为了评估淤地坝建设对流域斜坡稳定性的影响,该文基于地理信息系统(GIS)的斜坡稳定性模型(SINMAP),根据实测的土力学参数和野外滑坡与崩塌分布点调查,分析了淤地坝淤积至不同高度时的斜坡稳定性.研究发现,随着流域淤地坝系淤积高度的增加,流域极不稳定区域逐渐减少,而极稳定性区域逐渐增加.随着淤积高度的增加,陡坡区域(坡度＞45°)所占比例逐步减少,且与极不稳定性区域的减少呈线性相关.该文总结了淤地坝淤积过程中的“淹没效应”,泥沙的淤积,不仅改变了流域坡度组成、缩短了坡长,而且改变了流域的土地利用等因子.该研究可为淤地坝建设提供参考.%To evaluate the effects of check dams on slope stability, slope stability model based on GIS was adopted in this study. According to the measured soil mechanics parameters and the data of field survey to landslide sites, the slope stability with the check dam deposited to different siltation heights were analyzed. The results showed that the defended slope zone was decreased and the stable slope zone was increased with the increasing of the siltation heights of check dams. The percentage of steep slope area (≥45°) was decreased with the increasing of the siltation heights, and exhibited a linear relationship with the defended slope zone. The "flooding effect" was summarized in the deposition process of check dams. Sediment deposition not only changed the valley slope constitution and shortened the slope length, but also changed the cover-manegement factors and support practice factors. The study provides a reference for check dams building.
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