隧道地下风机房交叉结构施工过程稳定性研究  

Study on stability in construction process for junction structure of ventilator room in tunnel

作　　者：梁桥欣 郑明辉 张志强[2] 何本国[2] 

机构地区：[1]中铁交通投资集团,广西南宁530000 [2]西南交通大学,四川成都610031

出　　处：《铁道建筑》2015年第12期50-53,共4页Railway Engineering

基　　金：国家自然科学基金项目(51478396)

摘　　要：针对风机房地下洞群结构的复杂性,选取包含风机房主体洞室的结构单元,建立三维数值模型,采用有限元法,研究地下风机房施工过程中的围岩位移、初支结构与围岩间的相互作用力以及支护结构的受力情况。结果表明:风机房采用全断面施工时,能较早使支护结构闭合,减小围岩的变形,但相对于台阶法施工,围岩的应力释放少,支护结构与围岩间的接触应力、支护结构的内力都较大;风机房支护结构与围岩间的接触应力呈对称分布,拱顶至拱脚接触应力逐渐增大;拱脚至墙脚中部接触应力逐渐减小;墙脚中部至墙脚底部接触应力逐渐增大。For the structure complexity of wind ventilator room underground tunnel group,the three-dimensional numerical model was created by selecting the structure element of the ventilator room main chamber and using finite element method,and surrounding rock displacement,initial support structure,the interaction force among the surrounding rocks and the inner force of the support structure during the construction process of underground ventilator room were studied. Results showed that the whole section construction of the ventilator room will make the support structure close earlier and reduce the surrounding rock deformation,which leads to the fact that the stress release of surrounding rock is little,the contact stress between the support structure and the surrounding rock,and the internal force of support structure are relatively large with respect to step method construction,ventilator room support structure and contact stress among the surrounding rocks has the symmetric distribution,contact stress gradually increases from the vault to arch springing,gradually decreases from arch springing to middle of foundation,and gradually increases from middle of foundation to bottom of foundation.

关 键 词：隧道 地下风机房 交叉结构 施工力学 稳定性 

分 类 号：U455[建筑科学—桥梁与隧道工程]