Analysis Of The Types, Morphological Characteristics And Formation Mechanism Of Geological Disasters In Meiling

Meiling, located in the northwestern suburbs of Nanchang and 15 km from the urban area,is a famous national scenic area which is also called the garden of Nanchang city. Artificial activities here are very active. The landform type of it is low mountain and hilly terrain,and the precipitation is abundant. In recent years, landslide, collapse and other geological disasters happen frequently, which seriously threaten the ecological environment and the life and property safety of the scenic area. In this paper, through the study of the types,characteristics and formation mechanism of geological hazards in this area, this paper provides reference for the protection of tourism development as well as disaster prevention and mitigation.In this paper, for the study of geological disasters of Meiling, the author first analyzes the forming factors of various geological disasters from the angle of landform factors.Then the author collects slope and landslide samples to analyze particle size and moisture content, etc., and finally to explore its internal genesis. Understanding drawn as follows:1, More than 90% of the Meiling covers with hilly landscape. With Gully Development and fragile geological environment, there happens geological disasters frequently,including landslides, avalanches, dangerous rock and flash floods. From April to June is the peak period of geological disasters, mainly in the strong human engineering activities hilly area nearby settlements built on both sides of the road along the valley and along the highway or distribution. Affected by topography, lithology and structural constraints, the persistent rain or rainstorm as well as irrational human activities are the main predisposing factors of geological disasters.2, In Meiling Yi Fu Ping Niu Ling Cun Wei Jia and ban Ling Chen Jia landslides, the hazards of landslide is body of soil. Formed by strongly weathered layer of the granodiorite and eluvial sand composition, the soil is loose in structure and low in cohesion.Persistent and heavy precipitation will accumulate sand infiltration along the residual slope slopes, soften the soil with full water in the soil, reduce soil adhesion, and finally induce landslides occurrence. Landslides in these two areas have great harm hazard and high cost of governance, so we should use the measurement of village relocation. Mini-landslide coarse sand to the main portion of the sliding surface values and moisture content than the density of the corresponding point of the sliding surface of the lower portion of the soil ishigh, compared with the lower face of the sliding surface of the sliding portion is not easy to water seepage.3, Small collapse bodies mainly include coarse sand, especially gravel, and the structure is broken. Artificial cut slope and precipitation are the main predisposing factors of collapse occurrence. On the Slope, water content and dry density show overall linear distribution. From top to bottom, the rate of water shows a decreasing trend, while the dry density is gradually increasing. Water content and dry density well fitted and they are significantly negatively correlated.4, After the cutting damage caused by tectonic movements, post weathering, water and other physical and chemical action make granite show different degrees of weathering.Down rubble-like crags, strongly or moderately weathered, are poor bedding, loose, messy,multi-gap. Spheroidal weathering dangerous rocks are strong weathered granite, burst on the scene because of artificial slope cut, the precipitation washes away of fine particles of soil on slopes, causing Spheroidal weathering dangerous rocks to float as dangerous rocks.5, Flash floods mainly occurred in the rainy season from April to June. High-intensity rainfall is main factor to inspire flash floods. Other factors include vegetation destruction as a result of artificial construction in the mountain, new catchment areas like highways,and the underlying granitic bedrock whose tight texture is not conducive to water infiltration. The outbreak of flash floods is a comprehensive result of all those factors.