Abstract:As a new type structure, steel shell concrete has remarkable advantages in seepage prevention, seismic resistance, quality control and so on.It has been successfully applied in civil engineering, such as, large immersed tube tunnel.Due to causes of construction technology and material performance, there are different degrees of concrete filling-incompletion in construction to affect strength, stiffness and load-bearing capacity of a structure.Aiming at evaluation problems of grouting effect of steel shell concrete tube joint structure, based on propagation characteristics of elastic wave in layered medium, combined with characteristics of steel shell concrete tube joint structure, a scanning imaging rapid evaluation method was proposed.Firstly, the basic principle, acquisition process and imaging method for the scanning imaging method were described in detail to take two parameters including filling-incompletion thickness and continuous filling-incompletion volume as evaluation indexes for grouting effect.Aiming at the quantitative evaluation problem of filling-incompletion thickness, model tests for different filling-incompletion thickness were conducted to establish the relation between filling-incompletion thickness and response energy amplification coefficient.Model tests were conducted to verify the adaptability and effectiveness of the proposed method applied in Shenzhen-Zhongshan bridge steel shell concrete tube joint immersed tunnel project.The test results showed that the area with filling-incompletion thickness being greater than 0.50 cm occupies 20% of the detection area, and it is mainly concentrated at combined components; the maximum continuous filling-incompletion volume reaches 1 042.5 cm3; so, the usual grouting form is easy to cause problems of filling-incompletion at combined components; the effectiveness of the proposed method for evaluating grouting effect is verified through presetting defects.
唐寅,车爱兰. 钢壳混凝土管节组合结构注浆效果扫描成像评价方法研究[J]. 振动与冲击, 2019, 38(21): 148-154.
TANG Yin, CHE Ailan. A scanning imaging evaluation method for grouting effect of a steel shell concrete tube joint structure. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(21): 148-154.
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