武汉科技大学2020年《821土力学》考研专业课真题试卷【含参考答案】

4
2
1. 15
(4
70 )
125 3 180 120 60
=120/2.6=46.2cm3
125 46.2 78.8 3
60 60 3 1
60
1
50%
3
120
2
=10*120/125=9.6KN/m3
3
78.8
3
1.71
3
46.2
78.8
4
100%
100% 63%
3
125
60
5
100%
100% 76.1%
2
2
1 6 25 1 6 150( / )
3
1
G2
o
2
(3 1) 2
2.5( )
2
1
1 1 2 2 150 1.33 150 2.5 4.81 1.6
2
60 2
5 2
( 1 2 ) 0.4 (150 150) 2 1.3 60
5
3
1 f ' 1 u f =612-160=452 kPa
2
3 f ' 3 u f =300-160=140 kPa
2
1f '
3 f ' tan2 45o
' 2
2c ' tan 45o ' 2
2
=0
=32°
3
4. 20 1m
1
1
1
(3 1) 6 25 6 150( / ) 2
3
G1
o
2
1
(3 1) 1.333( ) 3
3
78.8
2. 15
A
l/b=2 z/b=2.5
t2=0. 044
2
200×0.044=8.8kPa
2
A
l/b=4 z/b=5
t2=0.0256
2
100×0.0256=2.56kPa
2
A
l/b=2 z/b=2.5
t2=(0. 098+0.089)/2=0.0935
2
100×0.0935=9.35kPa
2
8.8+2.56+9.35=20.71kPa
3
3. 20
1
1f = 3 +( 1- 3) =150+156=306 kPa
2
1f
3 tan2 45o
cu
2
2ccu tan 45o
cu
2
3
=0
=20°
3
2
1f
3 tan2 45o
cu
2
2ccu tan 45o
cu
2
=300*tan2 45+20/2 =612 kPa
2020
B)
(5
2
10 )
DDCAB
( 10
2
20 )
××××
×
( 10
1
10 )
1.
2.
3.
4.
5.
(5
8
40 )
1. 8
1
2
2
2
3
2
4
2
2. 8 3
2
3 3. 8
5 3
4. 8 1 e-lgp
2 3B
1A2
A3
e-lgp
e-lgp
5.Βιβλιοθήκη Baidu8
p-s P-s
AA e-lgp
A1
A2
2
B
2
2
2