地下钢筋混凝土岔管围岩稳定及结构数值分析  

Numerical Analysis of Surrounding Rock Stability and Lining Structure of Underground Reinforced Concrete Bifurcation

作　　者：张继勋[1] 任旭华[1] 

机构地区：[1]河海大学水利水电工程学院,南京210098

出　　处：《三峡大学学报（自然科学版）》2011年第5期1-6,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金委员会"二滩水电开发有限责任公司雅砻江水电开发联合研究"基金项目(50539090);中央高校科研业务经费项目(2009B07714);国家自然科学基金面上项目(50978083)

摘　　要：以国内某抽水蓄能电站的钢筋混凝土岔管工程为例,从围岩开挖支护、围岩与衬砌相互作用和钢筋混凝土结构等方提出了围岩、混凝土等材料的数值模拟方法,通过三维有限元线性和非线性计算,分析研究了地下钢筋混凝土岔管在施工、运行等工况下,围岩、衬砌结构的应力与变形,以及混凝土岔管结构配筋和配筋后应力、裂缝开展等问题.结果表明:在开挖阶段由于地应力释放在主、岔洞交叉处会产生拉应力,塑性区开展较深;正常运行工况在内水压力作用下岔管结构大部分区域存在拉应力,裂缝较大;检修工况在外水压力作用下仅在主、岔管交叉处存在拉应力区,裂缝较小;结构配筋时,轴向配筋应该由外水作用的工况来控制,环向配筋由内水作用为主的工况来控制.In accordance with the practice of a certain pumped storages power station＇s reinforced concrete bifurcation,the excavation and supporting of surrounding rock,interaction between surrounding rock and lining,behavior of reinforced concrete are modeled.The method of numerical simulation of materials such as surrounding rock,lining and so on is presented.And by using 3D linear and nonlinear FEM,the stress and deformation of surrounding rock,reinforcement of lining material,stress and crack in reinforced concrete bifurcation structure are analyzed for a certain pumped-storage power station.Calculation results show that：tension stress zone and plastic zone mainly exist in connection region of main tunnel and bifurcation tunnel under construction,during error-free running work condition most region of the bifurcation structure exist tension stress,crack width is large;during overhaul work condition tension stress only exist in connection region of main tunnel and bifurcation tunnel,crack width is small.The reinforcement rate for concrete lining is that the axial reinforcement rate is controlled by external water pressure;and ring reinforcement rate is controlled by interal water pressure.

关 键 词：钢筋混凝土岔管 围岩 衬砌结构 数值分析 

分 类 号：TV332[水利工程—水工结构工程]