岩质边坡稳定性分级方法的连续函数修正及其应用

MODIFICATION OF ROCK SLOPE STABILITY CLASSIFICATION SYSTEMS BY CONTINUOUS FUNCTIONS AND ITS APPLICATIONS

为了消除离散函数取值的主观判断性,采用连续函数对岩质边坡稳定性分级方法中的定量化参数(如岩石强度指标PLS和UCS、岩石质量指标RQD、不连续面间距指标Js以及不连续面方向修正系数F1,F2和F3等)取值进行较全面、系统地修正。34个水电边坡实例的分析结果表明,采用连续函数与离散函数获得的RMR,SMR及CSMR值十分接近,相关系数分别为0.96,0.90,0.85;且连续函数获得的RMR,SMR及CSMR值与边坡安全系数的相关性更高。因此,在工程实践中,完全可以用连续函数代替离散函数对岩质边坡进行更有效的稳定性分级评价。

In order to decrease individual judgements caused by the discrete functions in the rock slope stability classification systems, the quantitative indexes of the systems, such as rock strength index（PLS or UCS）, rock quality designation index（RQD）, discontinuity spacing index（Js） and the correction factors of discontinuity direction, i.e. F1, F2 and F3, are systematically modified by continuous functions. The analytical results of 34 typical hydropower engineering rock slopes show that the values of the rock mass rating（RMR）, slope mass rating（SMR） and Chinese slope mass rating（CSMR） obtained by continuous functions agree well with the values obtained by origin discrete functions, and the correlation coefficients between them are 0.96, 0.90 and 0.85, respectively. Moreover, there are stronger correlations between the values obtained by the modified functions and the factors of safety of the slopes. This verifies the rationality and reliability of the modification method. Thus, it can replace the origin method to effectively evaluate the stability of rock slope in practice.