The Chinese Journal of Nonferrous Metals
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|第11卷 第1期 总第57期 2014年2月|
(中南大学 土木工程学院，湖南 长沙 410075)
摘 要: 以长沙地铁1号线营盘路——五一广场区间为背景，利用三维差分方法模拟盾构隧道近接下穿复杂双层地下空间结构的施工过程。研究在168，224和335 kPa等3种不同顶推力下，盾构施工引起的地表沉降，既有隧道及地下商业街的竖向位移，附加弯矩，轴力的影响规律和盾构隧道左、右线开挖的相互影响。研究结果表明：在盾构隧道接近并穿越既有隧道的交叠区域内，引起既有建筑物的附加内力和变形，对其结构造成不利影响；在该区域以外，施工的影响较小，其影响程度与顶推力存在一定关系。随顶推力增大，既有建筑物的沉降和附加内力也随之增大，但其影响比较有限。
（School of Civil Engineering, Central South University, Changsha 410075, China）
Abstract:Taking the line one of Changsha Metro shield tunnel from the Yingpan Road to the Wuyi Square as a background, three-dimensional difference method was used to simulate construction process of shield tunnels, which traverse complex underground space structure. The influence of vertical displacement, additional moment and axial force of the constructed tunnel and underground commercial street was studied under the thrust forces of 168, 224 and 335 kPa, which are caused by construction of shield tunnel. Mutual influence of left/right line of shield was also investigated. The results indicate that adverse effects of additional internal forces and deformation of the constructed tunnel and underground commercial street are caused by construction of shield tunnel within a certain overlapping range and it has little impact beyond this range, and the influence degree related with the magnitude of thrust force. The settlement and additional internal forces of the existing tunnel could increase with the increase of thrust force, while it has limited effect.
Key words: shield tunnel; existing tunnel; underground commercial street; internal force; settlement;FLAC3D