详情

原文传递 Development of a Rockfall Hazard Rating Matrix for the State of Ohio. Final rept.

题名：	Development of a Rockfall Hazard Rating Matrix for the State of Ohio. Final rept.
作者：	SHAKOOR, A.; WOODARD, M. J.
关键词：	Rock-falls; Landslides-; Slope-stability; Ranking-.;Roadside-hazards; Remediation-; Rockslides-; Geology-; Risk-analysis; Geologic-structures; Erosion-; Rock-mechanics; Ohio-; Statistical-analysis; Slope-protection; Roadside-maintenance; Safety-management; Research-projects; Prioritization-.
摘要：	Although Ohio is not considered a mountainous state, it is well documented that rock falls are prevalent. Rock falls pose a considerable risk to traffic safety, create maintenance problems, and exert a strain on limited maintenance funds available to the Ohio Department of Transportation (ODOT). In order to assist ODOT in their prioritization for remediation work, a relative rock fall hazard rating matrix has been developed. 108 sites along Ohio roadways were characterized for their geology, geometry and traffic characteristics. As compared to other states where rating systems have previously been developed, Ohio geology can be characterized as relatively flat lying alternating sequences of durable and nondurable sedimentary rocks. Because of this, the matrix focuses on differential weathering and undercutting present at road cuts. Data was collected for all sites and was statistically analyzed, using univariate, bivariate, and cluster analyses, to determine significant variables that characterize slopes. Statistical analyses indicated that slake durability index (SDI), slope angle, and slope height were the most significant variables in differentiating between sites. A matrix was developed based on the statistical analysis and information gained from previously developed rating systems. Geologic parameters include geologic conditions (SDI and maximum amount of undercutting; discontinuity extent/orientation and joint roughness), potential block size, and hydrologic condition. Geometric parameters were evaluated through a comparison of actual field conditions to prescribed Ritchie catchment ditch design. Traffic parameters included average daily traffic, percent decision site distance, and pavement with information about rock fall history was unavailable for this research project, but its importance has been well documented. For this reason, a subjective assessment of rock fall history has been included.
报告类型：	科技报告