Research On Engineering Geology Division Of Lalingzaohuo Area Based On GIS

The research area of this paper is the Lalingzaohuo area,the natural conditions are very bad,the traffic is difficult,most of the areas belong to the plateau no-man's land,no communication signal,in a semi-closed state,the economic development in the area is backward.At present,there are not many research literatures on engineering geological conditions in the Lalingzaohuo area.In addition,the Laling stove fire area is rich in mineral resources,but the engineering geological environment factors such as topography,geotechnical structure and geological structure of the study area restrict the development of the mining area to a large extent.The investigation and zoning of the engineering geological conditions in the study area can correctly evaluate the suitability of the engineering geological environment in the study area,provide a basis for the design and construction of the project construction,and can also serve as the basis for other plans.This paper carried out a field geological survey,comprehensively analyzed the influencing factors of engineering geological environment quality in the study area,selected 8 types of iMPact factors,constructed an engineering geological evaluation index system,used expert scoring method,combined with AHP to determine weights,and used weighted average synthesis.The index model uses GIS technology to partition the engineering geology of the study area.The main results and understandings are:(1)The geomorphological types of the study area are mainly divided into southern mountainous landforms and northern plains.The southern part is a small-middle undulating middle and high mountainous area.The above-ground permafrost area is above 4200 m above sea level.The ice-edge geomorphology develops and the topography changes from south to north.It restricts the planning and development of related engineering activities such as overall mineral development;magmatic rocks and metamorphic rocks are widely distributed,clastic rocks and carbonate rocks are scattered in the piedmont area;the plain area is mainly the Quaternary rush-alluvial Deposits,slopes in the piedmont,and the upper part of the alluvial plain cover the aeolian sand layer;the geological structures such as folds and structures are developed,and the basic seismic intensity is ???;the aquifer in the area is poor in water and the groundwater is lacking;Geological disasters such as flow,frozen soil freezing,salinization,and desertification are developed,and have a great iMPact on the engineering geological environment.(2)Screening 8 types of factors affecting the quality of engineering geological environment,including undulation,terrain slope,engineering geological rock group,geological structure,seismic activity,hydrogeology,collapse and mud disaster,frozen soil freezing and thawing,etc.The evaluation index system based on the hierarchical structure model uses the expert scoring method combined with the analytic hierarchy process to calculate and determine the weight of each participating factor.The weight of the undulation and the slope of the terrain is relatively large,followed by the higher weight of the engineering geological rock group and the geological disaster,the relatively lower weight of the geological structure and seismic activity,and the smallest hydrogeology.(3)Grid element is used to quantify and classify each factor;based on GIS overlay analysis,the weighted average comprehensive index model is used to classify the suitability of engineering geological environment for engineering construction activities in the study area,which is suitable and suitable.Poor suitability and not suitable for 4 grades.(4)According to the comprehensive influence of topography,engineering geological rock group,geological structure,seismic activity,hydrogeology and geological disasters on the engineering geological environment of the study area,the engineering area of the study area is divided by GIS,and the area is divided into suitable areas(?),suitable area(?),poor suitability(?),and unsuitable(?)4 areas.(5)A comprehensive evaluation of the four sub-areas of the study area,the engineering geological characteristics of the four areas are as follows:suitable area(?): It is the south of the Geji Highway(S303),the lower reaches of the river,and the front area of the alluvial plain.The area is flat,the site is stable,the geological disaster is not developed,and the engineering geological conditions are good,which is suitable for engineering construction.Suitable area(?): In the piedmont plain,the middle and lower reaches of the river,the terrain is relatively flat,sloped from south to north,the slope is 10~20°,the seismic intensity is VI degree,the geological disaster is weak,and the engineering geological conditions are better,which is more suitable for engineering.activity;poor suitability(?): The southern margin of the Kunlun Mountains is overextended to the basin.The area belongs to the middle and high mountains.The terrain is gradually slowed down,the tectonic development,the seismic intensity is VI,the geological disasters are developed,the rock mass is broken,the site stability is poor,and the engineering geological conditions are poor.,the construction of engineering activities is poor;not suitable(?): In the high mountain area above 4200 m above sea level,the terrain of this area is undulating,the tectonic activity is relatively strong,the seismic intensity is ??? degree,the disasters such as freezing and thawing,collapse and slipstream are developed,the site is unstable,the engineering geological conditions are poor,and it is not suitable for related engineering construction.(6)In this paper,25 results maps are drawn,including 2 meteorological and hydrological distribution maps,3 topographic maps,2 stratigraphic lithology maps and 2 geological rock formation maps,3 geological structures and ground motion peak acceleration maps,hydrogeology.Figure 1 Zhang.There are 3 maps of geological disasters,8 maps of engineering geological conditions of each evaluation factor,1 map of engineering geological environment,1 map of engineering geological division,and 1 section of section.