浅埋偏压小净距黄土隧道初支拱架选型  

Arches Selection in Primary Support for Shallow Buried Loess Tunnel with Small Interval & Unsymmetrical Pressure

作　　者：宿钟鸣[1] 刘睿 

机构地区：[1]山西省交通科学研究院,黄土地区公路建设与养护技术交通行业重点实验室,太原030006 [2]重庆市江津区建设工程质量监督站,重庆402260

出　　处：《地下空间与工程学报》2013年第3期610-614,657,共6页Chinese Journal of Underground Space and Engineering

基　　金：山西省交通建设科技项目(11-2-18)

摘　　要：黄土隧道设计中初期支护拱架的选型问题是目前争论的焦点问题之一。以格栅和型钢两种类型的支护结构为研究对象,采用数值模拟的方式,重点分析了浅埋偏压小净距黄土隧道洞周特征点土体位移,并结合两种支护结构下围岩塑性区大小和支护结构内力,得出格栅支护时的特征点土体位移略大于型钢支护,实测值也证实了该结论的可靠性;而支护结构内力则相反,且两种支护结构下的围岩塑性区相差不大,因此建议在浅埋偏压小净距黄土隧道初期支护设计中宜采用格栅支护措施。The problem of arches selection for primary support of loess tunnel is one of the problems in dispute that are now focused on. Based on two types of support, namely, grid and shaped steel ones, the soil displacement of characteristic points of tunnel is mainly analyzed by means of numerical simulation, in the shallow buried loess tun- nels with small interval ＆ unsymmetrical pressure, with considering the plastic zone of surrounding rock and internal forces of the support. Analysis results indicate that the displacement in the grid support is slightly larger than that of the shaped steel support, which is also confirmed by the measured data ;it is opposite for the internal forces, besides, the plastic zones are almost the same in the two types of support ; so it is suggested that the gird support should be a- dopted in the design of primary support of such tunnel.

关 键 词：浅埋偏压 小净距黄土隧道 格栅支护 型钢支护 拱架选型 

分 类 号：U455.91[建筑科学—桥梁与隧道工程]