摘 要 岩质边坡稳定性评价是公路修建中影响很大而又不可避免的一个重要问题。因此，本文以勉宁高速公路岩质边坡为研究对象，利用工程地质学、岩体力学和工程数学等方法对沿线岩质边坡的稳定性进行分析与评价。 通过研究勉宁高速公路岩质边坡岩体工程地质条件，对沿线进行了工程地质分区。分析了影响勉宁高速公路岩质边坡稳定性因素的敏感性，得出了坡高对该区的边坡稳定性最为敏感。从野外82组回弹值中选取了其中34组回弹值与室内抗压强度试验结果进行对比分析，利用最小二乘法，首次建立了该区岩石回弹值与岩石强度的相关方程。根据室内试验资料，利用RMM法评价了边坡岩体质量，得出沿线边坡岩体质量以Ⅴ级为主。根据勉宁高速公路岩质边坡的岩性特征、岩石风化程度及不连续结构面的特性等，将沿线岩质边坡的变形破坏类型分为8种即：崩塌、平移滑动、倾倒、溃屈、圆弧滑动、塌滑、错落和剥落，分析了这8种变形破坏类型的破坏机制和形成条件，并得到了溃屈破坏的稳定系数与边坡临界长度成近似直线关系。利用极限平衡法、块体理论、可靠度法和工程地质类比法对边坡的稳定性进行了评价，结果表明：该区边坡以基本稳定边坡为主，占42%，不稳定边坡次之，占33%，稳定边坡最少，占25%。依据边坡的工程地质特征以及稳定性评价结果，对该区边坡的防治提出了建议。

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 .