Study On Geological Hazards In Dali City,Yunnan Province

Dali city has strong neotectonic movement,many geological structures,high mountains and deep valleys,well-developed river system,and frequent human activities,which have greatly deteriorated the fragile geological ecological environment and caused frequent geological disasters.Geological hazards have seriously restricted the development of national economy and social prosperity and stability of Dali City.Therefore,this article on the basis of system analysis and research all kinds of data,data,combined with the conditions of the Dali geological disaster of the Dali types,spatial distribution of the geological disasters,the systemic research on the formation law of sandstrom,division of geological hazard liability and its forming reason was analyzed,and then draw the following conclusion:1.There are many types of geological disasters in Dali city,including landslide,collapse,debris flow and ground collapse,and landslide and debris flow are the main ones.2.The development of geological disasters in Dali City has obvious rules: large and medium-sized fault zones or fault intersection,landslide disaster points are dense;Colloids tend to occur in the special soft-hard rock assemblage formed by the hard rock strata at the upper part and the soft rock strata at the lower part.Near the active fault zone,the broken rock provides the source of debris flow.3.The occurrence and development of geological hazards in Dali City are affected by many factors.Terrain and landform(elevation,landform and slope),engineering rock group,geological structure and neotectonic movement affect the formation of geological hazards,while rainfall and human activities as inducing factors affect the occurrence of geological hazards.4.According to the classification principle of geological hazard susceptibility,the analytic hierarchy process(AHP)is used to select the evaluation factors,calculate the weight coefficient,and superposition the qualitative analysis method to divide the geological hazard susceptibility of Dali City into four areas and nine sub-areas.5.The occurrence and development of geological hazards in Dali City are closely related to tectonic activities.Most of the geological disasters in this area occur in the position where the fault structures are strongly developed.Meanwhile,the frequent occurrence of neotectonic movement and earthquakes further promote the development of geological disasters.6.In the process of prevention and control of geological disasters in Dali city,it is suggested to carry out further investigation on the geological disaster sites and surrounding areas,study the geological conditions of geological disaster sites and surrounding areas in detail,and make different prevention and control plans according to local conditions.