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SME-ICGCM (1801)
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TITLE Strata Control Investigations During Fully Mechanized Coal Pillar Extraction in Indian Coalfield
SUMMARY Considering the importance of a fully mechanized depillaring operation, the Indian coal mining industry has introduced a number of such depillaring operations at depths of cover ranging from 60 m to 377 m. The overlying strata of these depillaring faces vary widely from highly laminated, weak and easily caveable to massive, strong and difficult to cave. Most of these mechanized depillaring operations were carried out in difficult site conditions, however, performance monitoring in the field has ...
AUTHOR Singh, Rajendra
TITLE Shear Strength Characteristics of Soft Rock Joints Based on Constant Normal Stiffness Testing
SUMMARY Large-scale shear apparatus is designed to investigate the shear hehaviour of simulated soft rock joints under constant normal stifmess condition. Regular saw-teeth profiles having inclinations between 9.5"and 26.5"have been tested. The strength envelope based on these test results indicates that predictions made by Panon (1966) are accurate for the lower asperity angles. However, for higher asperity angles, Patton's model overestimates the shear strength especially in the low to medium normal s...
AUTHOR Indraratna, B.
TITLE Risk Analysis and Risk Ranking in Tunneling: A Case Study
SUMMARY Constructing tunnels underground is generally described as a high-risk activity because conditions in the surrounding area tend to be unpredictable. This would and can create unique dangers in every situation. It is important to gain a deep understanding of the risks associated with tunneling in order to reduce the likelihood of their occurrence and severity of their consequences should they occur. For this to be achieved, different risks should first be evaluated and ranked according to their ...
AUTHOR Oraee, Behdeen
TITLE A Case Study of Topography?Related Stress Rotation Effects on Multi?seam Stability
SUMMARY The complex interaction between multiple seam pillar extraction panels and variable topography can generate unexpected ground control problems. This case study describes stress-related damage in multiple seam workings that resulted in difficult operating conditions and compromised the safety of the support crews. The damage appeared to be caused by horizontal stress but the unexpected location of the damage baffled the authors. A 2D Finite element analysis was conducted of the mine layout and su...
AUTHOR Tulu, Ihsan Berk
TITLE Combined Effects of Rock Bedding Orientation and Topography on Stresses Around Mine Openings
SUMMARY In this paper we introduce a realistic model for mine openings that explicitly considers the effects of local irregular topography. Also, we consider the effect of entry orientation and rock anisotropy on the induced stress fields around mine openings under the given in-situ stress field. A triangular mesh formulation is derived for representing complicated irregular surface topography and underground openings. Each element contains three internal collocation nodes. Parts of the surface which ar...
AUTHOR Tabrizi, Amirhossein Molavi
TITLE Development of Road Header Roof Bolting Module
SUMMARY In underground mining and tunneling, machine design is predominantly dictated by mine conditions and individual customer desires. In partnership with Australian companies WDS Limited and Cram Fluid Power, the engineering department of J.H. Fletcher & Company was tasked to design and manufacture roof bolting modules to be mounted off both sides of a roadheader, providing in-cycle bolting. The objective was to produce a boom and bolt module that would allow an operator to bolt from a remote loca...
AUTHOR Farrell, Sean C.
TITLE Introduction of a New Superior Coating on Ground Support Products
SUMMARY Corrosion can often cause significant strength reduction and failure of steel rockbolts, thus demanding continuous rehabilitation and posing challenges to underground mines in maintaining long term ground support. The mining industry has traditionally applied galvanized and epoxy coatings for protection of ground support and reinforcement in corrosive environments due to cost considerations. However, under a harsh and corrosive groundwater condition with extreme pH levels, failure of the exist...
AUTHOR Oler, Renn
TITLE Sandy Creek Waterfall?Case Study of Successful Management of the Potential Impacts of Longwall Mining on a Sensitive Natural Surface Feature
SUMMARY BHP Billiton Illawarra Coal operates Dendrobium Mine in an area 10-20km west-northwest of Wollongong in the Southern Coalfield of New South Wales, Australia. The mine recently completed longwall mining in Area 3A adjacent to an overhanging rock feature known as Sandy Creek Waterfall, which had been identified as a significant, and potentially sensitive natural surface feature of the environment. This waterfall lies within the Sydney drinking water catchment area, in a surface terrain of variab...
AUTHOR Hebblewhite, Bruce K.
TITLE Validation of Overburden Failure Zone in Complex Extra Thick Coal Seam by EH?4 Magnetotelluric Method
SUMMARY EH-4 Electrical conductivity imaging system has been playing an important role in prospecting, looking for water resource, and determining coal mine gob boundary by virtue of its significant advantages such as collection of large volume of data, light weight, fast analysis, high-precision, and low cost. However, it has little application in determining the overburden failure zone and development of water flowing fractured zone and bed separation space in complex extra thick coal seam conditions....
AUTHOR Rong, Hai
TITLE Introduction of a Measurement Based Ground Control Management System to a Deep Level Potash Mine
SUMMARY A measurement-based ground control management system, commonly employed in coal mines, has been successfully implemented in a UK potash mine operating at a depth of over 800 m. This system includes the routine deployment of telltales in roadways throughout the mine to mitigate against the risk of large-scale roof falls and the deployment of detailed ?design monitoring? instrumentation for ongoing design verification. The routine monitoring systems used in coal mines have not been, to date, commo...
AUTHOR Garcia, Alexandra