山岭隧道膨胀压力解析解基本问题研究  

A Study of the Basic Issues Regarding the Swelling Pressure Analytical Solution for Mountain Tunnels

作　　者：李化云[1] 张志强[1] 张洋[1] 陈礼明[1] 杨翔[2] 张孝伟[2] 

机构地区：[1]西南交通大学土木工程学院,交通隧道工程教育部重点实验室,成都610031 [2]中铁二院昆明勘察设计研究院有限责任公司,昆明650200

出　　处：《现代隧道技术》2014年第1期54-61,共8页Modern Tunnelling Technology

基　　金：国家自然科学基金(No.51278427);高铁联合基金(U1134208);中国中铁股份有限公司重点科技开发计划重大课题(No.重大-18-2011)

摘　　要：膨胀性围岩具有吸水膨胀的特性,不仅使隧道支护结构的受力和变形显著表现在施工阶段,其"后荷效应"还长期呈现在运营阶段,从而有别于一般的隧道。文章采用弹性力学原理,研究推导了隧道围岩在不同膨胀条件下,隧道支护结构所受压力及变形的解析解;从理论上,分析判明了在随围岩膨胀率变化、结构支护刚度变化和围岩膨胀压力变化的情况下,隧道支护结构受力与变形关系及分布规律;结合工程实例,采用有限元方法进行了验证。计算结果表明该解析解具有一定的可靠性,能为该类隧道的设计和施工提供依据,对建成后的结构长期安全性评价,也有重要意义。The swelling tendency of expansive rock not only results in the obvious manifestation of supporting structure stress and deformation at the construction stage, but also has a long-term ＂post-loading effect＂ during the operation stage, which is different from general tunnels. Based on the principle of elastic mechanics, this paper derives the analytical solution of tunnel support structure stress and deformation under different swelling conditions of surrounding rock. It also analyzes the theoretical relationship between the tunnel support structure stress and deformation and their distribution law regarding the variations of the rock swelling rate, structure support rigidity, and rock swelling pressure. Using a project as an example, the finite element method is adopted for verification, and the results prove that this analytical solution has a certain degree of reliability and can provide a basis for tunnel design and construction as well as a long-term safety evaluation for completed structures.

关 键 词：山岭隧道 膨胀性围岩 支护结构 弹性解析解 膨胀压力 应对措施 

分 类 号：U452[建筑科学—桥梁与隧道工程]