ANALYSIS ON DEVELOPED CHARACTERISTICS AND DISASTER LAWS OF LARGE-MEDIUM LANDSLIDES IN THE HAIHE RIVER BASIN

The Haihe River using Qionghai Lake as the coresurrounds beautiful Xichang City. Due to the limit of the geological environment conditions, there are many geological disastersin the basin. On the basic of high precision geological disastersinvestigationin mapsheet, we found that there are many large-medium landslides which volume is more than 105m3 and often resulted in serious disasters. Basing on case, the paperanalyzesdeveloping characteristics of,summarizes the main form and disaster laws of large-medium landslide in Haihe River Basin. The results show that:(1) Large-medium landslides inHaihe River Basindistributed mainly in Panxi red bed region. The petrographic characters influence failure mode of large-medium landslides inHaihe River Basin.(2) Thefault plane and fault-induced cleavage planes lay a foundation for landslide.it controls slippage of large-medium landslides inHaihe River Basin.(3) Large-medium landslides inHaihe River Basin induced by multiple-factor coupling such as rainfall, flood, earthquake.(4) Affected by human engineering activity, the disaster laws of large-medium landslide in Haihe River Basinis that direct damage is little and indirect effect is great, chain effect is marked.