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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 24, Issue 6 - Dec 2014
Volume 24, Issue 5 - Oct 2014
Volume 24, Issue 4 - Aug 2014
Volume 24, Issue 3 - Jun 2014
Volume 24, Issue 2 - Apr 2014
Volume 24, Issue 1 - Feb 2014
Selecting the target year
Simulation of Shovel-Truck Haulage Systems in Open-pit Mines by Considering Breakdown of Trucks and Crusher Capacity
Park, Sebeom ; Choi, Yosoon ; Park, Han-Su ;
Tunnel and Underground Space, volume 24, issue 1, 2014, Pages 1~10
DOI : 10.7474/TUS.2014.24.1.001
This paper presents a case study that performed simulations on shovel-truck haulage systems in an open-pit mine by considering truck's breakdown and crusher's capacity. The SSangyoung limestone open-pit mine in Korea was selected as a study area and investigated to design the simulation algorithms. The GPSS/H simulation language is used to implement the simulation algorithms as a console application(simulator). The values of input parameters for simulator were measured by field investigation in the study area. The simulation results showed that 7 trucks can maximize the daily profit of haulage operations(i.e., 73,775 USD) when considers the frequency of trucks' breakdown as 1/40
. In addition, the crusher capacity of 1300 tph is required to improve the efficiency of shovel-truck haulage systems in the study area.
Optimal Routes Analysis of Vehicles for Auxiliary Operations in Open-pit Mines using a Heuristic Algorithm for the Traveling Salesman Problem
Park, Boyoung ; Choi, Yosoon ; Park, Han-Su ;
Tunnel and Underground Space, volume 24, issue 1, 2014, Pages 11~20
DOI : 10.7474/TUS.2014.24.1.011
This study analyzed the optimal routes of auxiliary vehicles in an open-pit mine that need to traverse the entire mine through many working points. Unlike previous studies which usually used the Dijkstra's algorithm, this study utilized a heuristic algorithm for the Traveling Salesman Problem(TSP). Thus, the optimal routes of auxiliary vehicles could be determined by considering the visiting order of multiple working points. A case study at the Pasir open-pit coal mine, Indonesia was conducted to analyze the travel route of an auxiliary vehicle that monitors the working condition by traversing the entire mine without stopping. As a result, we could know that the heuristic TSP algorithm is more efficient than intuitive judgment in determining the optimal travel route; 20 minutes can be shortened when the auxiliary vehicle traverses the entire mine through 25 working points according to the route determined by the heuristic TSP algorithm. It is expected that the results of this study can be utilized as a basis to set the direction of future research for the system optimization of auxiliary vehicles in open-pit mines.
EGS field case studies - UK Rosemanowes and Australian Cooper Basin projects
Min, Ki-Bok ; Xie, Linmao ; Kim, Hanna ; Lee, Jaewon ;
Tunnel and Underground Space, volume 24, issue 1, 2014, Pages 21~31
DOI : 10.7474/TUS.2014.24.1.021
In order to generate electricity from geothermal energy for non-volcanic region, the concept of enhanced geothermal system (EGS) is introduced which forms an artificial reservoir by injecting high pressure fluid to 5 km deep and circulating geothermal fluid through the reservoir. Demonstration studies have been conducted in various countries and regions for determining the feasibility of EGS. In this technical note, experiences, errors, and implications of EGS demonstration projects in UK Rosemanowes and Australia Cooper Basin which have been carried out since 2002 are introduced to be used for the EGS demonstration project in Korea.
A Study on Relationship Between Basic Frictional Angle and Mineral Composition for Granite Sample
Lee, Bong-Hyun ; Lee, Seung-Joong ; Choi, Sung-Oong ;
Tunnel and Underground Space, volume 24, issue 1, 2014, Pages 32~45
DOI : 10.7474/TUS.2014.24.1.032
Basic frictional angle is a parameter that can estimate shear strength of rock, and is a design parameter employed in slope stability analysis. Basic frictional angle generates various results in accordance with mineral composition, apart from rock surface roughness itself. This paper describes the correlation of basic frictional angle and mineral composition. The basic frictional angle is measured with the aid of the modified tilt testing apparatus, and its reliability is improved by the statistical method. Also, mineral composition is identified through the photographic analysis on rock specimen, and verified through the thin section analysis.
A Study on Shear Strength under Constant Normal Load Conditions by Using 3DEC
Noh, Young-Mok ; Mun, Hong-Ju ; Kim, Ki-Ho ; Jang, Won-Yil ;
Tunnel and Underground Space, volume 24, issue 1, 2014, Pages 46~54
DOI : 10.7474/TUS.2014.24.1.046
Direct shear tests have been initiated to understand the characteristics of joints which crucially affect the stability of rock mass. In this research, numerical approach in direct shear tests has been initiated using 3DEC on the basis of 3D distinct element method. Normal loads were altered in four different levels on artificial joint tests depending on the sawtooth angle and strengths on constant normal stress conditions, measuring the peak shear strength according to the direct shear tests under laboratory condition. Also results obtained from mechanical properties through laboratory test were used to perform numerical modeling, and shear strength obtained from the modeling was used to compare with laboratory direct shear test. As a result numerical analysis from distinct element method can simulate well on the shear behavior of rockmass.
