有压引水隧洞内水外渗作用研究
Study on the Effect of Seepage from Underground Hydraulic Tunnel Under High Internal Water Pressure
作者：杜小凯(河海大学 水利水电工程学院，南京 210098)；任青文(河海大学 土木工程学院，南京 210098)；陈伟(河海大学 土木工程学院，南京 210098)
Author：(College of Water Conservancy and Hydropower Eng., Hohai Univ., Nanjing 210098,China)；(College of Civil Eng., Hohai Univ., Nanjing 210098,China)；(College of Civil Eng., Hohai Univ., Nanjing 210098,China)
收稿日期：2007-10-09 年卷（期）页码：2008,40(5):63-68
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：水工隧洞；渗流-应力耦合场；Biot固结理论；敏感性分析；结构面
Key words：hydraulic tunnel; seepage-stress coupling field; Biot’s consolidation theory; sensitivity analysis; structural plane
基金项目：国家自然科学基金委员会资助项目（50539030）；国家重点基础研究973项目资助（2007CB714104）
中文摘要
基于Biot固结理论，对统一域混合模型进行改进，考虑了结构面的法向渗透特性，对高压内水外渗进行了渗流场-应力场耦合计算，以衬砌上钢筋应力变化为代表，反映内水外渗耦合计算分析下的结构应力状态的变化。并以衬砌上的微裂缝宽度、围岩渗透系数、岩体结构面的产状为影响因素，以衬砌外沿最大孔隙水压为系统特性，进行了敏感性研究。结果表明，高压内水外渗耦合计算分析步中钢筋拉应力变小；衬砌微裂缝的宽度是影响衬砌外沿最大孔隙水压的主要因素，围岩渗透系数为次要因素，结构面的产状对其影响最小，但是对孔隙水压的分布影响较大。
英文摘要
Based on Biot’s consolidation theory seepage-stress coupling field is computed to investigate the influence of the seepage and the entity mixed model is improved,considering the hydraulic exchange between the structural plane and the rock mass in normal direction, in which the variation of steel stress is used to reflect the change of stress state in the structure. Then sensitivity analysis is done to investigate the maximum water pressure acting on the exterior surface of tunnel liner considering influencing factors such as the crack width in concrete of tunnel liner, the permeability of surrounding rock and the occurrence of structural plane in rock mass. The analysis results reveal that the tensile stress of rebar decreases in the coupling analysis step. It is also found that the maximum water pressure acting on the exterior surface of tunnel liner is the most sensitive to the crack width and insensitive to the occurrence of structural plane. But the occurrence of structural plane has great effect on the distribution of water pressure.
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