REVIVIFICATION MECHANISM OFANCIENT LANDSLIDES IN XIAONANGOU BASIN, YAN'AN

摘要

Yan' an, Shaanxi Province is located in the mid- dle reaches of the Yellow River. Its unique landform and fragile ecological environment lead to frequent landslide disasters. Due to the shortage of land re-sources in the city, people developed a large number of basins in the expansion of urban space, inducing the revivification of many ancient landslides. Since ancient landslide revivification poses a threat to soil and water conservation, ecological environment, en-gineering construction, human settlements and prop- erty safety, it is very important to study the resurrec- tion mechanism. This paper uses such methods as ge- ological survey, geological mapping and geotech- nical exploration to obtain the ancient landslide boundaries, stratigraphic lithology and basin DEM, and finds on this basis that the water content in the ancient landslide and the soil shear strength increasewith depth, and the soil shear strength near the slid- ing plane decreases to a certain extent. The pro- cessing of remote sensing data of vegetation in thestudy area and the long-term monitoring of sedimen- tation and rainfall in the field show that rainfall af- fects the coverage of vegetation, and the revivifica-tion degree of ancient landslides is different due to different vegetation coverage. Finally, according to the revivification factors of ancient landslides in the basin and the results of laboratory tests, the author puts forward the revivification mechanism of ancientlandslides in the basin. This paper can offer a viewon how to deal with ancient landslide revivification from the perspective of basins.