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CHUYEN E THI CONG HO
AO
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Sng th4: Tng quan vcc bin php thicng ho v cc dng sc.
Chiu th4: Cc yu tnh hng n chuynvtrong ho.
Ti th4: Cc v dlin hvi cc bi ton chc t.
:trt tri y ho. Chiu th5, sng th6, chiu th6: Sinh vin
tnghin cu 4 bi ton chc t v vit thuhoch vho su. NP THU HoCH TRC KTHI HC K.
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Mc tiu thi cng ho C ththi cng o t n cao thit
kcui cng. Khng c st l, khng c scln.
uy n v ngang c a t ng n n t. Ln ca t nn l t nht. nh hng n cng trnh ln cn l t
nht
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4/105
Cc bin php thi cng
Bin php thi cng o hthng dng. Phng php topdown. . Thi cng ng dng p lc nc.
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Cc kt cu ho cn thit k Tng chn t Kch thc v di,
Thp. BTCT ti ch. BTCT c sn.
Gcc loi. Vng chng, h.
Thp. G. BTCT,
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Bin php o h
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Phng php topdown
5/19/2018 Chuyen de Ho Dao Sau
10/105
Phng php updown
5/19/2018 Chuyen de Ho Dao Sau
11/105
Phng php sdng p lc nc
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Cc dng scho c ging n nh trt tng th,
Mt n nh y do trt tri y tri, Xi ngm, ra tri cc ht mn, phun tro, , cng ca tng chn, Chuyn vqu mc ca tng chn,
Ln ca t nn qu mc, Chuyn vngang ca t nn qu mc, Chn ng n cng trnh xung quanh,
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n nh tng th
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y tri y
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t c xu hng nra sau khi o dt pha trn. Nguyn nhn l do p lcthng ng gim. Hin tng ntri ny
khng gy nguy him cho ho. Mt khc, t 2 bn ho tc dng lny hnhl mt gia ti lm cho t di
mt mng btrt sang ph n y h o, hu qul y ho by tri ln.Hin tng ny rt nguy him c bit l
trong iu kin t yu, c thlm mt nnh y h.
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Xi ngm, ra tri cc ht mn
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Hhng vng chng Bin dng 1
vng chngstruynni lc
chng bncnh, cuicng dn
n phhy tonh.
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Khnng chu un ca tng
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23/105
Chuyn vngang ca tng khi H khc nhau
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Chiu su ti hn o t theo phn tch ca phn mmsage script
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Chuyn vqu ln ca tng
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Chuyn vqu ln ca tng chn c thgy ra
chuyn vmng ca cc cng trnh ln cn; lnguyn nhn lm nn t bln; lm cho ntmt ng v cc cng trnh ngm bn cnh.
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Hmc nc ngm
Hmc nc ngm lm tng ng sut hiu qutrong t yu, m hu qucui cng l ln ckt.
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Chuyn vt v tng chn ho Vaterland - Oslo
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Cc yu tnh hng nchuyn vtrong ho
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Sc khng ct khng thot nc ca t,Cu, Chiu su ho,H
Chiu rng ho, B su ngm ca tng cdi y
m ng, Chiu su n tng t cng, T cng tng c,EI
Khong cch ca cc vng chng, Tay nghcng nhn
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nh hng do thay i sc khng ct
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Hsan ton Terzaghi
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34/105
nh hng ca su ho ln chuyn v
tng chn
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nh hng ca brng ho
n chuyn vtng
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nh hng ca brng ho
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Chiu su n tng t cng, T
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nh hng ca chiu dy t yu T/B
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cng tng c,EI
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Sthay i ca moment un theo cc giai on thi cng
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nh hng ca moment v cng tng c.
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Kh h h
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Khong cch ca cc vng chng,
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h h hi
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nh hng chiu su ngm
ca tng cvo nn t, D
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Khi chiu su ngm n tng t cng
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Khi chiu su ngm n tng t cng.
