Marl as a swelling, water softening special soft rock, its engineering characteristics decline in approximately negative exponential with its increase of disintegration and dissolution volume. Thus, adequate attention should be paid to rapid softening problems caused by precipitation and air humidity when excavation carried out in humid rocky high slope region with great difference of temperature and precipitation.Based on example of the north-west of a large power plant cooling tower marl excavation slope, this paper exploratively proposed the excavation slope stability analysis method and its excavation support precaution applicable in humid quick-softening Marl high slope region, especially detailed in the determination of calculation parameters values and analysis of slope failure mode and other excacation support and monitor methods.%泥灰岩作为一种吸水膨胀、遇水软化崩解的特殊软质岩石，其工程强度随溶蚀体积的增长近似呈负指数规律下降，故在温差和降水量较大的湿润区进行泥灰岩类高边坡开挖，应重视由降水量和空气湿度引起岩石的快速软化问题。本文以某火力发电厂冷却塔北东侧大型泥灰岩开挖边坡为例，提出一种湿润区遇水急剧软化的软质岩石开挖边坡稳定性评价方法及其施工开挖支护注意事项，尤其在边坡失稳模式分析和计算参数取值方面进行了较为深入的探索性论述。
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