不同拼装方式下盾构隧道管片衬砌受力与破坏模式模型试验研究
发布时间：2018-09-05 10:48
【摘要】：管片拼装方式通常包括通缝拼装和错缝拼装两种形式,在不同工程中均有应用,拼装方式的不同直接造成管片衬砌结构体系上的差异,导致相同荷载条件下结构受力及破坏形态的显著差异。以狮子洋隧道为工程背景,采用相似模型试验方法,对比分析不同拼装方式对管片衬砌结构的力学特性及破坏特征的影响规律。试验结果表明:拼装方式对管片衬砌结构的力学性能及破坏形式影响显著,通缝拼装方式整体刚度相对于错缝拼装方式较小,衬砌结构发生失稳时,通缝拼装方式极限承载力最低,其临界失稳位移最大,在管片衬砌结构开始发生宏观破坏后迅速进入失稳阶段,承载力丧失具有突发性,衬砌结构破坏最为严重;错缝拼装提高了管片衬砌结构的极限承载能力,结构从局部出现宏观裂纹到发生整体失稳的过程较长,具有明显的渐进性特征,其中错缝拼装方式CF2的失稳开始荷载最大,临界失稳位移值最小,失稳破坏过程的渐进性明显,有利于管片衬砌结构承载及防水的需求。
[Abstract]:The piecewise assembling method usually includes two kinds of forms: joint assembly and staggered joint assembly, which are used in different projects, and the different assembling methods directly cause the difference in the structure system of segment lining. Under the same load conditions, there are significant differences in the stress and failure patterns of the structure. Taking Liaoyang Tunnel as the engineering background and adopting the similar model test method, the influence of different assembling methods on the mechanical properties and failure characteristics of segment lining structure is comparatively analyzed. The experimental results show that the mechanical properties and failure modes of segment lining structure are significantly affected by the assembling mode, and the overall stiffness of the joint assembly mode is smaller than that of the staggered joint assembly mode, and the lining structure is unstable. The ultimate bearing capacity of joint assembly mode is the lowest, and the critical instability displacement is the largest. The failure stage of the segment lining structure rapidly enters into the stage of instability after the macroscopic failure of the segment lining structure. The failure of the bearing capacity is sudden, and the damage of the lining structure is the most serious. The staggered joint assembly improves the ultimate bearing capacity of the segment lining structure. The process from the local macroscopic crack to the overall instability of the structure is longer, and it has obvious gradual characteristics, among which, the initial unstable load of the staggered joint assembly mode CF2 is the largest. The critical instability displacement is the smallest, and the gradual failure process is obvious, which is beneficial to the demand of bearing and waterproof of segment lining structure.
【作者单位】： 西南交通大学交通隧道工程教育部重点实验室;
【基金】：国家自然科学基金面上项目(51578461,51278424)
【分类号】：U455.43
本文编号：2224040
[Abstract]:The piecewise assembling method usually includes two kinds of forms: joint assembly and staggered joint assembly, which are used in different projects, and the different assembling methods directly cause the difference in the structure system of segment lining. Under the same load conditions, there are significant differences in the stress and failure patterns of the structure. Taking Liaoyang Tunnel as the engineering background and adopting the similar model test method, the influence of different assembling methods on the mechanical properties and failure characteristics of segment lining structure is comparatively analyzed. The experimental results show that the mechanical properties and failure modes of segment lining structure are significantly affected by the assembling mode, and the overall stiffness of the joint assembly mode is smaller than that of the staggered joint assembly mode, and the lining structure is unstable. The ultimate bearing capacity of joint assembly mode is the lowest, and the critical instability displacement is the largest. The failure stage of the segment lining structure rapidly enters into the stage of instability after the macroscopic failure of the segment lining structure. The failure of the bearing capacity is sudden, and the damage of the lining structure is the most serious. The staggered joint assembly improves the ultimate bearing capacity of the segment lining structure. The process from the local macroscopic crack to the overall instability of the structure is longer, and it has obvious gradual characteristics, among which, the initial unstable load of the staggered joint assembly mode CF2 is the largest. The critical instability displacement is the smallest, and the gradual failure process is obvious, which is beneficial to the demand of bearing and waterproof of segment lining structure.
【作者单位】： 西南交通大学交通隧道工程教育部重点实验室;
【基金】：国家自然科学基金面上项目(51578461,51278424)
【分类号】：U455.43
【相似文献】
相关期刊论文 前4条
1 李翔宇;李明宇;冯雷;;软土地区通缝拼装盾构隧道纵向变形特征[J];沈阳建筑大学学报(自然科学版);2012年03期
2 张强;杜守继;路明鉴;;盾构隧道通缝拼装管片错台的监测研究[J];地下空间与工程学报;2008年01期
3 严长征;张庆贺;王慎堂;;盾构隧道通、错缝拼装管片受力及变形比较[J];地下空间与工程学报;2007年04期
4 ;[J];;年期
相关硕士学位论文 前2条
1 张少辉;不同拼装方式下管片结构的力学行为研究[D];西南交通大学;2004年
2 张强;盾构隧道通缝拼装管片的上浮和错台研究[D];上海交通大学;2007年
，本文编号：2224040
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2224040.html
