盾构隧道管片裂缝开展规律数值试验

发布时间：2019-03-23 14:58

【摘要】：管片裂缝会影响盾构隧道衬砌结构性能。为研究管片裂缝开展规律,文章以西安地铁某区间隧道涌水事故导致管片裂缝病害为背景,利用ANSYS软件SOLD65单元建立三维非线性模型,分析管片裂缝开展规律。结果表明:(1)无空洞条件下,荷载小于2倍设计值时,管片无裂缝;当荷载位于2.5倍设计值和4倍设计值之间时,裂缝数量逐步增加,裂缝数量与荷载关系近似呈s曲线;(2)依托工程空洞条件下,当施加设计荷载时,出现偏压现象,随着荷载增大裂缝开展较快,当施加荷载达到2.7倍设计荷载时,裂缝急剧增加,裂缝分布不对称,空洞周边裂缝密集,大于3倍设计荷载时,结构失稳破坏。文章研究结果可为病害处治提供理论依据,为类似工程提供借鉴。
[Abstract]:The segment crack will affect the lining performance of shield tunnel. In order to study the developing rule of segment crack, this paper takes the damage of segment crack caused by water gushing accident in a section of Xi'an subway as the background, establishes three-dimensional nonlinear model by using SOLD65 element of ANSYS software, and analyzes the developing rule of segment crack. The results show that: (1) when the load is less than 2 times the design value, there is no crack in the segment without voids; When the load is between 2.5 times design value and 4 times design value, the number of cracks increases gradually, and the relationship between crack number and load is approximately s curve. (2) under the condition of engineering cavity, when the design load is applied, the phenomenon of bias appears, and the crack develops quickly with the load increasing. When the load reaches 2.7 times the design load, the crack increases sharply and the distribution of the crack is asymmetrical. When the cracks around the cavity are dense and more than 3 times the design load, the structure is unstable and destroyed. The results of this study can provide theoretical basis for disease treatment and provide reference for similar projects.
【作者单位】：长安大学陕西省公路桥梁与隧道重点实验室;长安大学公路学院;郑州兴港投资发展集团有限公司;中国中铁电气化局集团有限公司城铁公司;
【基金】：陕西省科技厅社会发展科技攻关项目(2016SF-412) 陕西省科技统筹创新工程计划项目(2015KTZDGY01-05-02) 中央高校基本科研业务费专项资金项目(优秀博士学位论文培育资助项目,310821165011)
【分类号】：U455.43

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