Development of Joint Survey System using Photogrammetric Technique
Son, Youngjin ; Kim, Jaedong ; Jeong, Wansoon ; Kim, Jong-Hoon ; Kim, Ki-Seog ;
Tunnel and Underground Space, volume 24, issue 1, 2014, Pages 55~66
DOI : 10.7474/TUS.2014.24.1.055
In this study, a joint survey system was developed to efficiently analyze geometrical characteristics of joint structures in rock mass using photogrammetric technique. The system includes both hardware and software. The hardware consists of a high resolution image camera for photographing image of a surface of rock body, a direction controlling system for adjusting the attitude of camera, and a digital compass for measuring the rotation angle of camera. The software was also developed in order to analyze the orientation, density, mean length of joints revealed on the images of rock surfaces. The software developed in this study was named as JointeXtractor. As applying this system into several field measurements, the orientation, density, mean length of joints could be quantitatively measured through analyzing the images of rock surfaces, in which the case of a difficult-to-access area was especially included for the test of the system.
Estimation of the Characteristics of Delayed Failure and Long-term Strength of Granite by Brazilian Disc Test
Jung, Yong-Bok ; Cheon, Dae-Sung ; Park, Eui-Seob ; Park, Chan ; Lee, Yun-Su ; Park, Chul-Whan ; Choi, Byung-Hee ;
Tunnel and Underground Space, volume 24, issue 1, 2014, Pages 67~80
DOI : 10.7474/TUS.2014.24.1.067
Long-term stability and delayed failure of granite were evaluated through the laboratory test based on Wilkins method and Brazilian disc test (BDT) which yields tensile strength, mode I fracture toughness and subcritical crack growth parameters. Then, the long-term strength of granite was estimated by using analytical models and long-term stability of compressed air-energy storage (CAES) pilot cavern pressurized up to 5 ~ 6 MPa was evaluated using numerical code, FRACOD with the determined subcritical crack growth parameters. The results of test and analyses showed that the subcritical crack growth index, n was determined as 29.39 and the inner pressure of 5 ~ 6 MPa had an insignificant effect on the long-term stability of pilot cavern. It was also found that the measurement and analysis of acoustic emission events can describe the accumulation of damage due to subcritical crack growth quantitatively. That is, AE monitoring can provide the current status of rock under loading if we make an identical installation condition in the field with that of the laboratory test.
Derivation of Mohr Envelope of Hoek-Brown Failure Criterion Using Non-Dimensional Stress Transformation
Lee, Youn-Kyou ;
Tunnel and Underground Space, volume 24, issue 1, 2014, Pages 81~88
DOI : 10.7474/TUS.2014.24.1.081
In the course of performing the stability analysis of rock structures, there are times when the strength of the Hoek-Brown rock mass needs to be understood in terms of the internal friction angle and cohesion. In this case, the original Hoek-Brown criteion, giving the relationship between
at failure, have to be transformed to the corresponding Mohr envelope. A new approach to derive the Mohr envelope of the Hoek-Brown criterion is suggested in this study. The new method is based on the Londe's transformation making the stress components dimensionless. The correctness of the derivation leading to the new
relationship is confirmed by comparing the calculation results with the Bray's solution through a verification example.
Influence of Joint Secondary Roughness on Roughness Parameter in Direct Shear Test
Lee, Deok-Hwan ; Choi, Sung-Oong ;
Tunnel and Underground Space, volume 24, issue 1, 2014, Pages 89~96
DOI : 10.7474/TUS.2014.24.1.089
Rock joint surface roughness, which is known to be one of the most important factors for defining shear strength of rock mass, has been researched in various methods. However, approaches to separate a roughness into two groups (primary and secondary) for evaluating the roughness have been rarely performed. In this study, elements of secondary roughness were eliminated through direct shear testing with tensile joint specimen and they were quantified with joint parameters. It is revealed that roughness parameters decrease with increasing the normal stress and sampling intervals, except for the case in which the normal stress is larger than 1.5 MPa. Also it is analyzed that ratio of area reduction in the opposite direction of shearing decreases with increasing the roughness parameter.
Influence of Delay Time and Priming Location on the Blast-Induced Ground Vibration
Kang, Choo Won ; Ryu, Bok Hyun ; Choi, Tae Hong ;
Tunnel and Underground Space, volume 24, issue 1, 2014, Pages 97~109
DOI : 10.7474/TUS.2014.24.1.097
In order to identify the characteristics of the propagation depending on delay time (20, 25 ms) and priming location (top priming, middle priming, bottom priming), test blasts were carried out a total of 4 times using different spacing, burden, drilling length, charge per delay and was derived the formula to predict blast vibration. This study investigated the characteristics of vibration by analysis of the nomogram and prediction of Peak Particle Velocity (PPV) from delay time and priming location by the formula to predict ground vibration. And it analyzed the trends of vibration increase by standards charge 0.5, 1.6, 5, 15 kg. Standards charge is "Blasting design and construction guidelines to road construction" by the Ministry of Land, Infrastructure and Transport. Depending on the charge in favor of vibration control method is proposed. Thus, when the design was to be used as a variable.