Bai Giang Geoslope 2004 Dxh 5.10.2013

2 DINH XUAN HOAN

C S TNH TON

Thng dng nh gi s n nh ca nn ng trn sn dc, da

vo phng php tnh ton trn c s xt iu kin cn bng tnh ca khi

trt trn mt trt d kin (hoc mt trt c iu tra trc).

c ng dng tnh ton n nh mi dc bit phng ca mt

trong khi t hoc bit phng mt gc trn mi t ta vo hay trong

trng hp gp mi t ri khng ng nht.

i. Phng php mt trt gy khc

3 DINH XUAN HOAN

C S TNH TON

Phng php mt trt tr trn c ng dng tnh ton n nh

mi dc khi: Mi dc ng nht, cu to t t dnh vi gi thit khi mt n nh

mi dc s trt theo mt trt tr trn hoc gn ging tr trn.

ii. Phng php mt trt tr trn

4 DINH XUAN HOAN

C S TNH TON

ii.1. Phng php Fellenius (1926)

ni

i

iiii

ni

i

iiiii

ni

i

ti

ni

i

gi

R

ZWP

lCtgP

M

M

K

1

1

1

1

sin

cos

Fellenius a ra gi thit: Khi

trt, c khi trt s cng

trt mt lc. Do , gia cc

mnh khng c lc ngang tc

dng ln nhau, trng thi gii

hn ch xy ra trn mt trt

5 DINH XUAN HOAN

C S TNH TON

ii.2. Phng php Bishop (1955)

V nguyn tc, phng php Bishop

tng t nh phng php Fellenius, ch

khc l mi mnh trt Bishop c xt

thm lc tng tc gia cc mt ng ca

phn mnh trt (khng quan tm n v

tr ca im t ca cc lc ny).

Nu xt cc lc trn th phng php ny

rt phc tp. Nhm n gin ho, Bishop

gi thit cc lc: Vi+1 = Vi-1 v khi

trng thi cn bng th:

ni

i

iiii

ni

i

iii

i

ii

ni

i

ti

ni

i

gi

R

ZWP

mlCtgP

M

M

K

1

1

1

1

sin

cos

1

11

iii tgtg

Km

01 11

11

m

i

m

iii EEE

6 DINH XUAN HOAN

16

33

88

32

t p

t bn

t st

ct cht

4

S LIU HNH HC

M hnh tnh tonNn ng p trn nn t yu vi cc thng s hnh hc cho trn hnh

7 DINH XUAN HOAN

S LIU A CHT THC HNH

M hnh tnh tonNn ng p trn nn t yu vi cc thng s hnh hc cho trn hnh

+ Nn ng: - Bn= 7.5m

- = 19 KN/m2

- C= 0 KN/m2

- = 30

+ Lp 1-1: - = 15.2 KN/m2

- C= 12.44 KN/m2

- = 0

+ Lp 2-1: - = 15.5 KN/m2

- C= 14.24 KN/m2

- = 0

+ Lp 3-1: - = 17.6 KN/m2

- C= 2.62 KN/m2

- = 22

+ Lp 4-1: gc

8 DINH XUAN HOAN

GII THIU MT S PHN MM TNH TON N NH

9 DINH XUAN HOAN

GII THIU PHN MM SLOPE/W 2004

10 DINH XUAN HOAN


Ca s chnh ca chng trnh

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Ca s chnh ca chng trnh

12 DINH XUAN HOAN


Ca s lp tnh n nh mi dc

H s n nh theo

cc phng php H s cn bng

theo iu kin cn

bng lc

H s cn bng

theo iu kin cn

bng m men

S ln lp

Khi ng qu

trnh tnh lp

13 DINH XUAN HOAN


14 DINH XUAN HOAN

1. XC NH BI TON

M chng trnh phn tch n nh Slope/W

Giao din phn mm

GeoSlope 2004

15 DINH XUAN HOAN

2. THIT LP VNG LM VIC

16 DINH XUAN HOAN


2.1 t kch thc trang lm vic:

Thc hin: Set Page- n v bn v chn l mm

- Kh giy A4: 297x210mm

- Chn din tch lm vic l 260x200mm

17 DINH XUAN HOAN


2.2 Thit lp t l bn v

Thc hin: Set Scale- n v k thut chn l meters

- T l ng 1:200, ngang 1:200

- Chn din tch lm vic l 260x200mm

- Problem Extents: nhp kch thc m

rng dng miu t bi ton.

