1 / 26

DANIEL W.H. SU CONSOL ENERGY INC. CANONSBURG, PA

A RETROSPECTIVE ASSESSMENT OF GROUND CONTROL RESEARCH AND SUCCESSFUL APPLICATIONS IN THE COAL INDUSTRY. DANIEL W.H. SU CONSOL ENERGY INC. CANONSBURG, PA. OBJECTIVES. GROUND CONTROL RESEARCH ? -GROUND CONTROL ENGINEER? -WORTH ONE’S SALT ? -WORTH THE EFFORT ?

kasimir-buckley
Download Presentation

DANIEL W.H. SU CONSOL ENERGY INC. CANONSBURG, PA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A RETROSPECTIVE ASSESSMENT OF GROUND CONTROL RESEARCH AND SUCCESSFUL APPLICATIONS IN THE COAL INDUSTRY DANIEL W.H. SU CONSOL ENERGY INC. CANONSBURG, PA

  2. OBJECTIVES GROUND CONTROL RESEARCH ? -GROUND CONTROL ENGINEER? -WORTH ONE’S SALT ? -WORTH THE EFFORT ? GROUND CONTROL RESEARCH AT CONSOL ENERGY SUCCESSFUL APPLICATIONS TO CONSOL’S MINING OPERATIONS

  3. GROUND CONTROL RESEARCH AT CONSOL ENERGY • COAL PILLAR DESIGN • SURFACE SUBSIDENCE • HORIZONTAL STRESS IMPACT • FLOOR BEARING CAPACITY • LONGWALL FACE SUPPORT DESIGN • HYDRAULIC FRACTURING OF MASSIVE SANDSTONE • SANDSTONE STABILITY UNDER DEEP COVER • ROOF GEOLOGY RECONNAISSANCE • INNOVATIVE ROOF SUPPORT CONCEPTS

  4. HORIZONTAL STRESS MEASUREMENTS AND IMPACT ANALYSIS STRESS MEASUREMENTS USING 3D BOREHOLE DEFORMATION GAGE STRESS MEASUREMENTS USING MINIFRAC STRESS MEASUREMENTS USING HYDRAULIC FRACTURING IMPACT OF HIGH HORIZONTAL STRESS ON MINING OPERATIONS HS CONCENTRATION – CSIRO HI CELL PILLAR DESIGN MODIFICATION RIGHT-HAND VS. LEFT-HAND LONGWALL

  5. RESULTS OF STRESS MEASUREMENTS POCAHONTAS #3 SEAM -MAX HORIZONTAL STRESS: 2970 PSI(N55E) -MIN HORIZONTAL STRESS : 2090 PSI PITTSBURGH SEAM -MAX HORIZONTAL STRESS : 4300~5000 PSI(E-W) -MIN HORIZONTAL STRESS : 3400 PSI ILLINOIS #6 SEAM -MAX HORIZONTAL STRESS : 2000 PSI(E-W) -MIN HORIZONTAL STRESS : 800 PSI

  6. MEASUREMENTS OF HORIZONTAL STRESS CONCENTRATION AND ROOF DEFORMATION

  7. ROOF GEOLOGY AND HORIZONTAL STRESS MAGNITUDE AND ORIENTATION

  8. SUMMARY DETERMINE STRESS ORIENTATION AND MAGNITUDE FORECAST ROOF CUTTER DEVELOPMENT DEFINE RIGHT-HAND AND LEFT-HAND LONGWALL PANELS PILLAR DESIGN MODIFICATION TO MITIGATE HORIZONTAL STRESS IMPACT USE OF CABLE BOLTS AND INNOVATIVE STANDING SUPPORT TO MITIGATE HORIZONTAL STRESS IMPACT

  9. HYDRAULIC FRACTURING TO PROMOTE CAVING OF THICK, MASSIVE SANDSTONE TO IMPROVE FACE CONDITIONS INDUCED HORIZONTAL FRACTURES FACE MONITORING AND NUMERICAL MODELING CONFIRMED THE EFFECTIVENESS

  10. Estimated Mechanical Properties of Pittsburgh Sandstone

  11. BENDING STRESS,PSI -9030 SANDSTONE SHALE 0 COAL +420 BENDING STRESS DISTRIBUTION AT THE FACE WITHOUT FRACING

  12. BENDING STRESS,PSI -9030 SANDSTONE SHALE 0 +420 COAL BENDING STRESS CONTOURS AT THE FACE WITH ONE FRAC

  13. Comparison of Production Downtime and Average Face Advance for the B12, B13, and B14 Faces within the Sandstone Channel Interval

  14. ROOF GEOLOGY RECONNAISSANCE INITIATED IN THE EARLY 90’S CONDUCT ROOF SCOPING USING FIBERSCOPE, GAMMA LOGGER AND BOREHOLE CAMERA GUIDE MINE PLANNING DECISION GUIDE DAILY ROOF SUPPORT PRACTICES IMPROVE ROOF STABILITY MINIMIZE LONGWALL MOVE DELAYS REDUCE ROOF FALL FREQUENCY UP TO 80%

  15. CONCLUSIONS SAFETY COMPLIANCE CONTINUOUS IMPROVEMENT PRODUCTIVITY COST WORTH ONE’S SALT WELL WORTH THE EFFORT

  16. THANK YOU QUESTIONS ?

More Related