| 双圆盾构穿越下立交结构的流-固耦合数值模拟 |
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| 引用本文： | 陈宇,张庆贺,朱继文,姚海明.双圆盾构穿越下立交结构的流-固耦合数值模拟[J].岩土力学,2010,31(6):1950-1955. |
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| 作者姓名： | 陈宇 张庆贺 朱继文 姚海明 |
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| 作者单位： | 1. 同济大学,地下建筑与工程系,上海,200092
2. 上海市第二市政有限公司,上海,200232 |
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| 摘 要： | 依托上海轨道交通M10线双圆盾构区间隧道工程，对自由场下双圆盾构隧道施工力学行为进行三维有限差分数值模拟，分析了盾构施工地表沉降及超孔隙水压力的特征、量值与范围，并与监测结果进行对比，以得到能够反映施工技术水平的模拟施工参数。将该模拟施工参数应用于下立交下双圆盾构的推进，用以预测盾构掘进对下立交底板的影响。研究结果表明，在三面封闭的条件下，盾构施工引起的正超孔压很难向外界消散、负超孔压也很难得到外界水位的补给；在开挖面前方，底板受到挤压力，且挤压力主要由超孔隙水压力组成；沿横向方向，作用在下立交底板下的超孔隙水压力分布较均匀，而土体颗粒的挤压力则主要分布在其中线附近；下立交结构的刚性位移是引起底板沉降的主要原因，底板变形引起的沉降较小，变形最大值在盾尾脱离时取得。
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| 关 键 词： | 双圆盾构 上覆结构物 流固耦合理论 数值模拟 |
| 收稿时间： | 2008-12-01 |
Coupled fluid-mechanical analysis of DOT shield tunnel construction beneath adjacent existing underpass |
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| CHEN Yu,ZHANG Qing-he,ZHU Ji-wen,YAO Hai-ming.Coupled fluid-mechanical analysis of DOT shield tunnel construction beneath adjacent existing underpass[J].Rock and Soil Mechanics,2010,31(6):1950-1955. |
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| Authors: | CHEN Yu ZHANG Qing-he ZHU Ji-wen YAO Hai-ming |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Shanghai No.2 Municipal Engineering Corporation, Ltd., Shanghai 200232, China |
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| Abstract: | Based on the construction of Shanghai Metro Line No.10, the characteristic, magnitude and range of ground settlement and excess pore water pressure induced by double-o-tube (DOT) shield construction in free field were analyzed by means of tridimensional finite difference numerical simulation. Analysis results were compared with site monitoring results to get the parameters of simulation construction which could reflect actual construction level. The parameters of simulation construction were applied to the analysis of DOT shield driving beneath existing underpass to forecast the influence of shield tunnelling on the bottom slab of the underpass. The studies indicate that the positive excess pore pressure is hard to dissipate to external environment and the negative excess pore pressure is hard to get water replenishment from external environment induced by shield construction beneath adjacent existing underpass; in front of DOT shield’s excavating face, the underpass’s bottom slab is bearing extrusion force mainly composed of excess pore water pressure; the excess pore water pressure acting on the bottom slab is well distributed in transverse direction, however the soil grain’s extrusion force mainly distribute around the centerline of bottom slab; the rigid displacement of the underpass is the main reason of bottom slab’s settlement; and the structural deformation of bottom slab just induces less settlement; the interspaces of shield tail is the main reason for the deformation of soil mass and adjacent structures owing to shield tunnel construction. |
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| Keywords: | double-o-tube shield adjacent existing upper structure coupled fluid-solid theorem numerical simulation |
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