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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Tunnel and Underground Space
Journal Basic Information
Journal DOI :
Korean Society for Rock Mechanics
Editor in Chief :
Volume & Issues
Volume 26, Issue 4 - Aug 2016
Volume 26, Issue 3 - Jun 2016
Volume 26, Issue 2 - Apr 2016
Volume 26, Issue 1 - Feb 2016
Selecting the target year
Analysis of Features and Applications of Bluetooth Beacon Technology for Utilization in the Mining and Construction Industries
Jung, Jihoo ; Baek, Jieun ; Choi, Yosoon ;
Tunnel and Underground Space, volume 26, issue 3, 2016, Pages 143~153
DOI : 10.7474/TUS.2016.26.3.143
This study analyzed the features and various applications of Bluetooth beacon technology for utilization in the mining and construction industries. Through a literature survey, the concept and version-specific features of Bluetooth were reviewed, and representative types of the Bluetooth beacon-based service and its real-world applications in other fields were analyzed. Although a few previous studies that used the Bluetooth Classic (the old version of Bluetooth technology) in the mining industry have been reported, no mine site could be found where the Bluetooth beacon technology was utilized. In the construction industry, this study could find a site where the Bluetooth beacon technology was used to improve the haulage works of construction raw materials. Since the Bluetooth beacon technology has low power consumption and is easy to integrate with smartphones, it will be effectively utilized to improve the productivity and safety in the mining and construction industries.
Variation of Rock Properties in Acidic Solution and Loading Condition
Chung, Jae Hong ; Park, Seung Hun ; Lee, Seung Jun ; Yu, Seungwon ; Lee, Woo Hee ; Kwon, Sangki ;
Tunnel and Underground Space, volume 26, issue 3, 2016, Pages 154~165
DOI : 10.7474/TUS.2016.26.3.154
This paper presents experimental results to investigate the affects of acidic solution under loading condition on rock properties. In the experiment, the variations of various rock properties including effective porosity, thermal conductivity, and etc were investigated with different pHs of solution and magnitudes of loading. The results show that the rock property change was increased with low pH under loading. It was predicted that chemical reaction rate would be increased in low pH. Below the crack initiation stress of the rock specimen, the variation of rock property change was reduced with increased loading. It could be explained with the reduced chemical reaction area by the compressional loading if there is no crack generation.
Coupled Hydrological-mechanical Behavior Induced by CO
Injection into the Saline Aquifer of CO2CRC Otway Project
Park, Jung-Wook ; Shinn, Young Jae ; Rutqvist, Jonny ; Cheon, Dae-Sung ; Park, Eui-Seob ;
Tunnel and Underground Space, volume 26, issue 3, 2016, Pages 166~180
DOI : 10.7474/TUS.2016.26.3.166
The present study numerically simulated the CO2 injection into the saline aquifer of CO2CRC Otway pilot project and the resulting hydrological-mechanical coupled process in the storage site by TOUGH-FLAC simulator. A three-dimensional numerical model was generated using the stochastic geological model which was established based on well log and core data. It was estimated that the CO2 injection of 30,000t over a period of 200 days increased the pressure near the injection point by 0.5 MPa at the most. The pressure increased rapidly and tended to approach a certain value at an early stage of the injection. The hydrological and mechanical behavior observed from the CO2 flow, effective stress change and stress-strength ratio revealed that the CO2 injection into the saline aquifer under the given condition would not have significant effects on the mechanical safety of the storage site and the hydrological state around the adjacent fault.
An Analysis of Pore Network of Drilling Core from Pohang Basin for Geological Storage of CO
Park, Jihwan ; Park, Hyeong-Dong ;
Tunnel and Underground Space, volume 26, issue 3, 2016, Pages 181~191
DOI : 10.7474/TUS.2016.26.3.181
In geological storage of
, the behavior of
is influenced by pore network of rock. In this study, the drilling cores from Pohang Basin were analyzed quantitatively using three-dimensional images acquired by X-ray micro computed tomography. The porosities of sandstone specimens around 740 m-depth (T1), 780 m-depth (T2) and 810 m-depth (T3) which were target strata were 25.22%, 23.97%, 6.28%, respectively. Equivalent diameter, volume, area, local thickness of pores inside the sandstone specimens were analyzed. As a result, the microstructural properties of T1 and T2 specimens were more suitable for geological storage of
than those of T3 specimens. The result of the study can be used as input data of the site for decision of injection condition, flow simulation and so on.
