|
Abstract Firstly introduced a slope stability probability classification(SSPC) method，which was proposed by Dutch scholar R. Hack，et al[1-3]. The method has two main limitations in the evaluation of rock slope stability of hydropower engineering regions. One is that the method is valid only for the slopes with heights ranging up to 45 m，another is that the estimation of the intact rock strength with broad bands in SSPC has strong subjectivity and randomness. To the two limitations，the shear strength of the slope rock masses is modified by Hoek-Brown strength criterion，and the maximum height of the slopes is calculated by using an empirical formula. The analysis results of 34 typical rock slopes(10 non-structure controlling slopes and 24 structure controlling slopes) of hydropower engineering regions show that the assessment accuracy of the modified method is 61.8% for the all 34 slopes and 80% for the 10 non-structure controlling slopes. So，the modified SSPC method is good for slope stability probability classification and can provide a new way for quick and effective assessment of rock slope in hydropower engineering regions.
|
|
Received: 20 May 2011
|
|
|
|
2011, Vol. 30 
