Full-scale Experimental Study on Mechanical Behavior of the Bundled Integrate Structure under the Unloading Condition of the Side

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Abstract In order to study the structural mechanical properties and weak points of the bundled integrate structure, a full-scale test on the quarter structure had been conducted. The unloading condition of the side was studied by keeping the top load corresponding to 4 times of the design buried depth. The results showed that: (1)With the increase of the load difference between the upper and the side, the joint at the side was detached, the overall stiffness of the structure decreased by 87%, and the joint opening, structural deformation and prestressed tendon strain increased significantly. (2) After the side part was completely unloaded, the structure had obvious deformation, but it still had a certain bearing capacity. (3) In the whole process of the experiment, the structural stiffness first decreased, then increased and finally decreased substantially. The final stiffness was only 36% of the initial stiffness.

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	BI Xiangli1 WANG Xiuzhi1 ZHANG Zhongjie2 PAN Weiqiang3 JIAO Bochang4 LIU Xian4

Keywords： Bundled integrate structure Transverse prestress Full scale test Mechanical property

Abstract： In order to study the structural mechanical properties and weak points of the bundled integrate structure, a full-scale test on the quarter structure had been conducted. The unloading condition of the side was studied by keeping the top load corresponding to 4 times of the design buried depth. The results showed that: (1)With the increase of the load difference between the upper and the side, the joint at the side was detached, the overall stiffness of the structure decreased by 87%, and the joint opening, structural deformation and prestressed tendon strain increased significantly. (2) After the side part was completely unloaded, the structure had obvious deformation, but it still had a certain bearing capacity. (3) In the whole process of the experiment, the structural stiffness first decreased, then increased and finally decreased substantially. The final stiffness was only 36% of the initial stiffness.

Keywords： Bundled integrate structure, Transverse prestress, Full scale test, Mechanical property

Cite this article:

BI Xiangli1 WANG Xiuzhi1 ZHANG Zhongjie2 PAN Weiqiang3 JIAO Bochang4 LIU Xian4 .Full-scale Experimental Study on Mechanical Behavior of the Bundled Integrate Structure under the Unloading Condition of the Side[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(5): 163-169

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