Assessment Stability & Prevention And Treatment Of Slope In Mian Ning Highway

Whether the highway slope is stability and measures of prevention and treatment reasonable is a problem that must be considered in highway design, construction and conveyance. Reasonably assesses stability and select reasonable measures of prevention and treatment are the most important. Thing. So, by analyzing its geological feature , puts forward that main influentially actors are slope high and angle, hydrology geology term, rock stratat form, rock Characteristic and soft construction plane etc. taking the example for slope in Mian Ning highway in the paper. There is seven types of failure which are collapse landslide fall slippery, toppling failure, turns and twists, peeling off and mistake fall. The landslide and collapse are the most serious influence highway in them. The landslide mainly scatter in K2+600~K11+000, K16+080~K25+000, K30+850~K34+800 and K50+600~K52+420, the most rock are soft rock such as mire rock, marl rock, plank form mire rock, the slope high are from 10 to 40 meters, the slope angle is beyond 60 degree . The collapse mainly scatter in K16+400~K18+900, K27+400~K30+235 and K36+940~K37+850, the mainly rock are soft rock, such as mire rock, Sand quality mire rock etc ,the slope high are from 15 to 20 meters or 35 to 40 meters ,the slope angle is from 60 to 82 degree . By limit equilibrium method, analyses and assesses the slope stability in this area. The result shows that the basic stability slopes which are 36 is the most , 43.9%, the following is not stability slopes which are 30, 36.6% and the least is stability slopes which are 16 , 19.5%. The instability slopes scatter in KO+000~K3 +000, K16+080~K24+200 and K29+960~K38+000 , the most rock are soft rock such as mure rock, Shale, the slope high are from 20 to 70 meters, the slope angle are from 36 to 82 degrees .The basic stability slopes scatter in K8+670~K16+080 and K50+500~K56+532 , the most rock are hard rock or inferior hard rocks such as white cloud rock, sandstone and limestone, the slope high are from 17 to 45 meters, the slope angle are from 40 to 68 degrees. The stability slopes' scatter in K3+000~K8+670, K24+200~K29+960, the most rocks are hard rock such as white cloud rock, sandstone , the slope high are from 20 to 35 meters ,the slope angle are from 30 to 62 degrees . At last, the author provides that the most measure of prevention and treatment in landslide is anti-sliding stake, the most measure is retaining wall in collapse , small landslides , Toppling failure and fall slippery ,turns and twists. The best measure is the dint frame anchor in small collapse. The most prevention and treatment measure are facing wall, arch framework protecting slopes, anchor man sprays and plant protection in peeling off, turns and twists and mistake fall.