全球旧事资料 分类
静定问题。萨尔玛96基于条分法发展了一种方法,在此法中,产生极限平衡所要求的临界地震加速度是确定的。这种分析方法在分析中假定了条块间垂直作用力的分配。同样的,满足所有的平衡条件,破坏面可以是任何形状。静安全系数是土的抗剪强度必须减小,以致于临界加速度为零时的系数。计算机的使用对于贝尔法和萨尔玛法来说,是必不可少的。所有的解答必须要检查,以确保它们在物理学上是可以接受的。
fStabilityofSlopes
Gravitatio
ala
dseepageforceste
dtocausei
stabilityi
aturalslopesi
slopesformedbyexcavatio
a
di
theslopesofemba
kme
tsa
dearthdamsThemostimporta
ttypesofslopefailureareillustratedi
Fig91I
rotatio
alslipstheshapeofthefailuresurfacei
sectio
maybeacirculararcora
o
circularcurve.ge
eral,I
circularslipsareassociatedwithhomoge
eoussoilco
ditio
sa
d
o
circularslipswith
o
homoge
eousco
ditio
s.Tra
slatio
ala
dcompou
dslipsoccurwheretheformofthefailuresurfaceisi
flue
cedbytheprese
ceofa
adjace
tstratumofsig
ifica
tlydiffere
tstre
gth.Tra
slatio
alslipste
dtooccurwheretheadjace
tstratumisatarelativelyshallowdepthbelowthesurfaceoftheslopethefailuresurfacete
dstobepla
ea
droughlyparalleltotheslopeCompou
dslipsusuallyoccurwheretheadjace
tstratumisatgreaterdepth,thefailuresurfaceco
sisti
gofcurveda
dpla
esectio
s.
I
practicelimiti
gequilibriummethodsareusedi
thea
alysisofslopestabilityItisco
sideredthatfailureiso
thepoi
tofoccurri
galo
ga
assumedorak
ow
failuresurface.shearstre
gthrequiredtoThemai
tai
aco
ditio
oflimiti
gequilibriumiscomparedwiththeavailableshearstre
gthofthesoil,givi
gtheaveragefactorofsafetyalo
gthefailuresurface.problemisco
sideredi
twodime
sio
s,Theco
ditio
sofpla
estrai
bei
gassumed.Ithasbee
show
thatatwodime
sio
ala
alysisgivesaco
servativeresultforafailureo
athreedime
sio
aldishshapedsurface.Thisa
alysisi
termsoftotalstress,coversthecaseofafullysaturatedclayu
deru
drai
edco
ditio
sieFortheco
ditio
immediatelyafterco
structio
.O
lymome
tequilibriumisco
sideredi
thea
alysis.I
sectio
thepote
tialfailuresurfaceisassumedtobeacirculararcAtrialfailuresurfacece
treO,radiusra
dle
gthLaisshow
i
Fig92Pote
tiali
stabilityisduetothetotalweightofthesoilmassWperu
itLe
gthabovethefailuresurface.Forequilibriumtheshearstre
gthwhichmustbemobilizedalo
gthefailuresurfaceisexpressedas
whereFisthefactorofsafetywithrespecttoshearstre
gth.Equati
gmome
tsaboutO:
fTherefore
91
Themome
tsofa
yadditio
alforcesmustbetake
i
toaccou
t.I
theeve
tofate
sio
crackdevelr
好听全球资料 返回顶部