抽水蓄能电站运行期岸坡强风化花岗岩变形参数演化机制  

Evolution mechanism of deformation parameters of strongly weathered granite on the bank slope during the operation period of pumped storage power stations

作　　者：江峻毅 陈卫兵[1] 江浩[1] 李仁杰[1] 张振华[2] 陈然 JIANG Junyi;CHEN Weibing;JIANG Hao;LI Renjie;ZHANG Zhenhua;CHEN Ran(Shandong Electric Power Engineering Consulting Institute Co.,Ltd.,Jinan 250013,Shandong,China;Hefei University of Technology,Hefei 230009,Anhui,China)

机构地区：[1]山东电力工程咨询院有限公司勘测事业部,山东济南250013 [2]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《水利水电技术(中英文)》2025年第2期189-199,共11页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(51579063)。

摘　　要：【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。[Objective]The periodic fluctuation of reservoir water level will lead to the strength deterioration and deformation exacerbation of the rock and soil on the reservoir bank slope,which affect the stability of the reservoir bank slope.[Methods]The uniaxial compression tests and CT scanning techniques were employed to study the evolution law of elastic modulus(E),Poisson’s ratio(v),and microstructural parameters of strongly weathered granite after multiple cycles of soaking-non soaking in Jiangxi Yanshan Pumped Storage Power Station.The correlation between deformation parameters and microstructure parameters of strongly weathered granite was obtained.Observing The microstructural changes of strongly weathered granite were observed after multiple soaking-non soaking cycles using a polarizing microscope,the structural change characteristics of strongly weathered granite were obtained,and its evolution mechanism was explored by combining the evolution laws of deformation parameters and microstructural parameters.[Results]The result showed that after the 8th soaking-non soaking cycle,the elastic modulus of strongly weathered granite decreased by 50.34%,and the Poisson’s ratio increased by 41.85%;The projected porosity of the three cross-sections increased by 20.34%,19.18%,and 16.29%respectively,and the number of pores increased by 52.99%,42.24%,and 30.59%respectively.[Conclusion]The research result indicate that:(1)The elastic modulus of strongly weathered granite gradually decreases and the Poisson’s ratio gradually increases with the increase of soaking-non soaking cycles.The deformation parameters deteriorate significantly during the first 8 cycles of soaking-non soaking,and deteriorate slowly after 8 cycles.(2)The projected porosity and void number increase gradually with the increase of soaking non soaking cycles,while the average porosity and void area and porosity and void distribution dimension decrease gradually.After 8 cycles of soaking-non soaking,the amplitude of changes in microstructural parameters

关 键 词：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 

分 类 号：TV743[水利工程—水利水电工程]