Comparison of Rating Systems for Alberta Rock Slopes, and Assessment of Applicability for Geotechnical Asset Management

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY Geosciences (Switzerland) Pub Date : 2023-11-14 DOI:10.3390/geosciences13110348
Taylor Del Gerhard Wollenberg-Barron, Renato Macciotta Pulisci, Chris Gräpel, Kristen Tappenden, Roger Skirrow
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Abstract

In 1999, Alberta Transportation and Economic Corridors (TEC) implemented the Geohazard Risk Management Program (GRMP) to identify, assess, monitor, and prioritize the mitigation of risk resulting from geohazard events at specific sites along the provincial highway network. The GRMP was developed to address a variety of geohazard types including rockfall hazards that occur at natural and constructed (cut) highway backslopes. An evaluation of various methods for the condition assessment of rockfall geohazards, including TEC’s current GRMP risk rating system, has been completed with the intent of better understanding the suitability of each method as TEC transitions to a formalized GAM program. The GRMP risk rating values for selected rockfall geohazard sites along highway corridors in Alberta were compared to values developed from the results of five established rock mass and rock slope rating systems. The results of this study demonstrate that TEC’s current GRMP risk rating system is a viable tool for the condition assessment and performance monitoring of rockfall geohazards, which could be utilized within a formalized GAM program, further benefitting from years of recorded application in Alberta. Of the other rating systems tested, the rockfall hazard rating system (RHRS) showed a strong correlation with the GRMP risk rating while Q-Slope, the Geological Strength Index (GSI) and Rock Mass Rating (RMR) correlation were marginal but displayed a potential for use as condition assessment tools. The work presented in this paper provides the first evaluation of rock slope rating systems for rockfall hazards along corridors in Alberta, directly comparing them to the slope performance as observed by TEC in a quantitative manner.
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艾伯塔省岩质边坡等级体系比较及岩土资产管理适用性评价
1999年,艾伯塔省交通和经济走廊(TEC)实施了地质灾害风险管理方案(GRMP),以确定、评估、监测省公路网沿线特定地点的地质灾害事件造成的风险,并确定减轻风险的优先次序。GRMP的开发是为了解决各种地质灾害类型,包括发生在自然和建造(切割)公路后坡的岩崩灾害。对各种岩崩地质灾害条件评估方法的评估,包括TEC目前的GRMP风险评级系统,已经完成,目的是更好地了解每种方法的适用性,因为TEC过渡到正式的GAM程序。对阿尔伯塔省公路走廊沿线选定的岩崩地质灾害地点的GRMP风险评级值与五个已建立的岩体和岩石边坡评级系统的结果进行了比较。这项研究的结果表明,TEC目前的GRMP风险评级系统是一种可行的工具,用于岩崩地质灾害的条件评估和性能监测,可以在正式的GAM计划中使用,进一步受益于阿尔伯塔省多年的记录应用。在测试的其他评级系统中,岩崩风险评级系统(RHRS)与GRMP风险评级显示出很强的相关性,而Q-Slope、地质强度指数(GSI)和岩体评级(RMR)相关性不大,但显示出作为条件评估工具的潜力。本文提出的工作提供了阿尔伯塔省沿走廊岩崩危险的岩石边坡评级系统的首次评估,直接将其与TEC观察到的边坡性能进行定量比较。
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来源期刊
Geosciences (Switzerland)
Geosciences (Switzerland) Earth and Planetary Sciences-Earth and Planetary Sciences (all)
CiteScore
5.30
自引率
7.40%
发文量
395
审稿时长
11 weeks
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