考虑所有洞室开挖影响的蟠龙地下厂房结构特性分析  

Structural characteristics of Panlong Underground Powerhouse considering excavation of all caverns

作　　者：袁长安 苏超[2] YUAN Changan;SU Chao(Chongqing Panlong Pumped Storage Co.,Ltd.,Chongqing 401452,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]重庆蟠龙抽水蓄能有限公司,重庆401452 [2]河海大学水利水电学院,江苏南京210098

出　　处：《水利水电科技进展》2018年第6期56-60,共5页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51279053)

摘　　要：目前研究大型地下洞室群稳定问题所采用的计算模型为仅包含主厂房、主变室、母线洞及部分引水洞和尾水洞的三维简化模型,没有考虑其他洞室开挖对主厂房的影响,与实际工程不完全相符。为此,结合蟠龙水电站地下洞室群工程建立包含所有洞室的三维有限元模型及仅包含部分洞室的三维简化模型,采用三维非线性有限单元法研究洞室群在开挖过程中的变形规律和应力状态。结果表明:两种模型的应力、位移、塑性区的分布规律基本相似,包含所有洞室的三维有限元模型的计算结果普遍大于简化模型的计算结果,其中主厂房上游墙的水平位移差达19. 5%。从工程安全角度考虑,建议地下洞室群施工仿真分析选择包含所有洞室的三维有限元模型。Current numerical models for studying the stability of underground cavern group are simplified 3D models that are only composed of the main powerhouse,the main transformer chamber,the main electrical wire hall,part of the diversion tunnel and tailrace tunnel.The influence of the excavation of other caverns is usually ignored,leading to the inconsistency with realistic project conditions.In this study,a 3D FEM model of the Panlong Power Station,considering all the caverns as well as a 3D simplified model only including part of the cavern was built.The deformation characteristics and stress states of the cavern group during excavation were studied using 3D nonlinear FEM.The results show that the simulated distributions of deformation field,stress field,and plastic zone between the two models are similar but the magnitudes of the results from the 3D FEM model considering all caverns are generally higher than that of the simplified model.The difference between the two simulated horizonal displacements of the upstream wall can reach 19.5%.Therefore,from the point of view of engineering safety,it is recommended to choose 3D FEM simulation models considering all caverns to perform stability analysis for underground cavern group excavation.

关 键 词：地下洞室 软岩 施工仿真 围岩变形 塑性区 蟠龙水电站 

分 类 号：TV222.2[水利工程—水工结构工程]