Go to the main menu
Skip to content
Go to bottom
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 9, Issue 4 - Dec 1999
Volume 9, Issue 3 - Sep 1999
Volume 9, Issue 2 - Jun 1999
Volume 9, Issue 1 - Mar 1999
Selecting the target year
방사성 폐기물 심지층 처분시설 건설을 위한 암석역학의 응용
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 243~259
암반공학분야에서의 연구개발 활동과 전망
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 260~272
General Report Concerning Some 20th Century Lessons and 21st Century Challenges in Applied Rock Mechanics, Safety and Control of the Environment
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 273~281
Applied Rock Mechanics - Safety and Control of the Environmental
J. Nielen van der Merwe ;
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 281~282
Coupling mechanical phenomena with thermal, hydraulic and chemical phenomena
E. Detournay ; M. Van Sint Ian ;
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 282~283
Rock Dynamics and Tectonophysics
I. McGarr ; J. Dubinski ;
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 283~284
In-Sit Tests and Measurements, Monitoring
O. Stephansson ; W. Steiner ;
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 284~287
Analysis of Tunnel Behavior Using Progressive Rockmass Failure Technique
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 288~295
Concentrated stresses due to the underground tunnel excavation easily cause many problems such as yielding, popping, and failure at the immediate roof, wall and floor of tunnel. Therefore, it is very important to predict the possibility of these problems when a tunnel is excavated underground. There are two typical methods to predict these problems. The one is to predict problems from the analysis of field monitoring data and the other is to predict them from computer simulations using good site investment data. Using the second method, this study attempted to describe the time-dependent or progressive manner of immediate roof and wall due to the underground tunnel excavation. An iterative technique was used to represent progressive failure of rockmass with the Hoek and Brown theory. By developing and simulating three different shapes of twin tunnels, this research estimated the proper size of critical pillar width between tunnels, distributed stresses on the tunnel walls, and convergences of tunnel crowns. Moreover, results out of progressive failure technique based on the Hoek and Brown theory were compared with the results out of Mohr-Coulomb theory.
A Back Analysis Study for the Assessment of Tunnel Lining Safety Using Numerical Analysis Model
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 296~305
In ordinary back analysis it if hardly possible to obtain the mechanical properties of tunnel lining by using commonly measured displacements of tunnel lining, because only a few displacements could be measured at the site. Therefore, it is necessary to develop a new method which can evaluate the state of stresses of tunnel by using measured data. In this study, in order to assess tunnel lining stability by estimating its stresses with a few measured displacements, a formulation of back analysis method was proposed. The accuracy of results were investigated through the parametric study for several types of measurement model of two dimensional elastic lining. This new back analysis method to assess tunnel lining stresses and strains with a few numbers of measured displacements showed high accuracy and good applicability when compared to the results of numerical experiments by FEM. The method has been tested on subway tunnel and its applicability has been confirmed by comparing field and analytical data. It is verified that the stress on the tunnel lining can be obtained by only more than 3 point of input displacements without any condition of external loads.
A study on simulation modeling of the underground space environment-focused on storage space for radioactive wastes
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 306~314
In underground spaces including nuclear waste repository, prediction of air quantity, temperature/humidity and pollutant concentration is utmost important for space construction and management during the normal state as well as for determining the measures in emergency cases such as underground fires. This study aims at developing a model for underground space environment which has capabilities to take into account the effects of autocompression for the natural ventilation head calculation, to find the optimal location and size of fans and regulators, to predict the temperature and humidity by calculating the convective heat transfer coefficient and the sensible and latent heat transfer rates, and to estimate the pollutant levels throughout the network. The temperature/humidity prediction model was applied to a military storage underground space and the relative differences of dry and wet temperatures were 1.5 ~ 2.9% and 0.6 ~ 6.1%, respectively. The convection-based pollutant transport model was applied to two different vehicle tunnels. Coefficients of turbulent diffusion due to the atmospheric turbulence were found to be 9.78 and 17.35
/s, but measurements of smoke and CO concentrations in a tunnel with high traffic density and under operation of ventilation equipment showed relative differences of 5.88 and 6.62% compared with estimates from the convection-based model. These findings indicate convection is the governing mechanism for pollutant diffusion in most of the tunnel-type spaces.
