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| 1 | Ground response to high horizontal stresses during longwall retreat and its implications for longwall headgate support显示文摘Roof falls in longwall headgate can occur when weak roof and high horizontal stress are present. To prevent roof falls in the headgate under high horizontal stress, it is important to understand the ground response to high horizontal stress in the longwall headgate and the requirements for supplemental roof support. In this study, a longwall headgate under high horizontal stress was instrumented to monitor stress change in the pillars, deformations in the roof, and load in the cable bolts. The conditions in the headgate were monitored for about six months as the longwall face passed by the instrumented site.The roof behavior in the headgate near the face was carefully observed during longwall retreat.Numerical modeling was performed to correlate the modeling results with underground observation and instrumentation data and to quantify the effect of high horizontal stress on roof stability in the longwall headgate. This paper discusses roof support requirements in the longwall headgate under high horizontal stress in regard to the pattern of supplemental cable bolts and the critical locations where additional supplemental support is necessary. | Peter Zhang Dave Gearhart Mark Van Dyke Daniel Su Essie Esterhuizen Berk Tulu | 2019 | International Journal of Mining Science and Technology2019，29，1： | 6 |
| 2 | A case study of multi-seam coal mine entry stability analysis with strength reduction method显示文摘In this paper,the advantage of using numerical models with the strength reduction method(SRM) to evaluate entry stability in complex multiple-seam conditions is demonstrated.A coal mine under variable topography from the Central Appalachian region is used as a case study.At this mine,unexpected roof conditions were encountered during development below previously mined panels.Stress mapping and observation of ground conditions were used to quantify the success of entry support systems in three room-and-pillar panels.Numerical model analyses were initially conducted to estimate the stresses induced by the multiple-seam mining at the locations of the affected entries.The SRM was used to quantify the stability factor of the supported roof of the entries at selected locations.The SRM-calculated stability factors were compared with observations made during the site visits,and the results demonstrate that the SRM adequately identifies the unexpected roof conditions in this complex case.It is concluded that the SRM can be used to effectively evaluate the likely success of roof supports and the stability condition of entries in coal mines. | Tulu Ihsan Berk Esterhuizen Gabriel S. Klemetti Ted Murphy Michael M. Sumner James Sloan Michael | 2016 | International Journal of Mining Science and Technology2016，26，2： | 5 |
| 3 | Analysis of roof and pillar failure associated with weak floor at a limestone mine显示文摘A limestone mine in Ohio has had instability problems that have led to massive roof falls extending to the surface. This study focuses on the role that weak, moisture-sensitive floor has in the instability issues.Previous NIOSH research related to this subject did not include analysis for weak floor or weak bands and recommended that when such issues arise they should be investigated further using a more advanced analysis. Therefore, to further investigate the observed instability occurring on a large scale at the Ohio mine, FLAC3 D numerical models were employed to demonstrate the effect that a weak floor has on roof and pillar stability. This case study will provide important information to limestone mine operators regarding the impact of weak floor causing the potential for roof collapse, pillar failure, and subsequent subsidence of the ground surface. | Murphy Michael M. Ellenberger John L. Esterhuizen Gabriel S. Miller Tim | 2016 | International Journal of Mining Science and Technology2016，26，3： | 5 |
| 4 | Numerical simulation of roof cavings in several Kuzbass mines using finite-difference continuum damage mechanics approach显示文摘An essential stage of mine design is an estimation of the steps of the first and periodic roof caving in longwall mines.Generally,this is carried out using the field experience and can be much enhanced by numerical simulation.In this work,the finite-difference method was applied coupled with the continuum damage mechanics(CDM)approach to simulate the stress-strain evolution of the rock mass with the underground opening during coal extraction.The steps and stages of roof caving were estimated relying on the numerical simulation data,and they were compared with the field data from several operating mines in the south of the Kuznetsk Basin,Russia.The dependence of the first roof caving step in simulation linearly correlates with field data.The results correspond to the actual roofs of longwall panels of the flat-dipping coal seams and the average rate of face advancement is approximately 5 m/day. | Mikhail Eremin Gabriel Esterhuizen Igor Smolin | 2020 | International Journal of Mining Science and Technology2020，30，2： | 3 |
