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Quality Inspection Research of Subway Shield Lining Segment

Author: LvQingShan
Tutor: LiLiXin；ChenTao
School: Shenyang University of construction
Course: Structural Engineering
Keywords: Shield Tunnel Lining Tube Crack Analysis Load program comparison Positive moment analysis
CLC: U455.43
Type: Master's thesis
Year: 2011
Downloads: 124
Quote: 0
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Abstract


In recent years, with the acceleration of the process of social and economic development and urbanization, the rapid growth of urban population, ground transportation is difficult to meet the development needs of the large-scale development of underground space, the construction of the underground tunnel has become an important means to ease the traffic pressure, shield construction because of its automation and control, low labor intensity, high precision construction boring fast, high economic conditions become the main way for underground construction. Thus their quality pipe piece directly affect the speed of the advance of the shield machine, tunnel molding quality and durability of tunnel use. Segment boundary constraints and segment the mechanical properties of test methods are the light of foreign experience. These methods, however, just as conventional segment production allow certificate or acceptance of the the reference conditions allow permit, not as segment production quality control means, coupled with domestic tube piece quality inspection method to regulate the formation of a unified standard, and can not guarantee the subway quality segment. Therefore, for shield lining piece quality research has far-reaching significance. Given the current domestic subway lining segments cracking situation was very serious, the detection method of loading to be discussed, the degree of consolidation in the segment between its carrying capacity can not wait to need to be addressed, the subway shield lining analysis of the cracking of the tube sheet on how to improve the quality of Lining Tube pave the way for the tube piece quality, depending on the load the next segment by exploring what load method better later Lining Tube detection provide the basis for better ways to analyze the actual force from the degree of consolidation of the end bearing capacity of Lining Tube. The crack extension first appeared around the grouting hole and center bolt hole, heavier pipe piece than ordinary tube sheet pressure is good, but to achieve the ultimate load heavier segment cracking undermine the situation is more serious than ordinary pipe piece Lining Tube segment strength; cracking mainly in the upper part of the segment rings, should focus on strengthening withstand the pressure of the upper soil three points closer to the actual situation of the average soil pressure load, the measured data of the three-point loading method measured data than the two-point loading method Lining Tube deflection under three load to be too large, larger than the two points Lining Tube deflection under load, the same pressure deflection larger than the two deflection under load; better consolidation of the end smaller deflection change, the greater the carrying capacity, consolidation bad when unloading pipe piece big deflection can not rebound to its destruction also larger than when laid flat.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Construction methods > Shield Law ( full- face excavation )
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