关键词: 岩土稳定性, 冲淤变动型泥石流, 松散土体, 物源

Abstract: The authors discuss roundly source of loose earth for impact deposit debris flow to develop taking pingchuan debris flow,one of the quite typical impact deposit debris flows in southwest sichuan province,as an example in this paper. on the basis of detailed investigations in situ,geotechnial testing in Lab and theory analysis,all results indicate obviously that moderate and bulky loose earth in giant debris flow situating in southwest sichuan mountainous area are main institute,whose tribulation are consistent with landforms.Loose earth locating in mid forepart catchment are quite unstable,so often becomes main source of loose earth of debris flow.Formation of loose earth is controlled principally by geologic and geotechnical environment while human actions is the secondary factor for loose earth to form.In many times,human actions provide loose earth through loose earth stability.

Key words: geotechnical stability, impact deposit debris flow, loose earth, source