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Assessment of Sinkhole Occurrences Using Fuzzy Reasoning Techniques
D. Deb,S.O. Choi(최성용) 한국암반공학회 2004 한국암반공학회 학술대회 및 세미나 자료집 Vol.- No.-
Underground mining causes surface subsidence long after the mining operation had been ceased. Surface subsidence can be in the form of saucer-shaped depression or collapsed chimneys or sinkholes. Sinkhole formations are predominant over shallow-depth room and pillar mines having weak overburden strata. In this study, occurrences of sinkholes due to mining activity are assessed based on local geological conditions and mining parameters using fuzzy reasoning techniques. All input and output parameters are represented with linguistic hedges. Numerous fuzzy rules are developed to relate sinkhole occurrences with input parameters using fuzzy relational matrix. Based on the combined fuzzy rules, possibility of sinkhole occurrences can be ascertained once the geological and mining parameters of any area are known.
Pit Optimization for Steep Coal Seams at Pasir Coal Mine, Indonesia
D. Deb,선우춘,정용복 한국자원공학회 2009 한국자원공학회지 Vol.46 No.5
Coal seams of study Coal Mine are found to be of irregular shape, steeply dipping and having variable thickness. Due to steep coal seams with varying thickness, pit optimization became imperative to improve stripping ratio and net profitability of the mine. In this study, Lerchs-Grossmann algorithm is applied to obtain the optimum pit geometry, net pit value, coal production, stripping ratio and profitability index for mining coal seams. The MAXPIT software has been developed specifically to determine the optimum pit geometries at various sections of the mine for the estimation of net pit value, coal production, stripping ratio and profitability index. The study is also extended for the determination of vertical depth of the pit that can be mined with maximum profitability and minimum stripping ratio. This paper elaborates the methodologies, application of MAXPIT software and results of the optimum pit geometries at 50 different sections of the Roto South coal deposit.
Rock failure analysis using smoothed-particle hydrodynamics
R. Pramanik,D. Deb 한국자원공학회 2013 Geosystem engineering Vol.16 No.1
This paper presents a numerical simulation for predicting fracture and failure growth of geomaterial using smoothed-particle hydrodynamics (SPH). The first example deals with slope stability analysis of a chromite mine having friable chromite as the ore body. The ultimate pit may reach up to 144m below the surface with an ultimate pit angle of 308 for 19 benches. It is require to forecast the stability of the ultimate pit slope for a given material and pit geometry. This paper analyses the stability of this slope by considering Drucker–Prager rock mass medium using the SPH procedure. The second example comprises the fracture growth of a circular rock specimen under diametrically opposite concentrated angular loads. In order to determine the plastic regime of the specimen for a given tensile strength, the Rankine maximum tensile failure criterion is implemented in the SPH framework.
Characterization of Rock Materials based on Signal Emission levels Under Uni-Axial Compression
K.U.M. Rao,Subir Kumar Ghosh,Sudipta Bhattacharjee,D. Deb,Samir K.Pal 한국암반공학회 2010 한국암반공학회 학술대회 및 세미나 자료집 Vol.2010 No.10
Characterization of engineering materials is an essential aspect of manufacturing, since the properties of both the job and the tool influence each other. Experimental work is conducted to detect acoustic, vibration and electromagnetic emissions produced during uniaxial compressive loading of rock specimens. Preliminary results of testing limestone, quartz and sandstone rock specimens are presented. Some results of testing granite and coal samples are also presented. Results indicate that different types of AE, vibration and EM signals are produced during testing of a rock type to failure. In rock drilling one of the main consumables is the cutting tool. The performance of the cutting tool and its life is also controlled by the properties of the job (rock). The present work aims at characterization of rock material based on the physical and mechanical properties, as well as the levels of acoustic emissions and electromagnetic emission under uni-axial compression with the help of appropriate sensors and instrumentation.