, , . . , . , .
, . , , .
, . .4.9.
, () , .
4.9
/ | . | ||
. | , | ||
δ=300500 | |||
Ø2030 [ 12...16 . 25 | |||
Ø2030 Ø2030 L 1008 (L 14010) |
, , . .
, . , . , - . .
, . , .
, , 70x80 , .
, , - , , , , . , ,
|
|
N=0,2Rsqlδ
Rsq - ;
l, δ - ;
0,2 - () .
, . , . , , , , .
() () , .
:
- ;
- ;
- .
:
I - . ( ) . .
II - - . .
III - . () . .
IV ( ) - - . , " ".
(I )
- , - . , - l1 , - l2 (.4.1). . . , , . , (. 4.2).
|
|
, . - , : σa σc, σb (.4.3). 0 N. , l1 l2 .
, .
(4.1)
, , :
(4.2)
= - , ;
b - .
. 4.1.
. 4.2.
:
(4.3)
. , σ0:
(4.4)
S, Sb, S0 - A, σ0 t0 t=∞.
(4.1)-(4.4) σa, σb, σc, :
(4.5)
a b - , t0 t = ∞, 7,48 [41]
.
, (4.6), :
, (4.7)
ν - ;
(4.8)
h - :
h=Awb, (4.9)
Aw - ;
b - .
, (4.10)
f - ;
γw - .
(4.5) :
= , (4.11)
D - ;
DM - , D , , .
:
(4.12)
(4.12) , = 0 , -b=0 () l1(l2)=0.
4.1. .
, , 24 . . l1 = 6, l2 = 18 (.4.4). b = 1 . σ0 = 150 . - : = 16 , = 20 , f = 510-10 /, ν = 0,4.
1 : t0 = 3,15107 .
.
.4.3. () ,
.4.4.
, [42, . 5.6]:
- = 6 =4,0;
- = 18 > 10 =4,58.
(4.9):
h1= 41=4 ; h2= 4,581=4,58 .
|
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(4.6)-(4.9), :
2/;
2/;
2/;
.
, , , (4.12)
, h = 6 ,
N= = 26,23 .
( Rs=210 )
= 1,27 2.
Ø12, s = 2,26 2. .4.4.
(II )
. , (.4.5).
, , , , (.4.6).
. (4.13)
, .
= 0, (4.14)
= - , ;
b - .
:
(4.15)
. , :
(Sa-Sb)(l2+l1) = (Sb-Sa)(l2-l1). (4.16)
.4.5.
.4.6. ()
(4.13)-(4.1) σa, σb, σc, :
(4.17)
Kb - , 1 t0 ∞ (4.6).
(4.17) :
(4.18)|
4.2. .
, , 22 . ; 2,8 . b = 1 . , , . l1 = 10 , l2 = 12 (.4.7). σ0 = 180 . 6 t0 = 1,58107 .
- = 20 , = 16 , Kf = 510-10 /, ν=0,4.
[42, .5.6] w = 4,58.
h = Awb = 4,581 = 4,58 .
. 4.7.
(4.6)-(4.9), :
2/;
2/;
2/;
2/.
, , , (4.18):
.
, , . , , , , . hT 55,8 .
:
|
|
Rs = 210 :
= 3,71 .
16 s = 4,022. .4.7.
(III )
( ) , . , . (), (.4.8).
, , .
, = 0:
= 0, (4.19)
G2 - .
G2/G1≥3.
4.3. .
, . . δ = 0,51 75 50 (Rsq = 0,112 ). G1 = 350 , l1 = 3 . ( ) . h = 4,2 (. .4.8). G1=G2=1800 .
(. .4.8):
= 125
.3 (Rs = 210 ):
2.
.4.8. :
- ; -
Ø20 As = 6,28 2. :
N ≤ (Rsg + 0,8nμσ0)
. 4.20 -22-81 n = 1, μ = 0,7. σ0 = 0,04 .
: A=30,512+60,51 = 6,12 2.
:
125 < (0,112 + 0,81,00,70,04)1036,12 = 808 .
.
, , , . , .
(IV )
, , . . .
(.4.9) = 0:
NhT-Pfh/6=0, (4.20)
f - , :
(4.21)
σf - , :
(4.22)
σ0 - :
; (4.23)
G1 - ;
A - .
4.4. .
, . 4.3. b = 1 .
l = 5 . 3 . 3- h = 7 . - ; = 21 ; = 24 . σ0 = 0,2 .
.4.9.
, :
- ; -
(4.22), , :
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= 521 + 61 = 16 2.
(4.21):
= 216
(.4.9), :
N = 0,3RsAs.
3 (Rs = 210 ):
= 4.08 2
Ø18, s = 5,09 2.
, 4.3 , . , .
, , . , .
, , .
c(x1, 2,..., xn) = min(m),
xi - .
, . :
= A(l1+l2)γn,
- ;
- ;
- ;
n - ;
γ - .
. ,
- , , (4.6) (4.16);
Rs - ;
hi - , i- .
:
Rsg - ;
l - ;
δ - ;
n, μ - , 4.20 -22-81.
.4.10 - .
, (1-3 ) . ( 30 ) , .
. 4.10. -