Study On The Law Of Development And Formation Mechanism Of Landslides In Hilly Region Of Henan Province

The mountainous and hilly regions of Henan Province are located in the western,northern and southern parts of Henan Province.The geological conditions are complex.It is the most developed landslide in Henan Province,which poses a huge threat to the life and property safety of the people and seriously restricts the sustainable development of the local economy.development of.This article relied on the "Geological disasters detailed analysis and comprehensive research project of 1:50000 geological disasters in Henan Province-geological disasters analysis and evaluation and zoning" geological survey project,through a large number of field surveys and indoor data processing,research work,and achieved the following results:1.A total of 2637 landslides in the study area were identified,and the development characteristics such as landslide scale,mechanical mechanism,plane and profile morphology were summarized.It was found that the size of landslides in the study area was mainly small,accounting for 90.1% of the total;the mechanical mechanism was towed Landslides account for 68% of the total;large-scale and extra-large landslides are mainly distributed in Xinxiang City,Sanmenxia City,and Xinyang City;landslides are mainly distributed in loess hilly regions;landslides are mainly semi-circular and tongue-type,accounting for The total landslides were 38% and 27%;the profiles were mainly convex and stepped,accounting for 30% and 26% of the total.The landslide stability,disaster conditions and dangers have been summarized.2.The distribution pattern of landslides in administrative units and geographical units was summarized.The administrative units were mainly Sanmenxia City,Luoyang City,Nanyang City,and Xinyang City,which accounted for 80.5% of the total;the geographical units were in the middle and low hills and hills of western Henan and Loess hilly areas dominate,accounting for 47.2% and 29.5% of the total.The landslides in the study area were divided into three major categories and eight sub-categories based on material composition,geological structure,and hazard factors.Four major geographic units were explored from the perspectives of development type,slope structure,landslide thickness,slope type,and slope gradient.Landslide development characteristics.3.Analyze the relationship between landforms and landslides from the perspective of macro and micro-geomorphology,and obtain the number of landslides controlled by macro-geomorphology,revealing the restrictive effects of slope topography,slope height,slope,etc.,on the occurrence of landslides.The micro-geomorphic conditions of landslides in the region;the impact of faults on the distribution and development characteristics of landslides in the study area;the determination of faults and other geological structures as the main controlling factors for the development of landslides;and the combination of the fractures in the study area;The distribution of stratigraphic lithology is briefly described,and the easy-slip strata in the region are determined,and the slope structures in the region are divided into five major categories;water factors such as groundwater types,rivers and other surface water systems and rainfall reveal different types of water factors.One of the inducing factors of landslides,combined with human engineering activities in the area,explored the inducing effects of human activities such as slope top loading and slope foot excavation,reservoir water resources reform,and road engineering on landslides.4.Through a combination of numerical simulation and theoretical analysis,the formation mechanism of typical landslides in the study area was studied,and the genesis model maps for each type of landslide were generalized,and the landslides in the study area were divided into creep-stripping and weakness.Controlled-creep general sliding type,saturated belt control-creep-pull type,compression-induced splitting+slip-pulling composite type,slip-pulling overall sliding type,slip-pulling and disintegration type mechanism.5.Finally,the development laws and genesis models of landslides in different geographic units in the study area are summarized.