Design Practices for Rock Slopes and Rockfall Management (2022) / Chapter Skim
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From page 13... ...
13 State of the Practice The state of the practice described in this synthesis is determined with a questionnaire designed for completion in about 30 minutes. The questionnaire was administered with an Internet-based survey tool and disseminated to lead geotechnical personnel in all 50 state DOTs, Puerto Rico, Washington D.C., and the offices of Western, Central, and Eastern FLHD (WFLHD, CFLHD, and EFLHD)
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14 Design Practices for Rock Slopes and Rockfall Management programs. These states' rock slope density ranges from approximately 18 to 50 rock slopes per 100 miles of highway.
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State of the Practice 15 current DOT design standards, when they may have come into e ect, their formality, and their future policy development plans. Of the rock slope respondents, all had some sort of informal or formal design standards in place or are considering adopting formal standards with documentation.
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16 Design Practices for Rock Slopes and Rockfall Management The survey asked participants if their DOT standards differed based on road classification (e.g., highway system, functional classification) or other metrics (e.g., traffic volume)
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State of the Practice 17 four, 95% (OH, NJ, WY, PA) ; and seven, 90% (ID, ME, NC, NY, TN, WI, WFLHD)
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18 Design Practices for Rock Slopes and Rockfall Management Probabilistic approaches were cited by two DOTs. Less than 1% probability was noted by one DOT but was not affiliated with a specific consequence, such as roadway impedance, accident, or injury.
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State of the Practice 19 failure, with about 94% (31 of 33) of respondents indicating this as a "most important" component for new rock cuts and about 79% (26 of 33)
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20 Design Practices for Rock Slopes and Rockfall Management Figure 16. Survey responses for agency's percentage of projects that consider aesthetics in the design process.
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State of the Practice 21 rock outcrops. Likewise, use of geophysical methods, specialized laboratory testing, and instrumentation is higher where rock is not exposed in outcrop.
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22 Design Practices for Rock Slopes and Rockfall Management volumes. However, several DOTs observed that over the years the importance and success of rockfall mitigation projects has been recognized by department management and consideration of rockfall for highway projects has increased.
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State of the Practice 23 Comprehensive Data Acquisition Another common lesson learned was the importance of having a rock slope inventory and comprehensive site characterization of rockfalls and cut slopes for selection and design purposes. GAM and/or RHRS programs can help with funding and directing it to areas where safety or reliability improvements provide the greatest benefit.
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