基于等效渗透系数计算衬砌水压力方法研究  

Study of the Calculation of External Water Pressure on Tunnel Lining Based on the Equivalent Permeability Coefficient of the Composite Lining

作　　者：郑波[1] 王建宇[1] 吴剑[1] 

机构地区：[1]中铁西南科学研究院有限公司,成都611731

出　　处：《现代隧道技术》2011年第6期43-46,57,共5页Modern Tunnelling Technology

基　　金：铁道部科技研究开发计划课题(编号:2009G005-D);中国中铁股份有限公司科技开发计划课题(编号:重点-40-2011)支持

摘　　要：对于设置防水板和排导系统的复合式衬砌,由于防水板的隔水作用,围岩渗水主要通过防水板背后的盲管、反滤层及二次衬砌边墙底部排水孔排入隧道底部排水沟。这种地下水排导系统的设置,使得衬砌水压力的计算很难通过简化的解析方法求得。文章从工程实用化角度出发,提出了复合式衬砌等效渗透系数的概念和确定方法,其主要是通过引入虚拟的二次衬砌等效渗透系数"kl*",将设置防水板和排导系统的复合式衬砌的透水能力用等效渗透系数"kl*"来表示。在复合式衬砌等效渗透系数的基础上,可以利用整体式衬砌结构的水压力计算方法估算衬砌水压力,等效渗透系数"kl*"为复合式衬砌水压力的简化计算提供了有利条件。最后,通过算例验证了这种方法的合理性、有效性。A composite lining includes a waterproof sheet and a drainage system, which makes the underground water behind the tunnel lining drain mainly through a blind pipe, filter layer and drainage hole at the sidewall into the bottom of the drainage ditch. Therefore, it is usually very difficult to calculate the external water pressure on the composite lining by a simple analytical method. This paper, from a practical point of view, proposed a new concept-equivalent permeability coefficient of the composite lining-and its corresponding determination method. The equivalent permeability coefficient of the composite lining can represent the infiltration ability of the waterproof sheet and drainage system, and the introduction of this concept into the composite lining greatly simplified the calculation of the external water pressure on the composite lining. Finally, an engineering example is provided to validate the rationality and validity of this method.

关 键 词：复合式衬砌 排导系统 衬砌水压力 等效渗透系数 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]