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Development and Application of Test Loading System of Multi-ring Shield Segment Prototype
(1. Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015; 2. Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Hangzhou 310015; 3. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058; 4. School of Civil Engineering, Shaoxing University, Shaoxing 312000; 5. Yantai XTD Test Technology Co. Ltd, Yantai 264000)
Abstract To address the various problems related to shield segments, such as the impossibility of real simulation of the stress of shield segments with the extant segment testing system and the low sustainable utilization rate of equipment, this paper carries out preliminary research on and theoretical calculation and on-site measurement of shield tunnel segments with the objective to make further improvement to existing tests of large full-scale segments. This paper proposes a new full-scale test loading method for shield segments and innovatively develops a multi-ring prototype test loading system of shield segments. This system takes three-ring lining segments as the test subject and simulates the stress and deformation of the middle-ring segment under different working conditions of ground eccentric stacked loads. The test results show that the value of the bending moment of the segment increases with the increasing eccentric load, and the range of the positive bending moment region at the bottom is about twice the positive bending moment region at the top. Also, the efficiency of the bending stiffness of the segment increases linearly,while the bending moment transmission coefficient of the joint keeps decreasing, and the segment will be deflected as a whole under the eccentric load.
Abstract：
To address the various problems related to shield segments, such as the impossibility of real simulation of the stress of shield segments with the extant segment testing system and the low sustainable utilization rate of equipment, this paper carries out preliminary research on and theoretical calculation and on-site measurement of shield tunnel segments with the objective to make further improvement to existing tests of large full-scale segments. This paper proposes a new full-scale test loading method for shield segments and innovatively develops a multi-ring prototype test loading system of shield segments. This system takes three-ring lining segments as the test subject and simulates the stress and deformation of the middle-ring segment under different working conditions of ground eccentric stacked loads. The test results show that the value of the bending moment of the segment increases with the increasing eccentric load, and the range of the positive bending moment region at the bottom is about twice the positive bending moment region at the top. Also, the efficiency of the bending stiffness of the segment increases linearly,while the bending moment transmission coefficient of the joint keeps decreasing, and the segment will be deflected as a whole under the eccentric load.
WEI Gang1,
2 ZHOU Xinxin3 LIU Yayu4 HUANG Shiyu3,
5 FENG Feifan3
.Development and Application of Test Loading System of Multi-ring Shield Segment Prototype[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(4): 176-186
2022, Vol. 59 