The strength of highly weathered rock slope is very weak due to engineering disturbance and rainfall ,so slope failure usually occurs in highly weathered rock slope mass during highway construction .In previous research slope design is often based on a certain state which cannot reflect the evolution process of rock mass strength under the influence of en-gineering disturbance and rainfall .In this paper the strength of rock mass at different stages is analyzed by back-analysis method ,and the results of active and passive reinforcement for a highway engineering slope are compared and analyzed . The results show that active reinforcement design can effectively utilize the original rock mass strength ,thus greatly re-duce the amount of reinforcement works .%全强风化岩质边坡由于岩体破碎,易受工程扰动和降雨影响而导致强度发生弱化,因此在公路路基开挖过程中极易失稳.以某公路全强风化岩质边坡为例,通过对处于不同阶段的边坡稳定性进行反分析,分别得到岩体初始强度和弱化后强度,获取了岩体强度的演化过程.通过主动加固和被动加固工程措施的对比分析,表明主动加固设计能够有效利用岩体原始强度,大大降低加固工程量.对于受工程扰动和降雨影响较大的全强风化岩质边坡,采用主动加固设计十分必要且有效,可为全强风化岩质边坡设计提供参考.
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