Gc tri bn di s c ta l (-5,-

5) hay gc (0,0) thc t c ta tng

i l (5,5). Do trc ta sau ny to

ra s nm pha trong lm p bn v hn

- V d: 47m= 260200/1000 5

- Trng lng ring ca nc l 9.807

KN/m3

18 DINH XUAN HOAN


2.3 To, hin th li, ch bt im

Thc hin: Set Grid- Mt li: 0.50.5m. Nh vy, khi v

trong Slope mc nh l v vi ng chiu

di thc t, Slope s t quy i ra khng

gian giy.

- Khong cch trn giy: 2.52.5mm

- Hin th li

- Bt im nh cc nh li (khi v vi

ta chn th iu ny cn thit, nhng

vi to l th nn b chn).

19 DINH XUAN HOAN


2.4 V trc ta

Thc hin: Set Axes- Trc ngang: Distance (m)

- Trc tri: Height (m)

- T gi tr Min + Khong gia tng S khong gia tng = Gi tr max (Gi

tr Max ny khng th vt qu c kh giy

20 DINH XUAN HOAN

3. PHC HA BI TON

3.1 Phc ha bi ton bng ng line

Thc hin: Sketch Lines- p dng khi ta cc im l chn

- u mi tn dng End 1 or End 2

- dy ca ng

- Chn Done bt u phc tho

21 DINH XUAN HOAN

3. PHC HA BI TON

3.2 Phc ha bi ton bng cc im

Thc hin: KeyIn Points- p dng khi ta cc im khng chn (Khi

ranh gii gia cc lp a cht khng thng m

gp khc)

- Sau khi c cc im, dng ng Regions

ni cc im (lc ny tt ch bt im)

22 DINH XUAN HOAN

3. PHC HA BI TON

3.3 a File nh hoc File CAD vo bn v

Thc hin: File Import Picture- Save as file CAD v nh dng .dxf ca CAD R12

- a file .dxf v phn mm bng Import Picture

- Scale ng t l bn v: Modify => Pictures... =>

scale... => gn khong cch gia cc im theo

ng khong cch thc.

23 DINH XUAN HOAN

4. THIT LP PHN TCH BI TON

4.1 Thng tin v d n

Thc hin: KeyIn Analysis Settings- Tn d n

- Tng hp cc thng tin chung: ngy

thng, Km0+, phng php phn

tch

24 DINH XUAN HOAN


4.2 La chn phng php phn tch

Thc hin: KeyIn Analysis Settings Method - Limit Equilibrium: Trng thi cn bng

gii hn

- La chn phng php phn tch ph

hp quy trnh

- C rt nhiu phng php, nu chn All

th tnh ton rt mt thi gian

- Quan tm n 3 phng php tnh

25 DINH XUAN HOAN


4.2 p lc nc thy tnh

Thc hin: KeyIn Analysis Settings PWP- Xt n p lc nc thy tnh?

- Chn cch biu din ng p lc nc

theo cch khc nhau

26 DINH XUAN HOAN


4.2 Thit lp hnh thc mt trt

Thc hin: KeyIn Analysis Settings Slip Surface- Hng dch chuyn ca mt trt (c

bit lu dng nn p chn hng

cho ng)

- Cch la chn hnh thc mt trt: vng

giao u giao cui, li tm trt bn

knh trt, khi trt nh sn

- La chn nh hng ca sc cng b

mt n vic xut hin vt nt trong nhm

Tension Crack Option

27 DINH XUAN HOAN



Thc hin: KeyIn Analysis Settings FOS Distribution- Phn phi h s an ton

- C s dng phn tch xc sut vo tnh

ton hay khng?

28 DINH XUAN HOAN



Thc hin: KeyIn Analysis Settings Advanced- La chn mc hi t: nhp s mnh,

sai s cho php ca h s an ton, dy

b mt nh nht.

- La chn ti u ha: s ln lp li ln

nht, sai s hi t

29 DINH XUAN HOAN

5. NH TNH CHT CHO CC LP T

5.1 nh tnh cht cho cc lp t

Thc hin: KeyIn Material Properties

- Nhp s th t lp t

- M hnh tnh ton

- Tn lp t

- Mu sc lp t

- Dung trng, lc dnh, gc ma st trong

- Cc tham s nng cao

- to ra mt lp t mi cn in y

thng tin v kch copy.

Thng s lp t: dat dap

30 DINH XUAN HOAN




- Nhp s th t lp t

- M hnh tnh ton

- Tn lp t

- Mu sc lp t


- Cc tham s nng cao



Thng s lp t: lop 1

31 DINH XUAN HOAN




- Nhp s th t lp t

- M hnh tnh ton

- Tn lp t

- Mu sc lp t


- Cc tham s nng cao



Thng s lp t: lop 2

32 DINH XUAN HOAN


5.1 Gn tnh cht cho cc lp t

Thc hin: Draw Regions- V bao quanh vng t cn gn t tri

sang, t trn xung

- Gn t cho vng va v bng cch

chn vo mc Materia Type

33 DINH XUAN HOAN

6. V NG O P

6.1 V ng o p

Thc hin: Draw Pore - Water Pressure

- Chn tt c cc lp t m nc ngm

c gy nh hng n n

- Nu c tng gc th khng chn nc

ngm cho tng ny

- v ng mc nc kch Draw v v

34 DINH XUAN HOAN

7. NH TM V BN KNH TRT

7.1 nh tm v bn knh trt

Thc hin: Draw Slip Surface Grid / Radius

- Grid: nh li tm trt, tm trt s

chy trn cc mt li nh.

