陕北子长县阎家沟黄土滑坡特征及其变形机制

Deformation Mechanism and Characteristics of Yanjiagou Landslide in Zichang County,Northern Shaanxi

野外调查和钻探资料显示,阎家沟滑坡属大型黄土滑坡,滑坡体为中、晚更新世黄土。在滑坡前缘流水侵蚀坡脚和滑坡体上修建窑洞、梯田、排放生活用水等人类工程活动影响下以及在2002年7月4日连续强降雨的激发下,目前处于不稳定状态,若遇强降雨失稳概率很大。填埋滑坡体裂隙和孔洞、加强地表排水、在滑坡体前缘沟谷修建淤地坝是提高陕北此类滑坡稳定性最为经济有效的措施。

Data of field survey and drilling show that Yanjiagou landslide is a large scale loess landslide. The main part of landslide formed of loess of late Pleistocene and middle Pleistocene. Due to flow erosion at the lower slope, caves, terraces and drainage works built on the landslide mass and a heavy rainstorm on July 4, 2002, the landslide is instable at present. If it encounters a strong rainfall, it would lose its stability. Filling cracks and holes of landslide, strengthening surface drainage and building warping dam are the most economical and effective measure to enhance the stability of landslide, like Yanjiagou landslide in northern Shaanxi.