, .3.9:
-1, -12, 600480; -15; -3.D =100
: = 70, == 70; =60. 6,69 /3
:
1. (1)
∑Fi = 1000/ρ μ * /n (τ √2gH) (1),
: ∑Fi - , ρ- ,
μ ( μ=0.6, - μ=0.5). =- , τ- , g- = 981 2/, i- . n - .
.3.9. ,
1.1. :
1= 70+20+50=140
2= 140+115=255
3=255+115= 370
1.2. . , (2)
= i (h0)2/ h0 (2)
i
h0- ; h0-
1=140- 2500/100 = 140-25=115
02 =255 -25=230
03 = 370-25 =345
2.
75% =1211.25=13.25
3.
.. [ 2 ]
τ =3.7* 0,38 (3)
τ =3.7*13.250,38 = 9,8
4. (1)
4.1. ∑F1= 1000/6.69/0.6 * 13.25/(3*9.8 √2*981 *14 =0,672
4.2. ∑F2= 1000/6.69/0.5 * 13.25/(3*9.8 √2*981 *25.5=0,602
4.3 ∑F3= 1000/6.69/0.5 * 13.25/(3*9.8 √2*981 *34.5 =0,512
5.
∑F =2*0,67/4 + 2*0,6/4 + 2*0.51/4= 0,892
6. (.3.9), . -/22. , 5
(F4 .3.18) . :
. F4≥ ∑F =0.892
, , 10-20% , . 10%
F4 =0,982 (. . .3.18)
F4 =0,982 1,082, 2 , 3.18.(=6)
|
|
1-2 , , 4 (=8). , .3.10.
. 3.10 ()
7. .
(. 3.11), . , , .
.3.11. .
( .3.19)
3.15
- | Sn 2 | Sp 2 | m / | G | |||||||||||||||||||||
A | B | C | D ǿ | E | F | G | H | I | K | L | M | ||||||||||||||
2.2 | 1.9 | ||||||||||||||||||||||||
4.2 | |||||||||||||||||||||||||
6.8 | 4.3 | ||||||||||||||||||||||||
5.9 | 2.7 | ||||||||||||||||||||||||
3.15
13.8 | 7.7 | 3. | ||||||||||||||
18.3 | 9.7 | 4.2 | ||||||||||||||
21.6 | 4.9 |
Sn- N;Sp P; m () /;G-
(.3.19).
75 %
= 13.25, τ = 9,8. ()
m = / τ = 13.25/9.8 =1.35/
, .3.15 2
-
, , . ( , , .
.