Comparative model study on test of underground diaphragm wall and cross plate joint under transverse bending
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摘要: 地下连续墙是常用的深基坑支护结构，近年来格形地连墙在港口、码头工程中广泛应用，其接头部分是地下连续墙的薄弱部位，而关于地连墙接头在水平荷载下受力状态的研究相对较少，因此具有现实研究意义。通过模型试验对比了无接头部分与十字板接头地连墙的受弯破坏过程及形态，发现十字板接头地连墙受弯承载力较低，且受拉侧易开裂，当接近极限荷载时，钢板与混凝土连接处将发生脆性破坏，表明十字板接头平面外受弯能力较低，宜视为铰接点，其应用范围有限。Abstract: Underground diaphragm walls are common support structures for deep foundation pits. With the widespread application of lattice ground connecting walls in port and wharf engineering in recent years, the research significance of its out-of-plane force has become more prominent. The joint section of the underground diaphragm wall, being its weakest part, has been extensively studied under transverse bending. However, there has been less research on its bending behavior under horizontal loads. Model tests were conducted to compare the bending failure process and shape of the ground wall with the non-joint part and the cross-plate joint. Results reveal that the bending bearing capacity of the diaphragm wall with the cross plate joint is low, and the tensile side is prone to cracking. When approaching the ultimate load, brittle failure occurs at the interface between the steel plate and concrete. The phenomenon shows that the cross plate joint should be regarded as hinge point because of its low bending ability outside the plane, and its application range is limited.
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Key words:
- diaphragm wall /
- cross plate joint /
- bending bearing capacity /
- model test /
- transverse bending
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