Fuzzy Comprehensive Evaluation Method of Masonry Structure Safety Based on Grey Clustering Theory

Table 6

Evaluation criteria of clustering indexes of the subgrade.

Grey class	Bearing capacity; or	Deformation^①	Stability
	≥1.0	≤0.001	The foundation is very stable, no signs of sliding or no sliding history.
	≥0.95	≤0.002	There was a history of local sliding, which stopped after treatment, and according to recent evaluation, the foundation will not slip under normal conditions.
	≥0.90	≤0.005	There was a slide, which is stopped now, but it may still slip if the inducing factor is touched.
	<0.85	>0.008	There had a slide, and there is still a sliding or a tendency to slip.

Note. : the standard combination value for average pressure of foundation base; : the standard combination value for maximum pressure of the edge of foundation base; and : the characteristic value of the bearing capacity of foundation. the deformation refers to uneven settlement.