Coal Tax Severance Study - The Effects of Heavier Axle Loads on Southwest Virginia Pavements  Trenton Clark, P.E. - Assi

Coal Tax Severance Study - The Effects of Heavier Axle Loads on Southwest Virginia Pavements Trenton Clark, P.E. - Assi PowerPoint PPT Presentation


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Presentation . What is a Coal Severance TaxReason for the StudyStudy Work PlanPreliminary ResultsSteps Forward. What is a Coal Tax Severance?. A Tax levied against the coal industry in SW Virginia to pay for Infrastructure Improvements - roads, schools, water, etc. Tax allowed Coal Trucks to

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Coal Tax Severance Study - The Effects of Heavier Axle Loads on Southwest Virginia Pavements Trenton Clark, P.E. - Assi

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1. Coal Tax Severance Study - The Effects of Heavier Axle Loads on Southwest Virginia Pavements Trenton Clark, P.E. - Assistant State Pavement Engineer

2. Presentation What is a Coal Severance Tax Reason for the Study Study Work Plan Preliminary Results Steps Forward

3. What is a Coal Tax Severance? A Tax levied against the coal industry in SW Virginia to pay for Infrastructure Improvements - roads, schools, water, etc. Tax allowed Coal Trucks to haul at higher axle loads Started in 1980’s and affects the following counties - Buchanan, Wise, Tazewell, Russell, Dickenson, Lee and Scott.

4. Specifics of HB2209 Enacted in 1999 General Assembly Session Amended Code of Virginia - original Coal Severance Tax Allows trucks carrying sand, gravel or crushed stone in Coal Tax counties to haul a coal truck weight limits within 50 miles of point of origin Trucks do not need a permit to haul at higher limits Does not apply to VA interstates

5. Weight Limits Under HB2209

6. Purpose of Study VDOT directed by General Assembly to monitor operation of vehicles and report on condition of roadways effected by the bill. Report to be issued to Governor and General Assembly for 2001 session Based on report findings, General Assembly can allow bill to expire July 1, 2001, extend bill for another period of time, or enact into law

7. Objective of Study To determine if vehicles operating under the provisions of HB2209 cause pavements to deteriorate faster and therefore exacerbate maintenance, repair and rehabilitation requirements than pavements that do not support traffic operating under the bill.

8. Scope of Study 13 Month Study Monitoring Sites - Control and Test Sites Final Report and Recommendations

9. Work Plan Select Sites with Medium to High Traffic Volumes on Primary and Secondary Routes Perform Pavement Condition Surveys Visual Condition Ride Quality Rut Measurements Structural Evaluation with FWD Perform Destructive Testing Perform Traffic Survey Prepare Final Report with Recommendations

10. Site Selection 18 Total Monitoring Sites 10 Test Sites 8 Control Sites Site Length - 0.3 miles Primary or Secondary Route

11. Pavement Condition Surveys Visual Condition Surveys Segmented sites in 0.01 mi. lengths VDOT visual condition approach - LDR and NDR Performed Quarterly Ride Quality and Rut Measurement Measured in each wheel path South Dakota Type Profiler and Straight-edge Calculated IRI and Rut Depth

12. Traffic Survey Performed in Spring 2000 Portable WIM station - 8 to 10 hr Monitoring 24 Hour Traffic Count Visual counting of sand/gravel trucks for 2 hrs Data Results - Vehicle Classifications by Volume Total Weight

13. Structural Evaluation with FWD Dynatest FWD Two load levels - 9,000 and 16,000 lbs. LTPP Sensor Spacing Test Spacing - 50 feet Analysis performed using VDOT developed software Based on 1993 AASHTO Pavement Design Guide Results in terms of Effective SN and Subgrade Mr

14. FWD Analysis Approach Test quarterly to monitor changes in structure and subgrade over time Test in Center Lane and Outside Wheel-path Done to see if initial differences existed Done to compare CL and OWP over the study period

15. FWD Analysis Software

16. Sample Screens from TAG

17. Sample Screen Shots

18. Sample Screen Shots

19. Sample Screen Shots

20. Sample Screen Shots

21. Structural Analysis Results Proved Initial Fear - 13 months to short time period to see changes for most segments Variable Pavement Structures over Short Distance Changes in Subgrade Strength (Temperature and Moisture) Noise in SNeff - most sections in good condition, unable to see changes due to fatigue

22. Visual Survey and Rutting Results Load and Non-Load Distress Indices faster show deterioration, as expected where heavier trucks are present Rutting has increased on all sites, dramatically on some - 2”

23. Final Report Currently under development Original Approach - Show increased deterioration in test vs. control sites due to increased loading. However data does not support, why? Pavements along coal truck routes designed for heavier loading Structure adequate although pavement life reduced Hard to monitor in 13 month period

24. Final Report (cont.) New Approach - Show cost to Virginia Taxpayers to accommodate increased axle weights. Compare control site performance to test site performance Non-coal truck routes not designed for heavier loads To meet loading demands, structure must be increased on HB2209 effected roadways Higher taxes needed to pay for improvements Estimated cost to improve routes in SW Virginia and all of Virginia

25. Comments or Questions?

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