| Assessment of rock slope stability is an important question which is not avoid and very influential in highway construction Therefore, the author analyses and assesses stability of the rock slopes in the area making use of methods of engineering geology, rock mechanics and engineering mathematics etc ,taking the research object for the rock slopes in Mian Ning highway in this paper.After detailed researching the engineering geological condition of the rock slopes in Mian Ning highway, the author performes the engineering geological zoning for thearea .The author analyses sensitivity of factors influencing the rock slopes in Mian Ning highway, concludes that slope height is the best sensitive to slope stability .By analysing the 34 in 82 team returning value outside rock in contrast to the indoors experiments, firstly establishes related equation of the returning value and the strength of rock in the area .By minimum two multiplication, evaluates the slope quantity of rock mass and concludes that the fifth degree quantity of rock mass is most in the area according to the data of indoors experiments . According to rock characteristic, discontinuous structure and rock weathered degree , divides the 8 kind types of slope deformation and failure which are collapse, parallel failure, toppling failure ,and cicular failure, fall slippery , anomaly ,avalanche and analyses their mechanism broken and formation term ,.concludes that the stability coefficient of deflection failure and the critical length of the slope is approximation straight line relation. By limit equilibrium method , theory of rock mass, dependable degree method and engineering geology method, assesses the slopes stability and concludes that the basic stability slopes are main , 42%, following are not stability slopes ,33% and stability slopes ,25% in this area. According to engineering geology characteristic of slopes and the evaluation result of the stability, provides the measures of prevention and treatment of slope . ...
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