青藏高原东部边缘地区滑坡发育的地貌学研究（以万县市豆芽棚滑坡为例）

Geomorphologic Studies on Landslide Developmnt In Boundary Area of East Qinghal-xizang Plateau(Taking Douyapeng landstide as a example,wanxian)

近年来，用极限平衡法确定的稳定边坡已趋于不稳定，滑坡的发育已经不仅仅是一个边坡的物质平衡问题了．本文以理论上处于稳定的豆芽棚滑坡为例，从区域地貌应力场、河谷地貌及城市地貌过程等几方面对其发育机制进行了综合分析，证实了大型滑坡的发育受控于地貌应力场的基本规律．运用提出的青藏高原旋转隆升模式比较合理地解释了青藏高原东部边缘地区地貌应力场的基本特征，为区域大型滑坡的研究奠定了基础；强调了城市地貌过程对山区城市边坡的影响；提出了山区城市滑坡治理必须坚持的基本原则．

Larger landslides,developing in the boundary area of east Qinghai-Xizang plateau,have a direet bearing on zonal geomorphologie stress field in some extent.This paper discusses the relationships between landslides and geomorpholgy based on field investigations and analyse in home taking Douyapeng landstode as a example.It is important to providc the spinning uphcaval model of Qingkaj-Xizang p ateau,whieh ean explain reasonlythe formation and distribution of zonal stress field of the boundary area of east or all Qinghai-Xizang plateau.Generally,main moving direetions of many large landslides are eonsistent with either main oriention or shearbelt of the stress field Douyapeng landslide belongs to a larger landslide with two slide planes(the up one andthe down one).The up one is made gy mankind engineering aetions,and the down one is eontrolled by the zon-al stress ficld. valuablly,NE29°30′, chieffy moving direction of the landshde,is consistent with basis of drillresrlts,it is sure that the landsliole, develping late Quaternary,is consist of loose soils or earth and has clearcreep strain. we study the interest inthe paper for mankind actions to trigger the landslids too,and eoneludethat slope excavation、slope load and rich underyrourd water are the basic features for urban geomorpholyicproeess to cvaluate.The administration measures must be therefore syntheiical ones with engineering manner、governing water and adminestering way,whieh also be the general prineiples for Mt.city unstable slope to beruled.