| 5 | Constitutive behavior of geosynthetic interface显示文摘 | ESTERHUIZEN J J B FLIZ G M DUNCAN J M | 2001 | Journal of Geotechnical & Geoenvironmental Engineering2001，127，10： | 1 |
| 6 | Sperm chromatin packaging as an indicator of in-vitro fertilization rates显示文摘 | Esterhuizen AD Franken DR Lourens JGH | 2000 | Hum Reprod2000，15，3： | 1 |
| 7 | A knowledge management framework to grow innovation capability maturity显示文摘 | Esterhuizen D Schutte C Du Toit A | 2012 | SA Journal of Information Management2012，14，1： | 1 |
| 8 | Constitutive behavior of geosynthetic interface显示文摘 | ESTERHUIZEN J J B FILZ G M DUNCAN J M | 2001 | Journal of Geotechnical and Geoenvironmental Engineering2001，127，10： | 1 |
| 9 | Evaluation of stress-control layout at the Subtropolis Mine,Petersburg,Ohio显示文摘The Subtropolis room-and-pillar mine extracts the Vanport Limestone(Allegheny Formation,Pennsylvanian System)near Petersburg,Ohio.Strata instability problems associated with excessive concentrations of lateral stress caused the mine operator to implement a change in layout design.This mining method has been identified as a stress control layout and has been used by other underground stone mines in the past with varying degrees of success.Practical experience has shown that entry headings advance in the direction of the principal lateral stress,producing lower stress concentrations with better mining conditions.It is important to minimize stress concentrations along the mining front,so an arrowshaped advance is recommended.This technique advances more developments(headings)in a'good'direction and reduces developments(crosscuts)in the'bad direction.'As is expected,the stress control layout enhances the potential for shear failures in crosscuts.It is,therefore,important to focus crosscut engineering interventions that either:(a)lower stress concentrations(for example,an arched roof)or(b)enhance strength of the strata containing the shears(for example,rock reinforcement).This study focuses on observing strata conditions on a regular basis and monitoring the response of these strata to changing geologic and mining conditions through 3D Dynamic LiDAR scans. | Anthony Iannacchione Tim Miller Gabriel Esterhuizen Brent Slaker Michael Murphy Natalie Cope Scott Thayer | 2020 | International Journal of Mining Science and Technology2020，30，1： | 1 |
| 10 | Procedure for prolapsed haemorrhoids versus excisional haemorrhoidectomy a systematic review and meta-analysis显示文摘 | Madiba TE Esterhuizen TM Thomson SR | 2009 | S Afr Med J2009，99，1： | 1 |
| 11 | Knowledge creation processes as critical enablers for innovation 显示文摘 | ESTERHUIZEN D CSL Schutte ASA Du Toit | 2012 | International Journal of Information Management2012，32，4： | 1 |
| 12 | Rooyen LH : Sperm chromatin packaging as an indicator of in vitro fertilization rates显示文摘 | Esterhuizen AD Franken DR Lourens JGH | 2000 | Hum Reprod2000，15，3： | 1 |
| 13 | Knowledge creation process as critical enablers for innovation 显示文摘 | ESTERHUIZEN D SCHUTI'E C S L DU TOIT A S A | 2012 | International Journal of Information Management2012，32，4： | 1 |
| 14 | The time- course changes of NT-proBNP and tissue Doppler indices in patients undergoing mitral valve replacement显示文摘 | Prakaschandra D R Esterhuizen T Naidoo D P | 2012 | Cardiovasc J Afr2012，23，4： | 1 |
| 15 | Pillar strength in underground stone mines in the United States显示文摘 | G.S. Esterhuizen D.R. Dolinar J.L. Ellenberger | 2010 | International Journal of Rock Mechanics and Mining Sciences2010，，1： | 1 |
| 16 | Genetic nmpping of gray leaf spot(GLS) resistance genes in malze显示文摘 | Lehmensuek A Esterhuizen A M | 2001 | Theer Appl Genet2001，103，： | 1 |
| 17 | Constitutive Behavior of Geosynthetic Interfaces显示文摘 | Jacob J. B. Esterhuizen George M. Filz J. Michael Duncan | 2001 | Journal of Geotechnical and Geoenvironmental Engineering2001，，10： | 1 |
| 18 | Reservoir simula- tion based modeling for characterizing longwall methane emissions and gob gas venthole production 显示文摘 | Karacan C O Esterhuizen G S Schatzel S | 2007 | International Journal of Coal Geology2007，71，： | 1 |
| 19 | Clinical importance of zona pellucida-induced acrosome reaction and its predictive value for IVF显示文摘 | ESTERHUIZEN A D FRANKEN D R LOURENS J D H | 2001 | Hum Reprod2001，16，1： | 1 |
| 20 | Reservoir simulation-based modeling for characterizing longwall methane emissions and gob gas venthole production显示文摘 | Karacan C Esterhuizen Schatzel S | | 0，，71： | 1 |
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