Behavior of the Segment Lining due to the Middle Slab and the Lateral Pressure Coefficient in Duplex Tunnel
Lee, Ho Seong ; Moon, Hyun Koo ;
Tunnel and Underground Space, volume 26, issue 3, 2016, Pages 192~200
DOI : 10.7474/TUS.2016.26.3.192
We analyzed the behavior of the lining segments considering the middle slab and lateral pressure coefficients when planning the construction of a duplex tunnel for the underground network. Reviewed segment lining analysis for research, the analytical model was determined for duplex tunnel. Also reviewed the vertical load, and a load of middle slab is considered the static load and the live load by vehicles. Section force by middle slabs a load applied was mainly generated in the lower tunnel had the greatest effect on the bending moment. In addition, the bending moment acting direction changes appeared with a large variable, and the section force according to the load applied to the middle slab is relatively constant and the effect on the segment lining from the smallest section force of the lateral pressure coefficient of 1.00 was found to occur appears most significantly. As a result of this research to identify the behavior of the slab and the segment lining by the effect of the lateral pressure coefficient (K) of the duplex tunnel will be able to present a method of the duplex tunnel structure is reasonable and economical design.
Estimation of Joint Size Distribution Using a Contained Trace Length Distribution in a Cylindrical Window
Suh, Ga Hyun ; Song, Jae-Joon ;
Tunnel and Underground Space, volume 26, issue 3, 2016, Pages 201~211
DOI : 10.7474/TUS.2016.26.3.201
A method for estimating rock joint size distribution using contained traces length distribution from 3D cylindrical window survey was suggested. To reduce the numerical error, an improved technique was applied. The accuracy was verified by referring to Monte-Carlo simulation and it was found that the error can be decreased with suitable gamma values.
A Numerical study on the Moisture Transport of Concrete Tunnel Linings with the Sprayable Waterproofing Membrane
Lee, Chulho ; Choi, Soon-Wook ; Kang, Tae-Ho ; Chang, Soo-Ho ;
Tunnel and Underground Space, volume 26, issue 3, 2016, Pages 212~219
DOI : 10.7474/TUS.2016.26.3.212
The sprayable waterproofing membrane is installed between shotcrete to provide crack bridging and hence prevent flow of liquid water as a waterproofing system. Because of its material characteristics, the sprayable membrane can be constructed at more complex structure than sheet membrane. The main component of the sprayable waterproofing membrane is a polymer-based material, therefore, moisture can migrate through sprayable waterproofing membrane materials by capillary and vapor diffusion mechanisms. The moisture transport mechanisms can have an influence on the degree of saturation and may influence the pore pressure and risk of freeze-thaw damage on concrete linings and membrane. In this study, long-term hygrothermal behavior was simulated with considering moisture transport and long-term effects on saturation of tunnel linings. From the simulation, due to water absorption and vapor transport properties of sprayable membrane, change of relative humidity and water content in tunnel lining can be evaluated.
An Experimental Study on Fundamental Properties of a Sprayable Waterproofing Membrane
Chang, Soo-Ho ; Kang, Tae-Ho ; Choi, Soon-Wook ; Lee, Chulho ; Hwang, Gwi-Sung ; Choi, Myung-Sik ;
Tunnel and Underground Space, volume 26, issue 3, 2016, Pages 220~234
DOI : 10.7474/TUS.2016.26.3.220
Sprayable waterproofing membrane has been considered as a substitute for a sheet waterproofing membrane in a variety of underground excavation works. However, fundamental properties of sprayble waterproofing membrane have not been fully given yet. In this study, a new two-component sprayable waterproofing membrane prototype was developed. In addition, its physico-mechanical properties were measured and compared with those of two kinds of thin spray-on liners where constitutive materials and construction methods are very close to each other. From direct tensile tests, the sprayable waterproofing membrane with elongations at break between 250% and 300% showed much higher ductility than TSLs. However, the sprayable waterproofing membrane had a limitation as a support member since its bond strength and loading capacity was lower than those of TSLs. From three-dimensional X-ray CT images, the porosity of the sprayable waterproofing membrane was estimated to be 26.13%. However, most of pores which might have been generated during membrane curing were not observed to be interconnected but isolated.
Polygonal Grain-Based Distinct Element Modelling of Mechanical Characteristics and Transverse Isotropy of Rock
Park, Jung-Wook ; Park, Chan ; Ryu, Dongwoo ; Choi, Byung-Hee ; Park, Eui-Seob ;
Tunnel and Underground Space, volume 26, issue 3, 2016, Pages 235~252
DOI : 10.7474/TUS.2016.26.3.235
This study presents a methodology to reproduce the mechanical behavior of isotropic or transversely isotropic rock using the polygonal grain-based distinct element model. A numerical technique to monitor the evolution of micro-cracks during the simulation was developed in the present study, which enabled us to examine the contribution of tensile cracking and shear cracking to the progressive process of the failure. The numerical results demonstrated good agreement with general observations from rock specimens in terms of the behavior and the evolution of micro-cracks, suggesting the capability of the model to represent the mechanical behavior of rock. We also carried out a parametric study as a fundamental work to examine the relationships between the microscopic properties of the constituents and the macroscopic behavior of the model. Depending on the micro-properties, the model exhibited a variety of responses to the external load in terms of the strength and deformation characteristics. In addition, a numerical technique to reproduce the transversely isotropic rock was suggested and applied to Asan gneiss from Korea. The behavior of the numerical model was in good agreement with the results obtained in the laboratory-scale experiments of the rock.