- Radius: nh cc ng m ng trn

t tm trt tip xc vi n

35 DINH XUAN HOAN

8. TNH TON

8.1 Kim tra bi ton

Thc hin: Tool Verify- Kim tra xem c xy ra cc li trc khi

tin hnh phn tch

- Nu xut hin li chng trnh s bo

tng s li v nguyn nhn gy ra li

36 DINH XUAN HOAN

8. TNH TON

8.1 Tnh lp tm h s n nh

Thc hin: Tool SOLVE- Tnh ton lp a ra h s n nh

- Gm 2 ct kt qu: theo trng thi cn

bng m men v cn bng lc

- S mt trt tnh ton10571

37 DINH XUAN HOAN

9. TH HIN KT QU

9.1 Hin th kt qu theo mt trt v tm trt

Thc hin: Window CONTOUR- Hin th tm trt v cung trt nguy

him nht

- xem kt qu theo cc phng php

khc nhau: vo View Method

38 DINH XUAN HOAN

9. TH HIN KT QU

9.1 Hin th kt qu theo mt trt v tm trt

Thc hin: Window CONTOUR- Nhiu trng hp tm trt, bn knh

trt c th nm mp ngoi ca vng

nh ngha. iu ny cha chc cho ta h

s n nh chnh xc ca bi ton

- V vy phi di chuyn vng tm trt,

vng bn knh trt sao cho tm trt

nm gia n

39 DINH XUAN HOAN

9. TH HIN KT QU

9.2 Hin th theo dng ng ng h s n nh

Thc hin: Draw Contours- Phm vi d liu: Kmin, Kmax

- Phm vi ng vin

+ Gi tr K ca ng vin bt u

+ Khong gia tng

+ S ng vin th hin

+ Gi tr K ng vin kt thc

- Ghi nhn cho ng vin K: Draw Contour Labels

40 DINH XUAN HOAN

9. TH HIN KT QU

9.3 Hin th di dng th

Thc hin: Draw Graph- Chn dng th mun v

41 DINH XUAN HOAN

9. TH HIN KT QU

9.4 Cc lc tc dng ln cc mnh

Thc hin: View Slice Information- Kch chn bt k mnh no xem

thng s cc lc tc dng vo mnh

42 DINH XUAN HOAN

10. PH TR

10.1 Xem thng s im trn bn v

Thc hin: View Point Information...- Xem thng s mt im trn bn v

43 DINH XUAN HOAN

10. PH TR

10.2 B hin th cc im, cc s

Thc hin: View Preferences- Bt hay tt cc tn im, s trn bn

v

44 DINH XUAN HOAN

10. PH TR

10.3 Hin th thng s ca lp t

Thc hin: View Material Properties- Kch vo vng Hin th y cc

thng tin v lp t.

- Mun hin th ton b cc thng s ca

tt c cc lp t kch chn All Matls.

- in cc tnh cht ca cc lp t kch

nt Print

45 DINH XUAN HOAN

10. PH TR

10.3 Dn nhn cho cc lp t

Thc hin: Sketch Text- Ghi ch cc thng s cn thit

- Chn Select field Insert nhng

thng s c sn

- Chnh sa ch, c ch

- Cch hin th theo phng ng, ngang

- Cng dng cch ny ghi ch cc

thng tin v d n nh: tn, ngy thng

46 DINH XUAN HOAN

11. NNG CAO

11.1 Khai bo ti trng tp trung

Thc hin: Draw Line Loads- ln ca lc

- Chiu ca lc tc dng

47 DINH XUAN HOAN

11. NNG CAO

11.2 Khai bo ti trng phn b

Thc hin: Draw Pressure Lines- Ch dung trng khai bo phi l dung

trng ca lp t quy i vi b dy hx- Hng ca lc tc dng: vertical hay

normal (dng bt k ty cch v)

- V mt chiu dy lp t quy i ng

bng hx (tnh ton theo 262-2000)

