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From page 60... ... 60 Survey Responses A P P E N D I X B Part C: Rock Slope and Rockfall "Demographics" Q1: How many road miles is your agency responsible for? (Self-Reported) Read the entire page →
From page 61... ... Survey Responses 61 The number is an estimate based on experience. 41.94 13 Total 31 Percentages cited: 75, 1, 1, 0, 50, 100, 85, 0, 100, 95, 3, 90, 20, 0, 100, 100, 20, 100, 25, 50, 90, 100, 20, 90. Read the entire page →
From page 62... ... 62 Design Practices for Rock Slopes and Rockfall Management Design services provided by consultants 51 1,570 31 Design services provided by a construction contractor 9 217 23 Design services provided by a manufacturer 0 1 23 Q6: Considering the design of rockfall mitigation measures in the past 20 years, please estimate a percentage that best describes the designer's affiliation. Please fill in the approximate percentage (0 to 100 scale, adding up to 100) Read the entire page →
From page 63... ... Survey Responses 63 Standard drawing RD11-S-11B is [roadway] designer guidance, but there are notes on the sheet that advise seeking geotechnical advisement on most matters. Read the entire page →
From page 64... ... 64 Design Practices for Rock Slopes and Rockfall Management We have the same standards (catchment width, etc.) but acknowledge that there are differences in how you address issues depending on if it is a new cut or mitigation. Read the entire page →
From page 65... ... Survey Responses 65 Q4: Does your agency apply these standards to other appurtenant facilities, such as pedestrian trails, maintenance facilities, bridge abutments, and so forth? ANSWER CHOICES PERCENTAGE RESPONSES Yes 30.30 10 No 36.36 12 Not applicable 33.33 11 Comments: NPS staff buildings. Read the entire page →
From page 66... ... 66 Design Practices for Rock Slopes and Rockfall Management • State or interstate • Slope Rating Form (USMP) • Interstate • All primary highways (interstate, U.S., and state) Read the entire page →
From page 67... ... Survey Responses 67 • 90–95 • 95 • 90 • 98 • 95 • 90 Percentage of rockfall impacting in roadway ditch. (N/As not included.) Read the entire page →
From page 68... ... 68 Design Practices for Rock Slopes and Rockfall Management • Adopted roadway template is 10'. Not a specific function of Geotech. Read the entire page →
From page 69... ... Survey Responses 69 • Hopefully reduce it; but contain to ditch is the goal. • Informal consideration. Read the entire page →
From page 70... ... 70 Design Practices for Rock Slopes and Rockfall Management • Secondary roadway mitigation • U.S. or state route • Non-Interstate routes • Existing rock cut Percentage of rockfall contained by roadside ditch. Read the entire page →
From page 71... ... Survey Responses 71 Target "scoring" of evaluation systems (RHRS, condition assessments, etc.) Read the entire page →
From page 72... ... 72 Design Practices for Rock Slopes and Rockfall Management Constructability 23 5 3 1 0 32 Construction funding sources versus maintenance funding sources 7 10 7 6 2 32 Long-term maintenance 13 13 5 1 0 32 Asset management 5 6 12 6 1 30 Aesthetics 3 10 9 5 5 32 Life-cycle costs 2 19 6 2 2 31 Resilience initiatives 2 8 12 5 4 31 Risk management plans 5 8 12 3 2 30 Other: 1 0 2 0 0 3 Comments: Roadway design and alignment generally drive the slope design, and geotechnical considerations override only when issues are too large to readily overcome cheaply. The question or some of the categories are not clear or not understood. Read the entire page →
From page 73... ... Survey Responses 73 Resilience initiatives 2 13 10 2 3 30 Risk management plans 4 10 11 3 3 31 Other: 0 2 0 0 0 2 Comments: Cost can drive the technical consideration. The question or some of the categories are not clear or not understood. Read the entire page →
From page 74... ... 74 Design Practices for Rock Slopes and Rockfall Management Department policy; community outreach, environmental concerns [. Read the entire page →
From page 75... ... Survey Responses 75 Q5: Please rank the relative importance, with 1 being the most important and 5 being the least, of the following risk considerations for new cut slopes. Equal factors can be given the same number. Read the entire page →
From page 76... ... 76 Design Practices for Rock Slopes and Rockfall Management Liability concerns related to poor performance 10 13 2 7 0 32 Risk acknowledgment and sharing between designer, owner, and contractor 7 6 7 6 6 32 Q7: Please evaluate the relative frequency of use for the following technical design tools. Please fill in the approximate percentage each design tool is used for design of new cut slopes when rock is exposed in existing cuts. Read the entire page →
From page 77... ... Survey Responses 77 Q8: Please evaluate the relative frequency of use for the following technical design tools. Please fill in the approximate percentage each design tool is used for design of new cut slopes when rock is minimally or not exposed in existing cuts. Read the entire page →
From page 78... ... 78 Design Practices for Rock Slopes and Rockfall Management Rope-based reconnaissance 21 654 31 Geotechnical drilling 27 876 32 Geotechnical instrumentation 7 197 30 Geophysical methods 18 572 32 Specialized rock laboratory testing (unconfined compressive strengths, petrographic analysis, discontinuity sliding friction, JRC, JCS, etc.) 30 931 31 Oriented borehole imagery or oriented coring 6 184 30 Rock mass characterization methods (RMR, SMR, GSI, RQD, etc.) Read the entire page →
From page 79... ... Survey Responses 79 USMP; relies on partner data and knowledge. Geologists, who are few, have done the monitoring; with some districts having no geologists, little tracking has been done. Read the entire page →
From page 80... ... 80 Design Practices for Rock Slopes and Rockfall Management Q4: If applicable, what lessons has your department learned regarding rock slope and rockfall mitigation design in the past 10 to 20 years? (Comment only.) Read the entire page →
From page 81... ... Survey Responses 81 We have very few significant rock cuts. Our biggest concerns and problems occur when geometric/environment/ROW requirements conflict with rock cut design requirements. Read the entire page →
From page 82... ... 82 Design Practices for Rock Slopes and Rockfall Management Comprehensive site characterization is the most important element of any rockfall mitigation or rock cut design project. Experience in construction is paramount to designers. Read the entire page →

From page 60...

... 60 Survey Responses A P P E N D I X B Part C: Rock Slope and Rockfall "Demographics" Q1: How many road miles is your agency responsible for? (Self-Reported)