Rockfall in Ohio An Update of the Rockfall Database Population. Eric Kistner Stantec August 1, 2012 Geohazards Conference
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1 Rockfall in Ohio An Update of the Rockfall Database Population Eric Kistner Stantec August 1, 2012 Geohazards Conference
2 Presentation Outline Rockfall in Ohio An Update of the Rockfall Database Population I. Introduction II. Site Identification III. Site Tiers IV. Field Data Collection V. Database Population VI. Results VII. Remediation Cost Estimating
3 I. Introduction ODOT Geohazards Management System (GHMS) Landslides Underground Voids Rockfall Manual for Rockfall Inventory (ODOT OGE, January 2009) From the manual: rockfalls constitute a major hazard along Ohio roadways, posting a risk to life, property and public safety. Risk assessment process to prioritize rockfall prone sites
4 I. Introduction Why was Rockfall process developed? Rockfall prevalent in Ohio, especially unglaciated areas Problems with past rockfall Highway closures Property damage High repair costs A need to be proactive Public Safety Budgetary Mechanism Informational Resource
5 II. Site Identification Site Criteria Natural or manmade slope with exposed bedrock, i.e. rock slope At least 10 feet tall (normally) Not longer than 1 mile Not crossing county lines
6 III. Site Tiers Determined by: Potential of rockfall occurrence Potential of rockfall reaching travelled lanes Tiers: Tier 1 low to moderate, low to moderate Tier 2 moderate to high, moderate Tiers 3/4 high to very high, high to very high
7 III. Site Tiers Preliminary Rating Potential of Rockfall Occurance Potential of Rockfall Impacting the Traffic Lane Very High (10) High (8) Moderate (4) Low (1) Very High (10) High (8) 12 Moderate (4) Low (1)
8 III. Site Tiers Tiered Approach to Data Collection Preliminary Rating Score (PRS) Required Data Sections Risk Assessment Criteria PRS = 2 to 5 (Tier 1 Sites) Preliminary Rating Only Preliminary Rating Only PRS = 8 to 11 (Tier 2 Sites) Part A Only Site Location, General, and Interview Information; GPS Files PRS = 12 to 16 (Tier 3 Sites) PRS = 18 to 20 (Tier 4 Sites) Part A, Part B, Part C Traffic, Maintenance, Accident, Geological, Slope, Hydrological, Rock Sampling Information
9 IV. Data Collection Field Equipment
10 IV. Data Collection (Performed by PSI Columbus, Ohio) Criteria Required for All Sites Beginning/Ending Mileage Point Orientation/Position of Rock Slope Lat/Long/Elevation
11 IV. Data Collection Tier 1 Sites Slope Configuration Single-Angle Multi-Angle Single-Angle Benched Multi-Angle Benched Slope Condition vegetation cover, talus buildup, weathering, etc. Photographic Documentation
12 IV. Data Collection Tier 2 Sites Geometrics and Traffic Survey Data Additional Slope Information Slope height Overall face angle Undercutting features Jointing patterns Catchment dimensions Corrective actions and effectiveness
13 IV. Data Collection Tier 3/4 Sites Add l Slope Geological Conditions such as: Bench elevations and widths Slope angles and elevations Potential rockfall volume estimations Talus accumulation information Hydrological conditions (springs, seeps,etc.) Slake Durability Index (SDI) testing Road slope and detour distance/time
14 V. Database Population Site Listing
15 V. Database Population Preliminary Rating
16 V. Database Population Site Location
17 V. Database Population Basic Slope Information
18 V. Database Population Geologic Information
19 V. Database Population Joint Information
20 V. Database Population Slope Information
21 VI. Results Statewide Map RED Rockfall Sites > 400 ORANGE Rockfall Sites > 200 YELLOW Rockfall Sites > 100 GREEN Rockfall Sites > 50 LIGHT GREEN Rockfall Sites > 0
22 VI. Results Statewide Summary # of Rockfall Sites 5, % Tier 1 3,997 72% Tier 2 1,040 19% Tier % Tier %
23 V. Database Population Risk Analysis Score
24 Score Summary Tier 2 Sites 419 Tier 3 Sites Tier 4 Sites
25 VII. Remediation Cost Estimating RCDA Remediation Cost Database and Application Web-enabled cost estimating application developed by OSU Plan scenarios Flatten the rock slope Widen the catchment area Placement of a New Jersey or modified D50 concrete barrier Trim blasting of a rock overhang Manually scaling the slope
26 VII. Remediation Cost Estimating Statewide Average Remediation Costs Remediation Scenario Cost ($) / Foot Site Length New Jersey Barrier 87 Modified D50 Concrete Barrier 101 Scaling 164 Trim Blasting 240 Flatten Slope 1,885 Flatten Slope with Added Catchment 2,392
27 VII. Remediation Cost Estimating Scaling COS-36
28 VII. Remediation Cost Estimating Trim Blasting After Before GUE-22 North Slope
29 VII. Remediation Cost Estimating Trim Blasting/Draping After Before GUE-22 South Slope
30 Closing Ohio (esp. southeast Ohio) contains rockfall-prone bedrock formations. ODOT has established a risk-based inventory for rockfall-prone sites. ODOT is utilizing the inventory to systematically remediate the highest risk sites. Questions?
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