浅埋暗挖黄土地铁隧道施工地层空间变位分析  

The Analysis of Space Deformation of Shallow Excavation Loess Metro Tunnel

作　　者：康佐 郑甲佳[2] 谢永利[3] 

机构地区：[1]西安市地下铁道有限责任公司,西安710018 [2]交通运输部公路科学研究院,北京100088 [3]长安大学,西安710064

出　　处：《铁道工程学报》2014年第3期102-109,共8页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(51378071);陕西省自然科学基金(2013JQ7030);西安市地下铁道有限公司科技项目(D2-YJ-022008204);中央高校基本科研业务费专项资金(CHD2012ZD 019);长安大学基础研究支持计划专项基金

摘　　要：研究目的：为了解浅埋暗挖黄土地铁隧道施工地层空间变位规律，本文结合西安地铁二号线依托工程，构建三维数值计算模型，对黄土地区浅埋暗挖地铁隧道施工的地表、地层纵、横向变形规律进行系统研究，以期提高黄土地区地铁区间隧道的修筑水平。研究结论：（1）双洞开挖的空间效应与开挖洞径和相对位置有直接关系，后开挖洞室掌子面距先行洞室测试断面两倍洞径左右时开始产生影响，开挖洞室到先行洞室测试面断面时，影响最大；（2）浅埋暗挖法施工中地表地层沉降基本经历缓慢变化、急剧变化及逐渐平稳三个阶段；（3）施工对地层的影响与埋置深度近成反比关系，随地层深度逐渐增加，施工对另一侧地层的影响则逐渐减弱；（4）沉降速率与距离监测断面成反比关系，随掌子面向监测断面的靠近而不断增大，而后随着掌子面远离监测断面而不断减小，呈漏斗形，最大值在掌子面过后的2～4m的范围；（5）横向的地表沉降曲线呈宽底漏斗状，地层沉降曲线变为标准w形；（6）本文研究成果可为西安地铁修建中的地上地下重点文物和古今建筑的保护提供技术支持。Research purposes： In order to understand the laws of space deformation of shallow excavation metro tunnel construction in loess area, this paper constructs a three -dimensional numerical calculation model, which is based on the project of Xi＇an NO. 2 metro line, and systematically researches the laws on the vertical and horizontal deformation of the surface and stratum, looking forward to enhance the construction level of metro tunnel in loess area. Research conclusions： （ 1 ） The spatial effect on double - hole excavation is directly related to the hole diameter and the relative position, which the impact will take place when it is around twice diameters far between the face of the latter excavated cavern and the test section of the former one, and without any effect when the distance is excess the range. （2） The surface deformation is divided into three stages, which involves slow change, rapid change and gradual stability with shallow tunneling method. （3） The influence of the construction on stratum is inversely proportional to the embedded depth that with the increasing depth, the effect on the other side of stratum decreases. （4） Similarly, the inverse relation takes place between the settlement rate and the distance of test section that with the face becomes closer to the section, the rate increases. On the contrary, the rate constantly decreases when the distance becomes more far, which shown as an infundibulum, and the maximal value of it is at the area 2 to 4 meters after the face. （5） The transverse settlement curve of surface appears an infundibulum with wide bottom, and the settlement curve of stratum shows a standard ＂W＂. （6） The above- mentioned conclusions offer a technical support to the protection of ground ＆ underground key cultural relics and ancient ＆ modem buildings in the construction of Xi＇an metro.

关 键 词：黄土地铁隧道 浅埋暗挖 空间变位 数值分析 

分 类 号：U25[交通运输工程—道路与铁道工程]