抽水蓄能电站蚀变岩原位直剪试验研究

In-Situ Direct Shear Test Study on Altered Rock in Pumped Storage Hydropower Station

摘要: 工程区蚀变岩的存在将直接影响到抽水蓄能电站的设计，考虑到强蚀变岩自身强度特征难以取到原状式样，故文章以某抽水蓄能电站为工程背景，通过原位大型直接剪切试验探究不同蚀变程度的岩土体在天然和饱和两种状态下抗剪强度的变化。研究结果表明，弱蚀变、天然状态下试样的抗剪性能要明显强于强蚀变、饱和状态下的抗剪性能；达到峰值剪切强度后曲线下降速率普遍较慢，试样表现出一定的塑性特征；蚀变程度的加深要明显强于试样饱和对抗剪强度劣化的影响。

Abstract: The existence of altered rocks in the project area will directly affect the design of the pumped storage hydropower station. Considering that strongly altered rock is difficult to obtain in its original state, this paper takes a pumped storage hydropower station as the engineering background and explores the changes in the shear strength of rock and soil bodies with different degrees of alteration in natural and saturated states through in-situ large-scale direct shear tests. The research results show that the shear performance of samples in weakly altered and natural states is significantly stronger than that in strongly altered and saturated states; the rate of decline of the curve after the peak shear strength is generally slow, and the samples show certain plastic characteristics; the deepening of the alteration degree is significantly stronger than the effect of saturation sample on the decline of shear strength.