- VD ny ly hx= 1m v = 9.807 KN/m3

48 DINH XUAN HOAN

11. NNG CAO

11.3 Gii php thay t

Thc hin: Modify Objects- Xa vng t v thay vng khc

- V li lp t thay th

- Khai bo thng s cho lp t thay th

- Gn cho lp t thay th

49 DINH XUAN HOAN

11. NNG CAO

11.4 Gii php gia c bng neo

Neo gm c 2 phn:

- Phn t do (Free) thng nm trong

phm vi mt trt

- Phn ngm (Bond) thng nm ngoi

phm vi mt trt l phn to ra ma st

gip cho khi trt gn vo phn t

khng b trt

50 DINH XUAN HOAN

11. NNG CAO


Thc hin: Draw Reinforcement Anchor

- Applied Load: Lc neo trong t gia

khi trt v khi b trt

- Constant: hng s khng ph thuc

vo cc thng s kch thc ca neo

- Variable: bin thin ph thuc vo

vic khai bo kch thc neo

- Nu chn mc F of S Dependent l

YES th APPLIED LOAD phi chu

thm cho h s an ton chung ca mi dc

m phn mm tnh c.

51 DINH XUAN HOAN

11. NNG CAO


Constant Applied Load:

- Ch cn v tng trng neo nhng gc

nghing phi ng. Chng trnh t tnh

ton ra cc chiu di thanh neo v on

ngm sao cho lc neo gi khi t ng

gi tr c khai bo

52 DINH XUAN HOAN

11. NNG CAO


Variable Applied Load:

- Thay i theo cc thng s khai bo

- Bond length: Chiu di phn to ra ma

st gi khi t b trt gn vo khi

t khng b trt, m

- Bond diameter: ng knh ca phn

Bond length (n v l m)

- Bond safety factor: H s an ton ca

lc ma st gia phn Bond length v t

- Bond skin friction: Lc ma st n v

gia phn Bond length v t (KN/m2)

- Anchor spacing: Khong cch gia cc

neo trn 1m di theo phng vung gc

vi mt phng tnh ton

53 DINH XUAN HOAN

11. NNG CAO


Variable Applied Load:

- Bar Capacity: Lc thanh neo c th chu

c

- Bar safety Factor: H s an ton v kh

nng chu lc ca phn Free length

- Shear Capacity: Kh nng chu lc ct

ca phn Free length

- Shear Safety Factor: H s an ton v

kh nng chu lc ct ca phn Free length

- Apply Shear: Lc ct s ct song song

(parallel) vi cung trt Parallel to

slip hay vung gc vi thanh neo (ct)

Perp. To Reinf

54 DINH XUAN HOAN

11. NNG CAO


Tnh ton neo: Lc neo vo trong t gia khi t b trt v khi t trt

gi l APPLIED LOAD v l gi tr Lc Min c xc nh t 2 biu thc:

ingAnchorSpacactorBarSafetyF

yBarCapacitnceBarResista

BondLengthingAnchorSpacFactorBondSafety

ictionBondSkinFr erBondDiametanceBondResist

55 DINH XUAN HOAN

11. NNG CAO

11.5 Gii php gia c vi a k thut

56 DINH XUAN HOAN

11. NNG CAO


57 DINH XUAN HOAN

11. NNG CAO


Thc hin: Draw Reinforcement Fabric

- C 2 iu kin tnh:

- C th khai bo gi tr lc ma st gia

vi a v nn t l mt hng s

- Hoc tnh ton trc tip t cc thng s

a cht ca nn

- Nu chn mc F of S Dependent l

YES th APPLIED LOAD phi chu

thm cho h s an ton chung ca mi dc

m phn mm tnh c.

58 DINH XUAN HOAN

11. NNG CAO


Ma st gia vi vi v t l mt hng

s:

- Mc Bond Skin Friction: nhp lc ma

st n v gia vi v t

- H s an ton ca s tip xc gia vi

v t

- Kh nng chu lc ca 1m vi (KN/m)

- H s an ton ca vi

- Hng ca lc tc dng (0 hng trc,

1 song song vi y lt)

- Lc khng trt n v (F/L)= Lc ma

st/H s an ton gi tr ny nhn vi

chiu di gia c ra lc gi trong vi

59 DINH XUAN HOAN

11. NNG CAO


Tnh ton ma st gia vi vi v t

qua cc thng s t nn:

- Nhp cc gi tr Lc dnh lin h, Phi

lin h, h s lin kt b mt

- Cc thng s cn li ging phn trn

60 DINH XUAN HOAN

11. NNG CAO


S lin h gia cc thng s khai bo:

-Phn mm s tnh ton c th a ra

thng s ngay trn hp thoi

- V d:

Lc ma st= (12x12)/1.0 KN

Lc ko t vi= 200/1.0 KN

Lc gi = Min= 144

61 DINH XUAN HOAN

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Bai Giang Geoslope 2004 Dxh 5.10.2013