偏压连拱隧道临界偏压状态确定方法研究  

Research on Critical Status for Double-arched Tunnel under Unsymmetrical Pressure

作　　者：刘勇[1] 宋玉香[1] 

机构地区：[1]石家庄铁道学院土木工程分院,河北石家庄050043

出　　处：《石家庄铁道学院学报》2007年第4期6-8,共3页Journal of Shijiazhuang Railway Institute

摘　　要：连拱隧道洞口地段由于地形原因经常造成偏压,而《公路隧道设计规范》只是给出了偏压隧道的围岩压力计算公式,但是没有明确公式的适用范围。基于普氏理论对连拱隧道的临界偏压状态进行了分析,得出了不同围岩级别不同坡度情况下产生偏压的最大埋深。同时,采用数值方法计算了各种偏压情况下的地层偏压规律,为设计和施工提供了基础数据。The unsymmetrical pressure always results from shallow depth ground partial pressure in the tunnel portal section. The calculation formula of unsymmetrical pressure is given in ＂Code for Design of Road Tunnel＂, but the applicable conditions are not explained. In this paper, based on Protojiakonov Theory, the critical status is analyzed for double-arched tunnel in unsymmetrical pressure, and the maximum depths in different rock classification and gradient are obtained. At the same time, the stress effects under different unsymmetrical pressures are calculated using the FEM, providing the basic data for design and construction in the same condition.

关 键 词：连拱隧道 偏压 临界偏压状态 偏压规律 

分 类 号：TU455[建筑科学—岩土工程]