摘要
衬砌脱空是水工隧洞常见且危害严重的结构病害,但现有研究对高水压下脱空-接触非线性行为影响裂缝发展的机理认识不足。基于弥散裂缝与虚拟裂缝模型,建立了考虑“脱空-接触”非线性行为的数值模型,研究高水压隧洞衬砌脱空的开裂机理。结果表明:衬砌脱空显著降低起裂水头、增加裂缝数量并改变其形态;不接触脱空时裂缝由中部外侧向内扩展且宽度最大;脱空-接触工况下中部裂缝扩展受抑制,但分界处裂缝风险上升。该方法可准确揭示裂缝演化规律,为含脱空隧洞的安全评估提供有效工具。
Lining debonding is a common and severe structural defect in hydraulic tunnels,yet the mechanism by which the nonlinear“debonding-contact”behavior influences crack development under high water pressure is not fully understood.Based on smeared crack and virtual crack model,a numerical model considering the“debonding-contact”nonlinear behavior is established to investigate the cracking mechanism of debonded tunnel linings under high water pressure.The results indicate that:(a)the lining debonding significantly reduces the cracking head,increases the number of cracks,and alters their morphology;(b)in cases of non-contact debonding,cracks initiate from the outer surface of the mid-span and propagate inwards,exhibiting the maximum width;and(c)under the debonding-contact condition,the propagation of the central crack is suppressed,while the cracking risk at the boundary of the debonded region increases.This method can accurately reveal the evolution of cracks and provide an effective tool for the safety assessment of tunnels with lining debonding.
作者
张健
李龙龙
张圣煌
卢雨欣
苏博文
林兴铖
李东明
胡博扬
ZHANG Jian;LI Longlong;ZHANG Shenghuang;LU Yuxin;SU Bowen;LIN Xingcheng;LI Dongming;HU Boyang(Huadian Fuxin Zhouning Pumped Storage Co.,Ltd.,Ningde 355400,Fujian,China;Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210024,Jiangsu,China)
出处
《水力发电》
2026年第4期59-68,共10页
Water Power
基金
国家重点研发计划(2022YFC3005403)。
关键词
水工隧洞
衬砌脱空
衬砌开裂
弥散-虚拟裂缝结合
脱空-接触
数值模拟
hydraulic tunnel
lining debonding
lining cracking
combined smeared-virtual crack model
debonding-contact
numerical simulation
