A New Evaluation Method for Slope Stability Based on TOPSIS and MCS

Table 1

Classification system of slope stability.

Index	Grade
Rock quality designation (RQD) (%)	100–90	I
	90∼75	II
	75∼50	III
	50∼25	IV
	25∼0	V
Joint occurrence of rock mass	The dip direction of joints is opposite to that of slope (90–100)	I
	The trends of joints are perpendicular to the trends of slope (75–90)	II
	The trends of joints are consistent with those of slope but larger than dip angle of slope (50–75)	III
	The trends of joints are consistent with those of slope but less than dip angle of slope (30–50)	IV
	The trends of joints are consistent with those of slope but less than dip angle of slope, and there are weak interlayers (0–30)	V
Geo-stress (MPa)	0∼2	I
	2∼8	II
	8∼14	III
	14∼20	IV
	20∼25	V
Cohesion (c) (MPa)	0.32∼0.22	I
	0.22∼0.12	II
	0.12∼0.08	III
	0.08∼0.05	IV
	0.05∼0	V
Friction angle (φ) (°)	45∼37	I
	37∼29	II
	29∼21	III
	21∼13	IV
	13∼0	V
Slope height (H) (m)	0∼30	I
	30∼45	II
	45∼60	III
	60∼80	IV
	80∼100	V
Daily maximum rainfall (DMR) (mm)	0∼20	I
	20∼40	II
	40∼60	III
	60∼100	IV
	100∼150	V