岩质高边坡运营安全风险评估指标体系研究

Research on index system of risk assessment on operation safety of high rock slope

为建立高速公路岩质高边坡风险评估指标体系,针对指标选取代表性不足、指标分级阈值缺少定量判据、指标获取困难等问题,采用逐坡普查与重点调查、工程地质类比与复核、现场监测与数值计算相结合的方法,提出了岩质高边坡运营安全风险评估指标体系。包括边坡断面几何特征、水的影响、边坡岩体结构、支挡加固设施及边坡破坏模式等5个一级指标与坡高、坡度等15个二级指标,并确定了量化分级标准与取值方法。评估结果表明:指标体系适用性较强,为后续评估运营安全风险奠定了基础。

In order to establish the risk assessment index system of high rock slope in expressway, aiming at the problems a- bout the insufficient representativeness of index selection, the lacking of quantitative criterion for the index grading threshoht, and the difficult index acquisition etc. , an index system of risk assessment on operation safety of high rock slope was put for- ward by using the combined methods of the general investigation on slope one by one with the key survey, the engineering ge- ology analogy with the review, and the field monitoring with the numerical calculation. The index system includes five first - level indexes, which are the geometrical characteristics of slope section, the water impact, the rock mass structure of slope, the support and reinforcement facilities, and the slope failure mode, as well as fifteen second - level indexes, which are slope height, slope gradient, and so on. The quantified grading standard and the value taking method were determined. The as- sessment results showed that the index system has a relatively strong applicability, which provides a basis for subsequent risk assessment on operation safety.