江峻毅,陈卫兵,江浩,李仁杰,张振华,陈然

• 1:山东电力工程咨询院有限公司勘测事业部
• 2:合肥工业大学土木与水利工程学院

摘要(Abstract)：

【目的】库水位周期性波动会导致水库岸坡岩土体的强度降低,变形加剧,影响水库岸坡的稳定性。【方法】通过单轴压缩试验并结合CT扫描技术,研究江西铅山抽水蓄能电站运行期岸坡强风化花岗岩在多次浸泡-非浸泡循环后的弹性模量(E)、泊松比(v)及细观结构参数的演化规律,获得强风化花岗岩变形参数与细观结构参数之间的相关性;采用偏光显微镜观察强风化花岗岩经历多次浸泡-非浸泡循环后的细观结构变化,获取强风化花岗岩的结构变化特征,并结合变形参数和细观结构参数的演化规律探讨其演化机制。【结果】结果显示:第8次浸泡-非浸泡循环结束后,强风化花岗岩的弹性模量下降了50.34%,泊松比上升了41.85%;3个截面的投影孔隙率分别增加了20.34%、19.18%和16.29%,孔隙个数分别增加了52.99%、42.24%和30.59%。【结论】结果表明:(1)随着浸泡-非浸泡循环次数的增加,强风化花岗岩的弹性模量逐渐减小,泊松比逐渐增大,第8次浸泡-非浸泡循环作用结束后,变形参数变化幅度趋于缓慢;(2)投影孔隙率、孔隙个数伴随着浸泡-非浸泡循环次数增加逐渐增大,孔隙平均面积和孔隙分布维数逐渐减小,第8次浸泡-非浸泡循环作用结束后,细观结构参数变化幅度明显减小;(3)多次浸泡-非浸泡循环作用引起强风化花岗岩内部孔隙、裂隙的发育扩展,孔隙、裂隙数量增加,岩石内部细观结构变化导致变形参数劣化,降低了岩石抵抗变形的能力。

关键词(KeyWords)： 浸泡-非浸泡循环;强风化花岗岩;变形参数;细观结构;抽水蓄能电站;边坡;弹性模量;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51579063)

作者(Author): 江峻毅,陈卫兵,江浩,李仁杰,张振华,陈然

DOI: 10.13928/j.cnki.wrahe.2025.02.016

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