下穿黄河区间盾构隧道埋深和管片厚度的优选分析  

Optimization Analysis of Buried Depth and Segment Thickness of Shield Tunnel Crossing below the Yellow River

作　　者：马晓波[1] 

机构地区：[1]中铁第一勘察设计院集团有限公司城建院,西安710043

出　　处：《铁道标准设计》2014年第2期75-78,共4页Railway Standard Design

摘　　要：通过对兰州地铁下穿黄河区间盾构隧道施工过程的三维数值模拟,分析两种不同埋深和管片厚度共4种工况时的围岩压力、管片应力、地面沉降,结果表明,围岩侧腰受到的主应力和剪切应力较大,埋深是影响围岩压力和地面沉降及管片变形的主要因素,管片厚度虽不是影响地面沉降的主要因素,但总体来说,增大管片厚度有利于保证隧道安全。通过比选确定兰州地铁下穿黄河段盾构隧道埋深为25 m,管片厚度为350 mm。Through three-dimensional numerical simulation of the construction process of Lanzhou Metro shield tunnel crossing below the Yellow River, the surrounding rock pressure, segment stress and ground subsidence were analyzed with two different buried depths and segment thicknesses totaling four conditions. The results show that ： （a） the larger principal stress and shear stress appear at the side waist of surrounding rock, while the buried depth is the main factor which impacts the rock pressure, land subsidence and segment deformation; （b） although segment thickness is not the major cause affecting land subsidence, in general, increasing the segment thickness can be conducive to ensuring tunnel safety. Finally, by means of comparison, the buried depth of Lanzhou Metro shield tunnel crossing below the Yellow River is determined to be 25 m, with the segment thickness of 350mm.

关 键 词：地铁 下穿黄河 盾构隧道 施工稳定性 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]