沉管隧道管节接头混凝土剪力键压剪破坏试验研究

发布时间：2018-01-03 17:14

本文关键词：沉管隧道管节接头混凝土剪力键压剪破坏试验研究　出处：《工程力学》2017年03期 　论文类型：期刊论文

【摘要】：接头是沉管隧道中最薄弱的一环,在受到地震和不均匀沉降等作用下,接头会发生横向变形,并通过接头中的剪力键传递。目前,国内外沉管隧道管节接头变形规律的研究较少集中在剪力键上,更缺少管节接头整体力学性能试验数据的支持。根据沉管隧道接头构造设计特点,该文提出了一套测试接头压剪承载力和破坏模式的破坏试验方法和加载方案,并开展了几何比尺为1∶10的管节接头压剪试验,研究接头在低周往复剪切荷载下的力学性能,记录其荷载-位移曲线,最终获得接头压剪刚度曲线。试验结果表明,管节接头和单个剪力键的承载力分别是310 k N/355 k N(正/负向)和88 k N,均比设计承载力高。而接头剪力键的破坏模式主要表现为局部翘曲破坏和凸榫根部拉裂破坏。
[Abstract]:The joint is the weakest link in the immersed tunnel. Under the action of earthquake and uneven settlement, the joint will undergo transverse deformation and be transmitted through the shear bond in the joint. At present. At home and abroad, the research on deformation law of pipe joint joint in immersed tunnel is less focused on shear key, and more lack of the support of the test data of integral mechanical properties of pipe joint, according to the structural design characteristics of immersed tube tunnel joint. In this paper, a set of failure test methods and loading schemes for testing the compressive shear capacity and failure mode of the joints are presented, and the compression shear tests of the joints with a geometric scale of 1:10 are carried out. The mechanical properties of joints under low cycle reciprocating shear loads were studied, and the load-displacement curves were recorded. Finally, the compressive shear stiffness curves of joints were obtained. The bearing capacity of the joint and single shear bond is 310 K N / 355 k N (positive / negative) and 88 KN, respectively. The failure mode of joint shear bond is mainly local warping failure and tenon root crack failure.
【作者单位】：同济大学土木工程国家重点实验室;同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;中交公路规划设计院有限公司;
【基金】：国家自然科学基金项目(51208296,51478343) 上海市科学技术委员会项目(13231200503) “十一五”国家科技支撑计划项目(2011BAG07B01)
【分类号】：U459.5
【正文快照】： 随着国家基础设施建设的推进,我国隧道工程涌现出越来越多的沉管隧道,例如港珠澳大桥岛隧工程[1]等,其安全性问题也日益受到重视。接头是沉管隧道中最薄弱且非常关键的环节[2 3],其力学性能的研究至关重要。沉管隧道在遭受地震作用或不均匀沉降等荷载下,接头会产生横向变形和

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