High and steep slope block instability risk quantitative evaluation method

A high and steep slope block instability risk quantitative evaluation method comprises the following steps: S1, numbering all unstable bodies on a high and steep slope in sequence; s2, analyzing and calculating a stability coefficient, a volume scale, a relative height, an influence object and a contact frequency characteristic of each block; s3, establishing a risk assessment factor weight coefficient ai and a scoring standard according to engineering characteristics, and performing scoring xi on the risk assessment factor in combination with the block feature value calculated in the step S2;and S4, calculating a risk value f (x) = Sigma (ai * xi) of each risk assessment factor, i.e., the sum of products of the weight coefficient ai of each risk assessment factor and the factor assignment xi, and grading the instability risk of the unstable body according to the risk values. The method is simple, and is especially suitable for a large number of blocks; various factors are comprehensively considered, and the