Study On The Development Characteristics And Management Measures Of The Collapse Of Li County In Wenchuan Earthquske Area

Road collapse,which occurs in Tonghua township,Li county,Sichuan province,The horizontal width of the road pile collapse was 600m,and the longitudinal length was 550m,and the collapse area was divided into five dangerous rocks and eight dangerous rocks.Critical rock area 1:170m wide and 80m high,with a face area of about 9488 m~2;Critical rock 2:85m wide,76m high,and the face area of the dangerous rock body is about 4481m~2;Zone 3:width 106m,height 12~28m,and the elevation area of the dangerous rock body is about 4013m~2;Zone 4:high 48m,62m wide,and the face area of the dangerous rock mass is about 2222m~2;Dangerous rock 5:height 32m,width65m,and the face area of the dangerous rock body is about 1420m~2.The lithology of the dangerous rocks is a thousand rocks and metamorphic sandstone,and the instability mode is falling and falling.The zone 1 and the zone 2 are basically stable,and the zone 3,4 and 5 are unstable.At the bottom of the landslide,there are 105 people and 317 national roads in tonghua village.Two of the villagers'houses have been damaged by rockfall.In the event of a massive collapse,the economic losses of at least 10 million yuan will be caused.Papers in the way of dangerous rock(collapse)as the research object,through field investigation and engineering geological mapping,find out the dangerous rock(collapse)area of landform,stratum lithology,structure,hydrogeological conditions,weather,hydrology and other natural environmental conditions.At the same time on the way of dangerous rock(collapse)was analyzed,and the formation of the characteristics and genetic mechanism and analysis and evaluation of dangerous rock mass stability and the development tendency,on this basis to determine and calculated the speed of rock fall,a rolling stone gathers momentum,jumping height and jumping distance movement dynamics key parameters.Through the dangerous rock(collapse)the understanding of the characteristics and the protection object,mizoguchi according to control-control-collapse prevention system and dangerous rock(collapse)the principle of comprehensive treatment,put forward the pertinent regulation project proposal,namely with passive Lan Dang is given priority to,supplemented by active prevention measures,recommended"qing wei+passive block stone net+active defend the net+anchor"the governance of engineering measures.