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。
Segment cracks can affect the performance of shield tunnel linings. Based on tunnel segment cracking caused by a water inflow event in a certain running tunnel of the Xi＇ an metro, a three-dimensional nonlinear model was set up using ANSYS software SOLD65 element to analyze the crack development of tunnel segments. The re- sults show that： 1） no cracks appear on the tunnel segment when the load is less than 2 times of the design value with the condition of no void; 2） the number of cracks gradually increases when the load is between 2.5 times and d times the design value; 3） the relationship between the number of cracks and the load is close to a S-curve; 4） with the condition of voids, bias pressure appears when the designed load is applied, and segment cracks develop rapidly with an increase of the loading; 5） the number of cracks increases dramatically when the applied load is 2.7 times the designed load; 6） the crack distribution is asymmetrical and it is intensive near the voids; and 7） the structure is instable and failed when the applied load is more than 3 times the designed value.
出处
《现代隧道技术》
EI
CSCD
北大核心
2017年第1期138-144,共7页
Modern Tunnelling Technology
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)
