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现代隧道技术 2017, Vol. 54 Issue (3) :126-134    DOI:
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盾构隧道衬砌背后空洞对结构影响规律数值分析
(1长安大学陕西省公路桥梁与隧道重点实验室, 西安710064; 2郑州新郑综合保税区(郑州航空港区)兴港投资发展有限公司, 郑州450019; 3中国中铁一局集团有限公司物探检测中心, 西安710055)
Numerical Analysis of the Influence of a Cavity behind the Shield Lining on the Tunnel Structure
(1 Shanxi Provincial Major Laboratory for Highway Bridge & Tunnel, Chang′an University, Xi′an 710064; 2 Zhengzhou Xinggang Investment & Development Group Co. Ltd., Zhengzhou 450016; 3 Geophysical Test Center, China Railway First Group Co. Ltd., Xi′an 710055)
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摘要  文章以西安地铁某区间隧道涌水导致衬砌背后空洞事故为依托, 利用 ANSYS有限元数值方法, 分析了空洞位置和大小对盾构隧道的影响。结果表明: 衬砌背后无空洞时, 围岩应力集中系数等值线呈蝶形分布, 隧道顶部和底部应力集中最大, 两侧最小; 衬砌背后空洞在两侧时, 对围岩的应力集中、 管片的内力和安全系数影响最大, 随着空洞向顶部和底部移动, 影响减小; 随着与空洞之间距离的增加, 围岩的应力集中、 管片的内力和安全系数受到的影响减小; 轴力受空洞大小的影响较小, 而管片弯矩、 围岩应力集中及安全系数受空洞大小影响较大; 随着空洞面积的增加, 空洞对周围土体的应力集中、 管片的内力和安全系数影响增大。
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Abstract: A numerical analysis of the influence of a cavity behind the lining of a shield tunnel was performed in respect to the position and size of the cavity based on the water inflow of a running tunnel on the Xi′an metro using ANSYS software. The results show that: 1) the contour line of the stress concentration factors (SCF) is presented in a butterfly shape—with the largest stress concentration at the top and bottom of the tunnel and the smallest ones at the two side—if there is no cavity behind the lining; 2) if the cavities behind the lining are located at the two sides, it has a significant impact on the stress concentration of the surrounding rock, internal force and safety factor of the segment and the impact decreases with the movement of the cavity toward the top and bottom of the tunnel; 3) with an increase of distance from the cavity, the impact on the stress concentration of the surrounding rock, internal force and safety factor decreases; 4) axial force is less affected by the cavity size while the segment bending, stress concentration of the surrounding rock and safety factor are much more affected by the cavity size; and 5) with an increase of the cavity area, the impact of the cavity on the stress concentration of the surrounding soil mass, internal force and safety factor of the segment increases.
KeywordsShield tunnel,   Cavity behind the lining,   Numerical simulation,   Segment,   Mechanical properties     
基金资助:基金项目: 陕西省科技厅社会发展科技项目 (2016SF-412); 长安大学中央高校基本科研业务专项基金项目 (310821172004) .
作者简介: 作者简介: 赖金星 (1973-), 男, 博士, 教授, 主要从事隧道工程方面的教学与研究工作, E-mail:373159626@qq.com.
引用本文:   
.盾构隧道衬砌背后空洞对结构影响规律数值分析[J]  现代隧道技术, 2017,V54(3): 126-134
.Numerical Analysis of the Influence of a Cavity behind the Shield Lining on the Tunnel Structure[J]  , 2017,V54(3): 126-134
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