.
ÍNDICE INTRODUCCIÓN ...................................................................................................2 ...................................................................................................2 OBJETIVOS ...................................... .......................................................... ........................................ ................................. ........................... ................ 3 DEFINICIONES ..................................... ......................................................... ........................................ ............................................ ........................ 4 1.
El Ensa Ensayo yo de Comp Compre resi sión ón Simp Simple le....................................................................4
.
Tipos de de ro ro!"ra............................................................................................6
E#UI$OS % &'TERI'(ES &'TERI'(ES ......................................................................................8 ......................................................................................8 1.
'par para!o a!o de de )o )ompres presió ión* n*................................................................................8
.
E+!r E+!ra) a)!o !orr de m"es m"es!r !ras as ,ina ,inal! l!er erad adas as-* -*..............................................................8
.
&i)róme!ro de de de/orma)ión*.........................................................................9
0. &i)ró )róme!r e!ro de de )ar )ar a*...................................................................................9 2.
Cronóme!ro*................................................................................................9
3.
Balan4a*...................................... .......................................................... ................................................... ............................... ............ 9
$RE$'R'CIÓN DE (' &UESTR' &UESTR'.........................................................................10 $ROCEDI&IENTO...................................... .......................................................... ....................................... ..................................... .................. 11 RESU(T'DOS .....................................................................................................11 .....................................................................................................11 1.
C5l) C5l)"l "loo Del Del Con Con!e !eni nido do De 6"m 6"med edad ad ,7 ,7-. -........................................................11
.
C5l) C5l)"l "loo Del Del 8re 8rea a Corr Corre eid ida a,
.
Cal)"lar (a Cara Cara $...................................................................................12
Aci -..........................................................12
0. Cal) Cal)"l "lar ar El El Es/" Es/"er er4o 4o Com Compr pres esi9 i9o. o. 2.
σc ......................................................12
Cal)"lar (a Resis!en)ia 'l Cor!e o Co:esión ,C- Del S"elo. ...............................13
3. Cal) Cal)"l "loo De De (os (os Es/" Es/"er er4o 4oss.............................................................................13 DISCUSIONES ....................................................................................................15 ....................................................................................................15 CONC(USIONES .................................................................................................15 .................................................................................................15 'NE;OS ....................................... ........................................................... ........................................ ........................................ .............................. .......... 16
Mecánica de Suelos II
1
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INTRODUCCIÓN INTRODUCCIÓ N Toda o
"e re>"erir5n las es!r")!"ras dependen de al"nos /a)!ores )omo el !ipo de s"elo? los asen!amien!os permisi"e !ienen "na amplia e+perien)ia ad>"irida en es!e )ampo? ya >"e de"e es impres)indi"e "n es!"dian!e y /"!"ro eresado de inenier=a )i9il !ena el )ono)imien!o de es!os !emas y p"eda in!erpre!arlos en /a9or de s" "e permi!e o
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OBJETIVOS De!erminar la resis!en)ia a la )ompresión no )on/inada ( σ ) de "n s"elo >"e se en)"en!ra
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DEFINICIONES DEFINICIONE S 1. E E NS!"O C OM#RESIÓN S IM#E NS!"O DE DE C OM#RESIÓN S Es!e es "n ensayo >"e se reali4a a "na m"es!ra de s"elo inal!erada a la )"al se le apli)ara "na )ara a+ial? !iene por /inalidad? de!erminar la resis!en)ia a la )ompresión? de "n )ilindro de s"elo )o:esi9o o semi)o:esi9o? e indire)!amen!e el )on!enido de :"medad y )o:esión. En el ensayo de la )ompresión simple? en el )"al solamen!e se le apli)a a la pro"ipo. El se" se"nd ndo? o? re>" re>"ie iere re ir real reali4 i4an ando do in)remen!os de )ara? lo >"e p"ede )a"sar errores en las de/orma)iones "ni! "ni!ar aria iass al prod prod") ")ir irse se "na "na )ar )ara a adi)ional de impa)!o al a"men!ar la )ara. El ensayo de )ompresión simple no )on/inada )on/inada en ar)illas ar)illas rela!i9ame rela!i9amen!e n!e impermea"e se indi)a a )on!in"a)ión. Figura 1. Ensayo de
SeAn el 9alor de la resis!en)ia m5+ima a )ompresión simple? "na ar)illa se p"ede )lasi/i)ar del modo >"e se indi)a en la !a
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Tabla T abla n01
Consis,encia &"y
Ca%'a -l -l,ia $*'/c0+
?2 ?2?2 ?21? 1?? Co(esi2n ?0? $*'/c0+ D"ra%3'ida 0? !%cilla .2 !%cilla sei%%3'ida .1 !%cilla 4landa .1 !%cilla a%enosa .2 lio %3'ido o T du%on02 Tabla abla .
