【摘要】 坝基岩体稳定性是水电站建设过程中至关重要的问题,而坝基岩体卸荷松弛现象对其稳定性具有极大的影响作用。因此加强坝基卸荷松弛特征及机制的研究具有重要的工程实际意义。本文以某水电站左岸坝基为研究对象,通过现场调查、勘探,在查明了坝基卸荷松弛特征、影响因素的基础上,结合地质分析及数值模拟方法对坝基松弛机制进行了研究,结果表明该水电站左岸坝基卸荷松弛现象是由爆破作用所产生的瞬时调整以及开挖之后出现的时效性应力调整两者共同作用所导致的,为该坝基的稳定性预测及评价提供了依据。更多还原

【Abstract】 The stability of the dam foundation rock mass is a crucial issue in the construction process of the hydropower station,and the unloading relaxation phenomenon of the dam foundation rock has a great influence on its stability. Therefore,it is of great engineering practical significance to strengthen the study of the unloading relaxation characteristics and the base mechanism of the dam foundation. In this paper,the dam foundation of the left bank of a hydropower station in China is taken as the research object. Based on the field investigation and exploration,the dam foundation relaxation mechanism is studied in detail based on the geological analysis and numerical simulation methods. The results show that the unloading relaxation phenomenon of the dam foundation on the left bank of the hydropower station is caused by the instantaneous adjustment caused by the blasting action and the time-dependent stress adjustment after the excavation. The combination of the two causes the stability prediction and evaluation of the dam foundation.更多还原