Abstract: Sensitivity analysis is an important aspect in the research of loess slope stability. Based on the theory of grey correlation analysis, six factors including slope height, slope ratio, bulk density, cohesive force, internal friction angle and earthquake action were considered in studying the effect on the stability of loess slope. The loess slope of Lanzhou area was taken as a case study. Results show that cohesive force and internal friction angle have the most sensitive effect on the stability of loess slope, followed by bulk density and seismic action; while the influences of slope height and slope ratio are insignificant. Grey correlation degree method is convenient and practical for the stability analysis of loess slope as it accurately reflects the degree of factors affecting the safety coefficient, and moreover, the analysis results can be quantified and the primary and secondary factors are clearly identified. The conclusion provides reference for the treatment and design of loess slope in Lanzhou.

Key words: loess slope, slope stability, grey correlation analysis, correlative degree, sensitivity analysis