To ensure the safety of the superstructure rising from the slope rock wall， extensive studies on the stability of a high and steep slope in a karst area with complex geological conditions were car? ried out， with reference to the Changsha Xiangjiang happy city rose from a deep abandoned mining pit. In this study， considering the inherent spatial variability of rock and soil and the influence of karst cav? erns， slope stability is evaluated through both deterministic and reliability analysis. Firstly， the safety factor of the multi-step high slope with a non-circular sliding surface is calculated using the Morgen?stern-Price method. Then the probability analysis of the high steep stepped slope subjected to structur? al load is carried out considering spatial variability of the shear strength indices based on the random field theory. Additionally， the effect of the karst carven condition on the reliability of the high and steep slope is discussed. The results indicate that in the soil-rock dual structural slope without the ef? fect of the karst cavern， the sliding failure generally develops only in the upper soil mass with poor me? chanical properties. And the spatial variability has a significant impact on the failure probability of slopes， ignoring the variation leads to an overestimation of the failure probability. As for the karst cav? erns， the location and shape of the cave both significantly affect the slope stability. The closer the cave is to the steep free face， the greater the influence of the slope is. Generally speaking， circular caverns are more likely to cause slope instability and damage than square caverns.
