, and observes the spatial characteristics of slope moisture during rainfall. The monitoring results indicate that the variation of rainfall-induced soil moisture content is limited to depth and positively correlated with rainfall; The soil moisture content shows periodicity with time and the period gradually lengthens with increasing depth; The slope moisture shows obvious anisotropy in spatial distribution, uneven and periodic vertically, while the water content in slope top, midslope and slope toe generally show a decreasing trend under the influence of rainfall, among which the water content fluctuates the most at the top and foot of slope, with the largest infiltration depth at the slope toe.
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Key words:
- loess landslide /
- rainfall /
- infiltration depth /
- water content /
- anisotropy
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