摘要
大型水利水电工程建设过程中,其地下隧洞或洞室开挖施工以及投入使用后,深埋脆性围岩会出现脆性向延性转化的时效性变化及破裂扩展的过程。利用FLAC3D内置的编码语言FISH复现了应力侵蚀SC模型,并将其嵌入FLAC3D内置的Hoek-Brown本构模型。以沙河抽水蓄能电站输水系统尾水岔管为研究对象,完成了其正常运行工况下的围岩稳定性分析以及支护结构应力变形分析,并以此为基础对其考虑应力腐蚀(以下简称SC:Stress Corrosion)的岩石时效性破裂扩展行为开展研究,揭示了抽水蓄能电站输水系统围岩的脆-延转化特性及时效性破裂扩展特性,对于抽水蓄能电站的设计及安全运行具有重要意义。
In the construction process of large-scale water conservancy and hydropower projects,after the excavation and commissioning of underground tunnels or caverns,the underground tunnels or chambers will undergo time-dependent changes from brittle to ductile behavior and fracture propagation in the deeply buried brittle surrounding rock.To realistically reflect the time effect of brittle rocks and combine it with actual engineering,this paper takes the typical brittle rock marble as the research object and starts from its typical mechanical characteristics and brittle-ductile transformation characteristics.Using the Hoek-Brown constitutive model,the full stress-strain curves of samples under different confining pressure triaxial test conditions,as well as the peak strength,residual strength,and post-peak characteristics of marble were studied.It is proved that the Hoek-Brown constitutive model in FLAC3D can well simulate the brittle-ductile transformation characteristics of brittle rocks.The stress corrosion(SC)model encoded in FISH was reproduced in the built-in Hoek-Brown constitutive model of FLAC3D.Taking the tailrace bifurcated pipes of the water conveyance system of the Shahe Pumped Storage Power Station as the research object,the stability analysis of the surrounding rock under normal operating conditions and the stress deformation analysis of the support structure were completed.Based on this,the time-dependent fracture propagation behavior of the rock considering SC was studied,revealing the brittle-ductile transformation characteristics and time-dependent fracture propagation characteristics of the surrounding rock of the water conveyance system of the pumped storage power station,which is of great significance for the design and safe operation of pumped storage power stations.
作者
徐明
邵明磊
白浩东
彭思睿
范博文
王涛
XU Ming;SHAO Ming-lei;BAI Hao-dong;PENG Si-rui;FAN Bo-wen;WANG Tao(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,Shanxi Province,China;State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,Hubei Province,China)
出处
《中国农村水利水电》
北大核心
2025年第5期79-85,共7页
China Rural Water and Hydropower
基金
中国电力建设股份有限公司重点科技项目(DJ-ZDXM-2023-03)。
关键词
FLAC3D
应力及变形演变
时间效应
岔管围岩
应力腐蚀
FLAC3D
evolution of stress and deformation
time-dependent
surrounding rock of bifurcated pipes
Ssress corrosion
