库水升降速率对老蛇窝滑坡稳定性影响分析

摘要

通过监测资料分析和滑坡稳定性数值计算,探讨了三峡库水位在不同升降速率下对老蛇窝滑坡稳定性的影响规律.研究结果表明,理论上库水位上升有利于老蛇窝滑坡的稳定,但实际运行中库水位上升是不利于滑坡稳定的,因为库水浸泡会使滑坡前缘塌岸;老蛇窝滑坡为动水压力型滑坡,最主要诱发因素为库水位的下(骤)降;老蛇窝滑坡稳定性的临界库水位调度速率为0.9 m/d,即当库水位下降速率大于0.9 m/d时,滑坡K值小于1.%Based on monitoring data analysis and landslide stability numerical calculation, we discussed the influence of different water level fluctuating rates of Three Gorges Reservoir on Laoshewo Landslide stability.The results show that the reservoir water level rising is conducive to Laoshewo Landslide stability in theory, however it has negative impact on the landslide stability in practical for the landslide edge immersed in reservoir water would be softened;Laoshewo landslide is a dynamic water pressure type and its main inducing factor is water level dropping;the critical water level dropping rate for Laoshewo Landslide stability is 0.9 m/d, which means that when the water level dropping rate is greater than 0.9 m/d, K of the landslide is smaller than 1.