Measurement of rock fracture toughness under mode I, II & mixed-mode conditions by using disc-typed specimens
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 315~327
Rock fracture mechanics has been widely applied to blasting, hydraulic fracturing, rock slope and many other practical problems in rock engineering. But a measuring method for the fracture toughness of rock, one of the mort important parameters in fracture mechanics as an intrinsic property of rock, has not been yet well established. To obtain mode I rock fracture toughness, the more favorable disc-typed specimens such as CCNBD, SCB, chevron-notched SCB and BDT were used in this study. Rock fracture toughness under mixed-mode and mode II conditions was measured by using the STCA applied to the CCNBD specimen. Size effects such as specimen thickness, diameter and notch length on fracture toughness were investigated. From the mixed-mode results, fracture envelops were obtained by applying various regression curves. The mixed-mode results were also compared with three mixed-mode failure criteria. In each fracture toughness test, acoustic emission was measured to get the data for determining the load levels of different crack propagation patterns.
A Study on Hydro-mechanical Behaviors of Rock Joints using Rotary Shear Testing Apparatus
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 328~336
To characterize the hydro-mechanical behavior of a rock joint, a rotary shear testing apparatus was devised in this study. Shear stress was driven by twisting the end of a sample in the rotary shear testing apparatus. The test results show that the rotary shear test underestimates the peak shear strength of a rock joint. The torque is known as a function of the radial distance from the axis of rotation, resulting in the radial variation of the shear stress. Fluid flow through rock joints is mainly dependent on the Joint roughness, contact area, initial aperture. To examine the dependency, the relationship between the hydraulic and the mechanical apertures for shear-flow was established by measuring the initial aperture. It shows that the mechanical aperture and the hydraulic aperture increase linearly with the dilatancy. The difference between the hydraulic and mechanical apertures describes the deviation from the behavior predicted by the parallel plate model.
A Study on Fuzzy Logic Method for the Assessment of Tunnel Concrete Lining
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 337~349
There are many difficulties to the engineers in the assessment of tunnel safety. Consequently, objective assessment of concrete lining is hard even by the experts of tunnel assessment. Of several difficulties in the assessment of tunnel safety, in this study, tunnel concrete lining was focussed iud evaluated quantitatively and objectively using the Fuzzy theory which it generally considered to be appropriate for the assessment, control and judgment. T-FLAS based on fuzzy theory was developed in this study for the quantitative and objective assessment of the concrete lining in tunnels. Based on the application of T-FLAS on the evaluated field data, it was shown that the assessment system using fuzzy theory(T-FLAS) can be the effective and objective method for the assessment of concrete lining.
A Experimental Study for the Mechanical Behavior of Rock Joints under Cyclic Shear Loading
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 350~363
The precision cyclic shear test system was established to investigate the mechanical characteristics of rough rock joints under cyclic loading conditions. Laboratory cyclic shear tests were conducted for saw-cut joints and artificial rough rock joints using Hwangdeung granite and Yeosan marble. Surface roughness and aperture characteristics of specimens were examined by measuring surface topography using the laser profilometer. Peak shear strength, phase difference during loading and unloading, and anisotropic shear behavior were investigated throughout the cyclic shear test results. These features and their subsequent variations in each loading cycle are significantly dependent upon the second order asperities and the strength of intact rock. It was observed that degradation of asperities for rough rock joints under cyclic shear loading followed the exponential degradation laws of asperity angle and that the mechanism for asperity degradation would be different depending upon the normal stress level, roughness of joint surface and the loading stage.
Estimation of Micro-discontinuity Distribution Using Scanline Survey in Granites
Tunnel and Underground Space, volume 9, issue 4, 1999, Pages 364~372
In this paper, mechanical characteristics of micro-defects in granitic rock was studied. Crack spacing and length were investigated by scanline survey in specimen of granite. To estimate the direction and distribution of potential microcrack in granite, thin sections were made for three direction of Rift, Grain and Hardway axis of the rock specimen. The density and length of microcrack were investigated quantitatively. Three directions of microcracks are comparatively perpendicular. Crack density varies as direction differs, but crack length doesn't show influence of direction.