摘要
为了解决目前在设计中尚无满足连拱隧道特点的围岩压力理论,特别是在浅埋偏压条件下围岩载荷估计偏差较大问题,应用岩柱理论求得塌落拱曲线方程,用作图法确定地形偏压临界覆土厚度,对偏压连拱隧道与非偏压连拱隧道进行界定。在此基础上,提出浅埋偏压连拱隧道地层主动偏压载荷和被动不均匀载荷确定方法及地形偏压情况下隧道支护结构的合理计算方法,并求得不同坡率、不同围岩级别条件下浅埋侧土体的弹性抗力系数的合理取值,为设计中偏压连拱隧道采用载荷结构模式计算时浅埋侧土体的弹性抗力系数取值提供参考。
Currently there is no surrounding rock pressure theory which meets multi-arch tunnel features. In particularly, estimation error in rock load is still large under shallow and unsymmetrical pressure conditions. The curve equation of slumping arch is derived using rock pillar theory. The critical overburden thickness under the condition of unsymmetrical pressure terrain is established by graph method and used for boundary definition between unsymmetrical pressure and symmetrical pressure tunnels. Based on the discussions above, a determination method of active unsymmetrical load and passive uneven load for shallow unsymmetrical pressure multi-arch tunnels and a calculation method for support structure of tunnels under the condition of unsymmetrical pressure terrain are proposed. Also, the elastic resisting coefficient of shallow buried soil under the condition of different slopes and rock classification is obtained, which provides reference for moderate unsymmetrical pressure multi-arch tunnels with load-structure model.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2010年第1期75-78,共4页
Journal of Liaoning Technical University (Natural Science)
基金
安徽省交通投资集团科研基金资助项目(TJ2005L0110)
关键词
偏压连拱隧道
围岩压力
塌落拱
载荷结构模式
计算方法
multi-arch tunnel under unsymmetrical pressure
surrounding rock pressure
slumping arch
load-structure model.
calculation method
