13

(1) (Rock mass classification -A practical approach in civil engineering )

. , , , , , ,

.

- RMR (Rock Mass Rating)

- SMR (Slope Mass Rating)

- Q-system

- RQD (Rock Quality Designation)

- TCR (Total Core Recovery)

- RSR (Rock Structure Rating)

(2) RMR

. Bieniawski(1989)

. 5 1 6

0~100 ( 2-1, 2-2)

- 5 : , , , ,

- 1 :

2-1 RMR

1

(MPa)>10 4~10 2~4 1~2

(MPa)>250 100~250 50~100 25~50 5~25 1~5 5mm

30 25 20 10 0

5

10m

125

/0 0.5

15 10 7 4 0

14

2-2 RMR

81~100 61~80 41~60 21~40

15

NX (BX )

TCR(%) RQD(%)

20%

(5% )

10%

(0%)1:1~1:1.2

5m

1m

-

20m

3m

-

-

()

20~40%

(10~30%)

10~25%

(0~10%)1:0.8~1:1

10m

1~2m

()

40~60%

(30~50%)

25~50%

(10~40%)1:0.7

()

60%

(50% )

50%

(40% )1:0.5

20m

3m

(5)

. , , , (

2-1)

2-1 (, 2004)

16

(6)

.

-

.

.

-

. , () >

() > () ( 2-2)

.

sin cos

cos sintan

c:

A: =cosecU: =

cosec

V: =

W:

:

cot cot

:

cotcottan

2-2

-

. ( 2-3)

. :

17

sin tan

RA, RB: A, B , sin

cossin , sin

sintan

tan

2-3

-

.

( 2-4)

2-4

. (Flexural toppling):

. (Block toppling):

.

tantan

(7)

18

. : , , , ,

( 2-5)

2-5

. :

( 2-6)

2-6 Contouring point density

19

. : ( 2-7)

. :

2-7

(8)

. : , ,

.

.

1m ( 2-8)

. 30m, 29

.

.

.

( 2-9)

20

2-8

2-9

2-10

. 30m 26

. ,

.

. ,

( 2-10)

. 30m 21

.

21

.

-

. , , ,

.

.

.

.

2-11

2-12 ()

- ( 2-11)

. (h') 10m

. (h) 5m

. (H) 30m

.

- : ( 2-12)

. (a: )

. (b: )

. (c: )

f. , nd: , : , nd>4: , nd 1

22

- ( 2-13)

. : tan tan. : tan. :

tan

R: , W1, W2: (), :

, : N1, N2 , L: (L=R/180), G1, G2: ,

T1, T2: , N1, N2: , : , c: ,

Fs:

. Fs 1.0 , Fs = 1.0~1.2 , Fs = 1.3~1.4 , , , Fs 1.5

-

tantan

: , i:

2-13 ()

.

. : ,

. :

( , )

. : , , ,

H-pile sheet-pile,

. :

.