C larsen
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Clarsen
Tng barrett
Trng hp c larsen D=30M
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g p c a se 30
nh hng ca hnh dng h o B/L
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nh hng ca hnh dng ho B/L
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Tay ngh v kinh nghim thi cng
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Tay nghv kinh nghim thi cng Tay nghca nh thu ng vai tr rt ln trong vic
m bo an ton, cht lng trong qu trnh thi cngtng chn cng nhslm vic ca tng csau
ny. Sau y l mt skhuyt tt thng gp: Thi cng tng chn khng thng hng, nghing so viphng thng ng lm cho vic tip xc gia tng v
.
cc b, lan truyn thnh ph hoi ton h. Mt phng khung ging khng vung gc vi phngthng ng ca tng, pht sinh lc lm cho hgingtrt ra khi vtr thit k.
Sai st do lch tm ca cc thanh hchng , khngcng nm trong mt phng. iu ny dn n vic xuthin cc ni lc lch tm, lm cho lin kt bph hy, t dn n sp ton h.
Cht lng thi cng mi ni khng c quan tm ng
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g g g q gmc. Cc mi ni (buloong, hn) ssi, khng ctnh ton, khng c nghim thu. Nhiu khi quan niml mi ni tm sao cho dtho gsau ny. Kinh nghimsp cu cn thcho thy cng tc qun l cht lngcng tc tm cng phi c coi nhcc cng tc thi
cng chnh: phi c thit k, phi c nghim thu thnghim, vt liu tayngheef cng nhn phi c kimsot.
Vt liu thi cn sdn nhiu ln, bcon vnh, nmn.. d n n khnng chu lc khng nhban u,
tuy nhin khng c n vthi cng, gim st nh ging mc. Khng quan trc hoc khng xl cc sliu quan trc
nhn nh kp thi vsc, t c bin php khc
phc. Khng c hiu bit y vng xca t nn gmt v nc trong t xung quanh tng chn t.
nh hng o trc khi lp ging
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nh hng o trc khi lp ging
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n nh trt tri y ho Terzaghi
(1943) Bjerrum vEide (1956)
Eide vnhm(1972)
Goh (1996)
V d trt tri ca Bjerrum and Eide
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V dtrt tri ca Bjerrum and Eide
Phng php terzaghi (1943)
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Phng php terzaghi (1943)
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65/105
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Gii hn v phm vi p dng
Cho ho rng v di, Cha xem xt ti chiu su ngm ca tng
Cha xem xt n hnh dng ca ho, Cha xem xt n cng ca tng c,
Phng php Bjerrum v Eide (1956)
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Phng php Bjerrum v Eide (1956)
5/19/2018 Chuyen de Ho Dao Sau
69/105
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Gii hn v phm vi p dng
Cho ho hp, Cha xem xt n chiu su ngm ca tng
,
Cha xem xt n chiu dy ca lp t ntng t cng,
Cha xem xt n cng ca tng c.
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Eide v nhm (1972)
5/19/2018 Chuyen de Ho Dao Sau
72/105
Cng thc sa i ca Eide v nhm 1972
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Gii hn v phm vi p dng,
Cho ho hp, Cha xem xt n chiu dy ca lp t n
,
Cha xem xt n cng ca tng c.
Phng php ca Goh (1994)
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75/105
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u khuyt im ca phng php Goh
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Chp dng cho ho di,L>>B Chp dng cho ho rng,B/H>1 Chp dng cho Cu khng i,
Khng bit p dng Cu no nu Cu thay i, xem xt n chiu su ngm ca tng
cvo t, D
xem xt chiu su n tng t yu, T xem xt n cng ca tng c, EI
Cha xem xt n hnh dng ca ho L/B Trng hp tng cng n tng t yuD=T khng r,
Cha xem xt n trt bn trong tng c,
So snh cc phng php
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tin cy ca php tnh hsan ton?
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Sc khng ct khng thot nc (Cu1 & Cu2) Khi lng ring () Ti trng gia ti (qs) v brng gia ca gia ti (Bs)
Hsan ton cho php?
