Using the Information Quantity Method to Assess the Regional Risk of Highway Slope to Improve the Level of Risk Management

Table 2

The risk assessment factor table of artificially excavated slopes on the national and provincial highways in Quzhou City.

Evaluation factors		Factor classification	Classification coding	Number of grid cells				The amount of information	Corrected amount of information	Sorting
				Ni	N	Si	S
Geometric factors	Slope excavation height F9	Soil slope ≤6 m; rock slope ≤8 m	1	31	194	258	833	−0.661796897		29
		Soil slope 6–10 m; rock slope 8–15 m	2	80	298	258	833	−0.142992795		22
		Soil slope 10–20 m; rock slope 15–30 m	3	124	286	258	833	0.336363812		14
		Soil slope 20–40 m; rock slope 30–60 m	4	21	55	258	833	0.209263310		18
		Soil slope >40 m; rock slope >60 m	5	0	0	258	833	—		—
	The slope excavation angle F10	Soil slope ≤32°; rock slope ≤42°	1	6	60	258	833	−1.130511036		32
		Soil slope 32–37°; rock slope 42–49°	2	43	118	258	833	0.162589548		19
		Soil slope 37–42°; rock slope 49–58°	3	69	161	258	833	0.324776197		15
		Soil slope 42–48°; rock slope 58–67°	4	36	152	258	833	−0.268287525		26
		Soil slope >48°; rock slope >67°	5	102	342	258	833	−0.037763867		21
Internal factors	Slope deformation history and the present situation F11	No	1	100	657	258	833	−0.710439775		31
		Slight	2	109	128	258	833	1.011391676		5
		Medium	3	47	48	258	833	1.151020648		4
		Serious	4	2	29	258	833	−1.502074592	1.502074592	1
	The compactness of soil slope F12	Dense	1	0	6	258	833	—		—
		Medium dense	2	0	9	258	833	—		—
		Little dense	3	1	1	258	833	1.172074057		2
		Loose	4	0	1	258	833	—		—
	Soil slope moisture state F13	Hard	1	1	17	258	833	−1.661139287		33
		Hard plastic	2	0	0	258	833	—		—
		Plastic	3	0	0	258	833	—		—
		Soft plastic	4	0	0	258	833	—		—
	Rock hardness degree of rock slope F14	Hard rock	1	5	31	258	833	−0.652475235		28
		Relatively hard rock	2	0	0	258	833	—		—
		Relatively soft rock	3	12	76	258	833	−0.673752633		30
		Soft rock	4	148	584	258	833	−0.200614652		24
		Extremely soft rock	5	90	125	258	833	0.843569990		8
	Development degree of structure surface of rock slope F15	Good	1	129	605	258	833	−0.373341996		27
		General	2	93	143	258	833	0.741828920		9
		Relatively poor	3	31	63	258	833	0.462926535		12
		Poor	4	2	5	258	833	0.255783325		16
		Extremely poor	5	0	0	258	833	—		—
External factors	Surface drainage F16	Facilities are complete	1	125	480	258	833	−0.173398309		23
		Facilities are relatively complete	2	17	141	258	833	−0.943472489	0.943472489	6
		Facilities are not complete	3	38	84	258	833	0.378843418		13
		Lack of facilities	4	76	128	258	833	0.650777134		11
	Underground drainage F17	Facilities are complete	1	129	376	258	833	0.102297318		20
		Facilities are relatively complete	2	24	192	258	833	−0.907367484	0.907367484	7
		Facilities are not complete	3	103	265	258	833	0.227073219		17
		Lack of facilities	4	0	0	258	833	—		—
	Degree of slope protection engineering diseases F18	Good	1	181	716	258	833	−0.203109078		25
		General	2	71	113	258	833	0.707366116		10
		Relatively poor	3	4	4	258	833	1.172074057		2
		Poor	4	0	0	258	833	—		—
		Extremely poor	5	0	0	258	833	—		—