铁道科学与工程学报2025，Vol.22Issue(3)：1100-1111,12.DOI:10.19713/j.cnki.43-1423/u.T20240806
不同渗压下岩石-混凝土界面剪切渗流耦合初探
Experimental investigation on rock-concrete interface shear permeability properties under different pore pressures
摘要
Abstract
The interaction between support structures such as gravity dams and high-pressure water tunnels with the original rock interface under shear seepage coupling,and its impact on shear mechanical properties and seepage characteristics,was explored.Three-dimensional laser scanning technology was used to reconstruct the tunnel excavation boundary.Subsequently,semi-cylindrical granite specimens with natural rough surfaces were fabricated.The concrete was cast to form a rock-concrete cylindrical sample,which undergo standard curing.A novel rock-concrete interface shear seepage testing method designed for this research was employed to conduct shear seepage coupling experiments under various seepage pressures,examining the influence of seepage pressure on shear failure of the rock-concrete interface under stress coupling from seepage.The results reveal that the rock-concrete interface experiences stages of crack closure,elastic deformation,unstable crack propagation,dislocation fracture,and post-peak failure during the shear seepage coupling process.Fracture strength,peak strength,and residual strength all exhibit a linear decrease with increasing seepage pressure.The permeability initially decreases and then increases with shear strain,with maximum permeability lagging behind peak strength.Under shear seepage coupling,permeability is affected by interface aperture,roughness characteristics,and filling features,yet it linearly increases with aperture both before and after interface failure.The mechanical properties of granite and concrete influence the interface's shear resistance.As the seepage pressure rises,the granite interface wear improves.An analysis of the roughness characteristics of the sample interfaces before and after failure reveals that interface wear,primarily determined by the geometric characteristics of the granite interface,is concentrated at the shearing initiation point.The research results can provide a theoretical support and practical basis for the calculation of the stability of the foundation of extra-high dams and the design of the initial support of high hydraulic pressure tunnels.关键词
岩石-混凝土界面/剪切/渗流/渗压/渗透率Key words
rock-concrete interface/shear/seepage/pore pressure/permeability分类
建筑与水利引用本文复制引用
贾朝军,庞锐锋,张升,郑艳妮,雷明锋,施成华..不同渗压下岩石-混凝土界面剪切渗流耦合初探[J].铁道科学与工程学报,2025,22(3):1100-1111,12.基金项目
国家自然科学基金资助项目(52378421,52178402) （52378421,52178402）
中国中铁股份有限公司科技研究开发计划项目(2022-重点-10) （2022-重点-10）