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Sliu thc t
Sliu tphn mm
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Xl y ho chng y tri
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84/105
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85/105
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n nh y
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ti clarke(Shirlaw vnhm 2000)
H santon khikhng xlbm va:0.45 0.6
Phng php phn thu hn - Dm trn n-gi ta
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88/105
5/19/2018 Chuyen de Ho Dao Sau
89/105
Phng php phn thu hn
5/19/2018 Chuyen de Ho Dao Sau
90/105
bn khng gian lin tc
Gii hn phn tch li ?
5/19/2018 Chuyen de Ho Dao Sau
91/105
Hoc?
5/19/2018 Chuyen de Ho Dao Sau
92/105
Lm thno c kt qutnh ton tt nht?
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93/105
Cc th nghim khng thot nc.
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Nhng yu tcha chc chn
h
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vho su.
iu kin a cht,
Ti gia cng
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Ti gia cng, Cc nm trong hmng, Mng ca cc cng trnh ln cn,
Hiu ng 3-D, Trnh tthi cng:
Thi cng tng,
Thi cng vng chng, ng lc tng kch, Phun va,
Mc chm tr, Nng lc, tay ngh,
Quan trc trong thi cng ho su.
Mc tiu
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Mc tiu kim tra, nu ho trong tnh trng nguy himca sc,
kim tra cc tiu ch kthut c m bo haykhng,
kim tra hiu qucc phng n khc phc,,
trnh cc khiu kin khng mong mun. Cc loi quan trc: Bin dng tng
o nghing trn tng,
o nghing trong t, o c trn u c,
Lc trong vng chng:
Kch ti vis
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Kch ti vis, ng hchn ng, ng hnhit,
Ln ca nn t: im trc c, Tm o ln trong t,
uy n v c c c ng r n n c n:
im trc c o chuyn vngang v ng Tm o nghing, Thc o vt nt,
Mc nc ngm: ng thm mc nc ngm,
Khc:o moment un ca tng,p lc nc lrng,trt tri, chuyn v- chn ng cng trnh hm.
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Tn sut quan trc
Cn kim tra ton b cng trnh ln cn trc
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Cn kim tra ton bcng trnh ln cn trckhi khi cng cng trnh, Cc vt nt trn tng, mi n, hthng cp thot
nc, va h. nghing ca tng, ct ln tng v ln lch,
Khi c th, o 3 ln cho tt cyu t.
Trong qu trnh o t v xy dng tng hm,tn sut quan trc phthuc vo kch cdn,iu kin a cht v snhy cm ca cc cng
trnh ln cn. Nhiu quan trc c thc hin 1-2 ln 1 tun.
Quan trc thm ngay sau khi o t xong
tng giai on v sau khi tng ti vngchng v tho d vng chng
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tng giai on, v sau khi tng ti vngchng v tho dvng chng. Sau khi thi cng phn ngm, tip tc quan
trc t nht l 6 thng hoc cho n khicc gi trquan trc bt u n nh.
cc gi tr. Trong nhiu trng hp gitro 2
phng A,B c thc sdng o
bin dng ca tng c.
Bin dng ca tng theo cc giai on o t
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Tc thay i chuyn vkhi o
5/19/2018 Chuyen de Ho Dao Sau
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ti thu hoch
5/19/2018 Chuyen de Ho Dao Sau
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Anh chnhn thc c g vho sutrong iu kin t yu qua chuyn vaqua. Vn dng cc kin thc hc v
qua bo ch.) xy dng cho mnh ccnguyn tc khi tnh ton v thi cng ho su.
TI LP TCXD-06
5/19/2018 Chuyen de Ho Dao Sau
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Anh chthu thp cc ti liu quan trc mtvi cng trnh thi cng ho su c schoc khng c scphn tch v
ca chuyn . Qua anh,chc kt cho mnh mt vikt lun khi thi cng ho su.