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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Tunnelling and Underground Space Association
Journal Basic Information
Journal DOI :
Korean Tunnelling and Underground Space Association (KTA)
Editor in Chief :
Volume & Issues
Volume 14, Issue 6 - Nov 2012
Volume 14, Issue 5 - Sep 2012
Volume 14, Issue 4 - Jul 2012
Volume 14, Issue 3 - May 2012
Volume 14, Issue 2 - Mar 2012
Volume 14, Issue 1 - Jan 2012
Selecting the target year
A study on use of quantitative risk analysis on life safety performance for the effect of fixed fire fighting system at road tunnel fires
Park, Kyung-Hwan ; Yoo, Ji-Oh ;
Journal of Korean Tunnelling and Underground Space Association, volume 14, issue 1, 2012, Pages 1~22
DOI : 10.9711/KTAJ.2012.14.1.001
This paper tried to verify whether the fixed fire fighting system (FFFS) that is installed in road tunnel improves evacuation performance or not. Verification was performed according to the Disaster Prevention Facilities Installation and Management Guide at Road Tunnel. Twenty seven different fire scenarios were set up for the verification and the cases that FFFS was installed were compared with the cases that FFFS was not installed. The result of the comparison showed that the average equivalent death was reduced in 26 cases out of 27 cases when water spray extinguishing system was installed. It was confirmed that the risk when was not installed was unacceptable in Hong Kong and the Netherlands. On the other hand, it was confirmed that the risk was reduced to as low as reasonably practicable (ALARP) when was installed. The cumulative frequency of average death in case with FFFS was compared against the frequency of death without FFFS: death of one or more is about 50 times less; 10 or more is about 100 times less; and the death of more than 100 is four times less. It was verified that FFFS makes improved conditions to escape from the fires in road tunnel.
Consideration for evaluation patterns of normalized RMR parameters
Lee, Seong-Min ; Lee, Yeon-Hee ; Kim, Sun-Myung ;
Journal of Korean Tunnelling and Underground Space Association, volume 14, issue 1, 2012, Pages 23~35
DOI : 10.9711/KTAJ.2012.14.1.023
Due to the convenience, RMR has been widely applied in civil engineering works such as tunnel, slope, and so on. Many researchers have studied to suggest more simple and trustable RMR by modifying its parameters. However, those researches have just focused on looking for easy modified-RMRs by reducing number of parameters using various statistical analyses. Therefore, this research studied questions of modified-RMRs and gaps between RMR and its parameters. Approximately 2,000 parameters of 400 RMRs from various tunnel sites were normalized respectively and compared with one another to study their relations and divergences. The comparison results showed that there were common patterns among RMR and parameters. Data of uniaxial compressive strength and RQD, qualitative parameters, were located in upper side of RMR line. Discontinuity condition and ground water, quantitative oriented parameters, were opposite to them. It means if both qualitative and quantitative parameters can be properly combined then it can be easy to make simple and easy modified-RMRs without using difficult statistics. This results also show that the majority of field engineers used to estimate RMR conservatively when they did quantitative oriented parameters.
A case study on a tunnel back analysis to minimize the uncertainty of ground properties based on artificial neural network
You, Kwang-Ho ; Song, Won-Young ;
Journal of Korean Tunnelling and Underground Space Association, volume 14, issue 1, 2012, Pages 37~53
DOI : 10.9711/KTAJ.2012.14.1.037
There is considerable uncertainty in ground properties used in tunnel designs. In this study, a back analysis was performed to find optimal ground properties based on the artificial neural network facility of MATLAB program of using tunnel monitoring data. Total 81 data were constructed by changing elastic modulus and coefficient of lateral pressure which have great influence on tunnel convergence. A sensitivity analysis was conducted to establish an optimal training model by varying the number of hidden layers, the number of nodes, learning rate, and momentum. Meanwhile, the optimal training model was selected by comparing MSE (Mean Squared Error) and coefficient of determination (
) and was used to find the correct elastic moduli of layers and the coefficient of lateral pressure. In future, it is expected that the suggested method of this study can be applied to determine the optimum tunnel support pattern under given ground conditions.
Effect of utilizing pressurized ring beam system in modern rock TBM: I. Numerical study
Kwak, Yun-Suk ; Kang, Gi-Don ; Kim, Do-Hoon ; Lee, In-Mo ;
Journal of Korean Tunnelling and Underground Space Association, volume 14, issue 1, 2012, Pages 55~77
DOI : 10.9711/KTAJ.2012.14.1.055
A Modern Rock TBM is a tunnel excavation method combining the conventional tunnelling method with the mechanized tunnelling method. It is a hybrid system that excavates a tunnel with TBM and supports the ground by ring beam, wire mesh, rock bolt, shotcrete, i.e., conventional tunnelling method. In the Modern Rock TBM, a ring beam is similar to a steel rib in NATM in the way that uses H-beam. But using a ring beam is more effective than a steel rib because it is installed in a closed-circle. Therefore, improving the performance of the ring beam is a key factor for achieving tunnel stability. In this respect, this study introduces a pressurized ring beam that might be functioning more effectively by confining convergence during tunnel excavation. In order to verify the effect of the pressurized ring beam, a three-dimensional numerical analysis was conducted. The numerical analysis confirms an increase in the minimum principal stress and reduction in the plastic strain that triggers excessive displacement. The analysis result also indicates a decrease in the relative displacement occurring after installing the ring beam, and expansion in spacing between the ring beams.
A study on chemical bonding characteristics of the interface between curved FRP panels for consecutive structural assembly
Lee, Gyu-Phil ; Shin, Hyu-Soung ; Jung, Woo-Tai ;
Journal of Korean Tunnelling and Underground Space Association, volume 14, issue 1, 2012, Pages 79~91
DOI : 10.9711/KTAJ.2012.14.1.079
A curved fiber reinforced polymer (FRP) panel is produced with a certain width depending on allowances of manufacturing processes and facilities. An targeted arch-shaped structure could be built by sequential connection of series of the FRP panels. The connection manner between the FRP panels could be given by chemical treatment, mechanical treatment and hybrid method. Among those, the connection between the panels by chemical treatment is commonly adopted. Therefore, For an optimized design of the connected part between FRP pannels, a number of direct shear tests have been undertaken in terms of a number of parameters: surface treatment conditions, bonding materials, etc.. As results, surface grinding condition by sand paper or surface treatment by sand blasting appear properly acceptable methods, and epoxy and acryl resins are shown to be effective bonding materials for the purpose in this study.
Evaluation of daylighting performance of bar-type mirror reflector system in tunnel
Lee, Beom-Seok ; Joo, Jae-Sung ; Jeong, In-Young ; Kim, Min-Sung ;
Journal of Korean Tunnelling and Underground Space Association, volume 14, issue 1, 2012, Pages 93~105
DOI : 10.9711/KTAJ.2012.14.1.093
The basic study was preceded for reducing maintenance and power cost of lighting fixture applying daylighting because most of the tunnel lighting depend on the artificial lighting. This study aims to evaluate the daylighting performance of daylighting performance of bar-type mirror reflector system in tunnel. Illuminance and luminance was measured. As a result of horizontal illuminance measurements, it was satisfied in tunnel recommended illuminance (KSA 3703) that total average was 1,170 lx increased 6.5 times more than this system was not used. Also, as a result of evaluating driver`s glare on the opposite lane, glare did not occur and the luminance ratio was 3.01 which satisfies the luminance ratio standard 10.