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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 25, Issue 6 - Dec 2015
Volume 25, Issue 5 - Oct 2015
Volume 25, Issue 4 - Aug 2015
Volume 25, Issue 3 - Jun 2015
Volume 25, Issue 2 - Apr 2015
Volume 25, Issue 1 - Feb 2015
Selecting the target year
Current Status of Research on Thermal and Mechanical Properties of Rock under High-Temperature Condition
Lee, Changsoo ; Park, Jung-Wook ; Park, Chulwhan ; Park, Eui-Seob ;
Tunnel and Underground Space, volume 25, issue 1, 2015, Pages 1~23
DOI : 10.7474/TUS.2015.25.1.001
In this technical report we summarize the observational data on thermal and mechanical properties of rocks reported by over 70 best published papers. The experimental results reported individually are integrated and presented in tables and figures here, which will provide fundamental data to fairly determine and evaluate the rock properties at the initial design stage of underground structures exposed to high temperature environment.
The Mechanical Properties of the Geochang Granite
Kim, Myeong Kyun ;
Tunnel and Underground Space, volume 25, issue 1, 2015, Pages 24~36
DOI : 10.7474/TUS.2015.25.1.024
The Geochang granite widely used in construction works is one of the most popular dimension stones in Korea. In order to evaluate the physical properties of rock, a lot of laboratory tests for the Geochang granite were conducted to find unit weight, absorption ratio, P wave velocity, S wave velocity, uniaxial compressive strength, Young's modulus, Poisson's ratio, tensile strength, cohesion, friction angle and point load strength index. The uniaxial compressive strength of the Geochang granite was 19.5 times tensile strength and also 8.6 times cohesion, besides P wave velocity was 1.5 times S wave velocity. Correlation analyses were also conducted to find the correlation among 11 different physical properties, where the uniaxial compressive strength showed Pearson correlation coefficient of more than 0.8 with Poisson's ratio, point load strength index and Young's modulus, respectively. Regression analyses were finally conducted by means of both linear and multiple analysis and the brief results including coefficient of determination of more than 0.7 were presented.
The Analysis of Rainwater Storage Facility Project for the Urban Disaster Prevention in Busan and its Countermeasures
Hwang, Jae-Yun ;
Tunnel and Underground Space, volume 25, issue 1, 2015, Pages 37~45
DOI : 10.7474/TUS.2015.25.1.037
Recently, many cities have always been affected by large natural disasters such as floods and landslides. As climate change causes more frequent localized heavy rains exceeding the conveyance capacity of sewer, flood damage is expected to increase. For the sake of reducing the urban flood damage by changed rainfall, there has been many trials on installation of runoff-reducing facilities. Therefore, it was required to study about reasonable analysis and countermeasure of rainwater storage facility project for extending it. This study was to review the status of rainwater storage facility project for the urban disaster prevention in Busan, to find out problems, and to propose the countermeasure of rainwater storage facility project for the urban disaster prevention.
Experiment and Evaluation of Mist Diffusion from Water Tube for Blasting Dust Control in accordance with the Explosives Position
Yang, Hyung-Sik ; Ko, Young-Hun ; Kim, Jung-Gyu ; Noh, You-Song ; Park, Hoon ; Cho, Sang-Ho ;
Tunnel and Underground Space, volume 25, issue 1, 2015, Pages 46~55
DOI : 10.7474/TUS.2015.25.1.046
A water tube with detonating cord was devised to control the blast dust. Water diffusion experiments with different detonating cord positions were conducted during the series of experiments to optimize the design parameters of the tube. Images from high speed camera were analyzed to evaluate the results. AUTODYN program was adopted to simulate the diffusion process of water and compared with the images. Diffusion of water shows cross flow in case of external charge while the internal case shows radial flow. A bubble ring was formed during the numerical analysis of internal charge case as occurred in underwater blast. An additional bubble ring was formed by the reflection pressure from the ground. And the Weber number was determined as sufficient for spray atomization performance of the water tube.
Experimental Study on Source Locating Technique for Transversely Isotropic Media
Choi, Seung-Beum ; Jeon, Seokwon ;
Tunnel and Underground Space, volume 25, issue 1, 2015, Pages 56~67
DOI : 10.7474/TUS.2015.25.1.056
In this study, a source locating technique applicable to transversely isotropic media was developed. Wave velocity anisotropy was considered based on the partition approximation method, which simply enabled AE source locating. Sets of P wave arrival time were decided by the two-step AIC algorithm and they were later used to locate the AE sources when having the least error compared with the partitioned elements. In order to validate the technique, pencil lead break test on artificial transversely isotropic mortar specimen was carried out. Defining the absolute error as the distance between the pencil lead break point and the located point, 1.60 mm ~ 14.46 mm of range and 8.57 mm of average were estimated therefore it was regarded as thought to be 'acceptable' considering the size of the specimen and the AE sensors. Comparing each absolute error under different threshold levels, results showed small discrepancies therefore this technique was hardly affected by background noise. Absolute error could be decomposed into each coordinate axis error and through it, effect of AE sensor position could be understood so if optimum sensor position was able to be decided, one could get more precise outcome.
