Modeling of pore pressure in a railway
embankment
Marcus Vestman
Civilingenjör, Väg- och vattenbyggnad
2018
Luleå tekniska universitet
1.
INTRODUCTION ... 1
2.
BACKGROUND AND MOTIVATION ... 3
2.1.
C
ONSOLIDATION... 3
2.2.
V
OLUME AND PORE WATER PRESSURE CHANGES... 4
2.3.
S
HEAR TESTS... 5
2.4.
S
HEAR WAVES... 7
2.5.
P
ROBLEMS WITH DISSIPATION OF EXCESS PORE PRESSURE... 8
2.6.
A
IM ANDO
BJECTIVES... 9
2.7.
S
IMPLIFICATIONS... 9
3.
METHOD ... 11
3.1.
M
ODEL... 11
3.1.1.
Design ... 11
3.1.2.
Material parameters... 13
3.1.3.
Model procedure ... 14
3.1.4.
Model differences ... 17
3.1.5.
Model specification – Mohr Coulomb ... 18
4.
RESULTS AND ANALYSIS ... 19
4.1.
M
EASURING POINTS... 19
4.2.
E
XCESS PORE PRESSURE... 21
4.2.1.
Effective stress ... 24
4.2.2.
Displacement ... 25
4.3.
M
ODEL RELIABILITY... 27
5.
DISCUSSION ... 29
6.
CONCLUSION AND FUTURE WORK ... 31
6.1.
C
ONCLUSION... 31
6.2.
F
UTURE WORK... 31
𝑞(𝑡) = 𝐿 sin(𝜔𝑡)
𝑞(𝑡)
𝐿
𝜔
64 kPa
0 10 20 30 40 50 60 70 80 90 100 0, 001 0, 005 0, 01 0, 063 0, 125 0, 25 0 ,5 1 2 4 8 16 31, 5 63 200 0, 074 5 ,6 11, 3 22, 6 45 0, 001 0, 002 0, 0063 0, 02 0, 063 0 ,2 0, 63 2 6 ,3 20 63 200 Ler a S ilt F in silt M e lla n silt Gro vs ilt Sand Fi ns and M el lans and Gr ov s and Gr us Fi ngr us M el langr us Gr ov gr us St en Kor ns tor lek d ( mm ) Pa ss era nd em än gd ,v ik tp ro ce nt M.L 1483+900( 2) s pm 2, 0-3, 0 Gr us ig s a ndig s ilt 584 3B/ 2* 1, 963 12, 663 Sek tion Bor rhål P ro v-bet ec k ni ng Dj up (m) Gäl ler mel lan ( m) Benämni ng Si k tat Pr ov (g) Gl ödgn. -fö rlu st % M trl % > mm T jä l-far lighet d10 d60 d90 *=AM A Anl äggni ng 13 V a tte n kv o t 7 ,0 2 %
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0 10 20 30 40 50 60 70 80 90 100 0, 001 0, 005 0, 01 0, 063 0, 125 0, 25 0 ,5 1 2 4 8 16 31, 5 63 200 0, 074 5 ,6 11, 3 22, 6 45 0, 001 0, 002 0, 0063 0, 02 0, 063 0 ,2 0, 63 2 6 ,3 20 63 200 Ler a S ilt F in silt M e lla n silt Gro vs ilt Sand Fi ns and M el lans and Gr ov s and Gr us Fi ngr us M el langr us Gr ov gr us St en Kor ns tor lek d ( mm ) Pa ss era nd em än gd ,v ik tp ro ce nt M.L 1484+625 w 0, 0-1, 0 Sa ndi g GRUSMORÄN 920 2/ 1* 0, 066 3, 359 15, 743 Sek tion Bor rhål P ro v-bet ec k ni ng Dj up (m) Gäl ler mel lan ( m) Benämni ng Si k tat Pr ov (g) Gl ödgn. -fö rlu st % M trl % > mm T jä l-far lighet d10 d60 d90 *=AM A Anl äggni ng 13
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Master Thesis
Appendix 1
20180525
6/10
0 10 20 30 40 50 60 70 80 90 100 0, 001 0, 005 0, 01 0, 063 0, 125 0, 25 0 ,5 1 2 4 8 16 31, 5 63 200 0, 074 5 ,6 11, 3 22, 6 45 0, 001 0, 002 0, 0063 0, 02 0, 063 0 ,2 0, 63 2 6 ,3 20 63 200 Ler a S ilt F in silt M e lla n silt Gro vs ilt Sand Fi ns and M el lans and Gr ov s and Gr us Fi ngr us M el langr us Gr ov gr us St en Kor ns tor lek d ( mm ) Pa ss era nd em än gd ,v ik tp ro ce nt M.L 1484+625( 2) w 1, 0-2, 0 Sa ndig grus ig s ilt ig MORÄN 1082 3B/ 2* 1, 618 11, 494 Sek tion Bor rhål P ro v-bet ec k ni ng Dj up (m) Gäl ler mel lan ( m) Benämni ng Si k tat Pr ov (g) Gl ödgn. -fö rlu st % M trl % > mm T jä l-far lighet d10 d60 d90 *=AM A Anl äggni ng 13
Pro
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Ris
kin
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pd
ra
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nr:
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Pro
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Da
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20
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Lö
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48
Gra
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k./
Sig
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fö
rd
eln
in
g
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