Numerical study on structural reinforced effects of concrete lining by spray-applied waterproofing membrane

Chulho Lee; Kicheol Lee; Dongwook Kim; Soon-Wook Choi; Tae-Ho Kang; Soo-Ho Chang

doi:10.9711/ktaj.2017.19.3.551

Numerical study on structural reinforced effects of concrete lining by spray-applied waterproofing membrane

Journal of Korean Tunnelling and Underground Space Association ◽

10.9711/ktaj.2017.19.3.551 ◽

2017 ◽

Vol 19 (3) ◽

pp. 551-565

Author(s):

Chulho Lee ◽

Kicheol Lee ◽

Dongwook Kim ◽

Soon-Wook Choi ◽

Tae-Ho Kang ◽

...

Keyword(s):

Numerical Study ◽

Concrete Lining ◽

Waterproofing Membrane

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A Numerical study on the Moisture Transport of Concrete Tunnel Linings with the Sprayable Waterproofing Membrane

Tunnel and Underground Space ◽

10.7474/tus.2016.26.3.212 ◽

2016 ◽

Vol 26 (3) ◽

pp. 212-219

Author(s):

Chulho Lee ◽

Soon-Wook Choi ◽

Tae-Ho Kang ◽

Soo-Ho Chang

Keyword(s):

Moisture Transport ◽

Numerical Study ◽

Waterproofing Membrane

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Mechanical behaviour of a sprayed concrete lining isolated by a sprayed waterproofing membrane

Tunnelling and Underground Space Technology ◽

10.1016/j.tust.2015.01.004 ◽

2015 ◽

Vol 47 ◽

pp. 143-152 ◽

Cited By ~ 13

Author(s):

Masanari Nakashima ◽

Anna-Lena Hammer ◽

Markus Thewes ◽

Mohammed Elshafie ◽

Kenichi Soga

Keyword(s):

Mechanical Behaviour ◽

Concrete Lining ◽

Sprayed Concrete ◽

Waterproofing Membrane

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Numerical Study on Evaluating the Concrete-Bedrock Interface Condition for Hydraulic Tunnel Linings Using the SASW Method

Applied Sciences ◽

10.3390/app8122428 ◽

2018 ◽

Vol 8 (12) ◽

pp. 2428 ◽

Cited By ~ 1

Author(s):

Xiulin Li ◽

Xiaobin Lu ◽

Meng Li ◽

Jutao Hao ◽

Yao Xu

Keyword(s):

Numerical Study ◽

Contact Condition ◽

Interface Condition ◽

Concrete Lining ◽

Fast Fourier Transformation ◽

In Situ Tests ◽

Weak Layer ◽

The Impact ◽

Impact Duration

The current methods for evaluating the contact condition between concrete and lining were the ground penetrating radar (GPR) and the coring method. The penetration of radar electromagnetic waves was greatly affected by steel reinforcement and water, which often made the detection results of GPR unsatisfactory. A spectral analysis of the surface wave (SASW) method was used to evaluate the concrete-bedrock interface condition for hydraulic tunnel linings in this paper, since the impact elastic wave is less affected by steel bars and water content. An SASW implementation program based on fast Fourier transformation (FFT) was developed to analyze data from numerical simulations and field tests. Various models were studied to investigate the feasibility of using numerical analysis. For the first time, the study was employed to find out the influences of different receiver spacings and impact duration on the efficiency of detecting the existence of a weak layer underneath the concrete using the SASW method. On this basis, in-situ tests were carried out to verify the applicability in the field and results were verified by coring. In the research, the following results were found: (1) The finite element analysis results of different uniform or layered models showed that the SASW method could accurately identify the interface contact condition between the concrete lining and bedrock, especially the existence of voids; (2) when the receiver spacing was 1.0–1.5 times the thickness of the target object to be inspected, the quality of the collected signal data was the best; (3) under a certain reasonable range, the impact duration had an insignificant effect on the phase spectra and dispersion curves of a concrete-weak layer model; (4) in-situ SASW inspection could accurately tell whether the voids exist at the concrete-bedrock interface; and (5) the data processing program of the SASW method based on the MATLAB platform was accurate, convenient, and worth promoting.

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