Stability and Deformation Analysis Considering Discontinuities in Rock Mass
Hwang, Jae-Yun ;
Tunnel and Underground Space, volume 25, issue 1, 2015, Pages 68~75
DOI : 10.7474/TUS.2015.25.1.068
Rock mass includes such discontinuities as fault, joint, bedding, crack, schistosity, cleavage. The rock mass behavior, therefore, is influenced by the discontinuity behavior. In this study, a stability and deformation analysis method considering discontinuities in rock mass is proposed, and then applied to the rock collapse disaster site. As the method, the stability analysis by the stereographic projection method was carried out in an actual site, the deformation analysis program by the finite element method including the joint element was developed, and performed. To demonstrate the applicability of this developed stability and deformation analysis method considering discontinuities in rock mass, the analysis results are examined and compared with the failure behavior at the rock mass.
Development of a New Software to Analyze Displacement and Predict Failure Time of the Rock Slope
Noh, Young-Hwan ; Um, Jeong-Gi ;
Tunnel and Underground Space, volume 25, issue 1, 2015, Pages 76~85
DOI : 10.7474/TUS.2015.25.1.076
We have developed a software to predict failure time of the rock slope based on analysis of the data from real time displacement measurements with respect to time. The software consists of four modules that play roles in analytical methods such as inverse velocity method, log time-log velocity method, log velocity-log acceleration method and nonlinear least square method to estimate failure time. VisualBasic.NET on the MS Visual Studio platform was utilized as a development tool to efficiently implement the modules and the graphical user interface of the software. Displacement data obtained from laboratory physical model studies of plane sliding were used to explore the applicability of the software, and to evaluate the possibility of predicting potential slope failure. It seems possible to estimate failure time using developed software for sliding plane having exponential type of deformability.
A Study on Performance-based Evaluation Method for Rock Slopes : Deduction of Evaluation Factors
Lee, Jong-Gun ; Suk, Jae-Wook ; Kim, Hong-Kyoon ; Kim, Yong-Soo ; Moon, Joon-Shik ;
Tunnel and Underground Space, volume 25, issue 1, 2015, Pages 86~96
DOI : 10.7474/TUS.2015.25.1.086
In this study, the performance-based evaluation factors for rock slopes have been deducted using Delphi-method. Validity of the result was verified through factor analysis. Performance of rock slope is classified as soundness, stability and durability. Through the Delphi survey, 17 factors including discontinuity orientation are deducted for soundness, 4 factors and 3 factors are selected for stability and durability, respectively. Validation is conducted using Exploratory Factor Analysis (EFA) for 24 factors, and all factors are found to be valid. As a result of Exploratory Factor Analysis (EFA), 3-types of performance were subdivided into internal soundness, external soundness, risk, damage and durability of slopes and protection (reinforcement) facilities.
A Study on Reliability of Joint Orientation Measurements in Rock Slope using 3D Laser Scanner
Park, Sun-Hyun ; Lee, Su-Gon ; Lee, Boyk-Kyu ; Kim, Chee-Hwan ;
Tunnel and Underground Space, volume 25, issue 1, 2015, Pages 97~106
DOI : 10.7474/TUS.2015.25.1.097
We must precisely investigate the mechanical characters of rock to design rock slope safely and efficiently. But the method of clinometer has some disadvantages. So, we need a new measurement that can replace the method of clinometer. In this study, we analyze the reliability of joint orientation measurements in rock slope using the 3D laser scanner and program Split-FX that is a point cloud data analysis software. We could acquire the 495 pieces joint data through the automatic extraction of features. And we confirmed that there were some errors occurred with
of dip and
of dip direction. Generally, the method of clinometer has
error ranges of the joint orientation(dip/dip direction) that are the results of the advance research. Therefore, we analyzed the method of 3D laser scanner, and it is found to be efficient, reliable. This method is expected to mend the disadvantages of Clinometer method.
Analysis of Fire Scenarios and Evaluation of Risks that might Occur in Operation Stage of CAES Storage Cavern
Yoon, Yong-Kyun ; Ju, Eun-Hye ; Seo, Saem-Mul ; Choi, Byung-Hee ;
Tunnel and Underground Space, volume 25, issue 1, 2015, Pages 107~114
DOI : 10.7474/TUS.2015.25.1.107
This study focuses on assessing risks which might occur in operation stage of CAES storage cavern and analyzing fire scenarios for the risk that have been assessed with highest risk level. Risks in operation stage were categorized into upper risk group and lower risk group. Components of upper risk group are technical risk, facility risk and natural disaster risk. Lower risk group is composed of 11 sub-risks. 20 experts were chosen to survey questionnaires. ANP model was applied to analyze the relative importance of 11 sub-risks. Results of risk analysis were compared with risk criterion to set risk priorities, and the highest risk was determined to be 'occurrence of the fire within the management opening'. Three fire scenarios were developed for the highest risk level and FDS (Fire dynamics Simulator) was used to analyze these scenarios. No. 3 scenario which air blows from tunnel into outside atmosphere represented that a rate of smoke spread was the fastest among three fire scenarios and a smoke descended most quickly below the limit line of breathing. Thus, No. 3 scenario turned out to be the most unfavorable condition when operating staffs were evacuated from access tunnel.