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0.
T I#OS DE DE ROTUR! ROTUR!
C"ando se reali4a "n ensayo de )ompresión simple no )on/inada se p"eden prod")ir 9arios !ipos de ro!"ra? de los )"ales !enemos la ro!"ra 5%á'il y y la ro!"ra d-c,il . En la primera primera eneralmen!e eneralmen!e se oriinan oriinan rie!as paralelas paralelas a la dire))ión dire))ión de la )ara? es de)ir son de manera loni!"dinal? y la ro!"ra o)"rre de "n modo "eGas? presen!5ndose desp"@s de ella "na )a=da de la resis!en)ia. En la se"nda /orma de ro!"ra se limi!a a de/ormarse? sin >"e apare4)an 4onas de dis)on!in"idad en ella. De !al /orma >"e? la ro!"ra se prod")e a !ra9@s de "n plano in)linado? apare)iendo "n pi)o en la resis!en)ia y "n 9alor resid"al. SeAn in9es!ia)iones se di)e >"e Hen ar)illas "e en s"elos )emen!ados se s"ele reis!rar ro!"ra /r5il en es!e !ipo de ensayos. (as !eor=as de ro!"ra /r5il /"eron ini)iadas por !llan por !llan 6%i55i,( en 6%i55i,( en 1? el )"al nos di)e >"e Hal a!ri<"ir la red")ida resis!en)ia a la !ra))ión de m"):os ma!eriales a la presen)ia de dimin"!as /is"ras en s" in!erior? en )"yos e+!remos se prod")e )on)en!ra)ión de !ensiones. (a ro!"ra se prod")e de"e por los e+!remos lo impide la /ri))ión en!re el s"elo y las pla)as de )ara. (a )"r9a es/"er4ode/orma)ión "ni!aria se di<"a para o
∆L … … … … … … … … (1 ) L0
D2nde7
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Figura 2. "ur#a "u r#a es$uer%o&de$ormación de
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1
! #!R!TO #!R!TO DE DE COM#RESIÓN COM#RESIÓN 7
El apara!o de )ompresión es!5 )on/ormado por "n anillo de )ara >"e es!5 /iado al mar)o me!5li)o el )"al !endr5 adem5s "na )ons!an!e M1.33? es!e !am"e es!ar5 )one)!ado )on "n !ornillo >"e se "sa para )on!rolar las de/orma)iones apli)adas a la m"es!ra de s"elo
Figura 2. '()uina de
0 E 9TR!CTOR $ IN!TER!D!S +7 9TR!CTOR DE DE MUESTR!S MUESTR!S $ (as )ondi)iones en el momen!o de la e+!ra))ión de la m"es!ra p"eden indi)ar la
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:
M ICRÓMETRO ICRÓMETRO DE DE DEFORM!CIÓN 7
El indi)ador de de/orma)iones de"e )"mpla es!os re>"erimien!os.
ICRÓMETRO DE DE C!R6! C!R6!7 ; M ICRÓMETRO
Es "n ins!r"men!o ade)"ado para medir las los 9alores de )ara apli)ados al esp@)imen de s"elo.
< C RONÓMETRO7 Un ins!r"men!o de medi)ión de !iempo? >"e indi>"e el !iempo !rans)"rrido )on "na pre)isión de 1 se para )on!rolar la apli)a)ión de de/orma)ión pres)ri!a an!eriormen!e.
= B !!N>!7 (a
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#RE#!R!CIÓN DE ! MUESTR! MUESTR! 1. Dim Dimensi ensioones nes de la pro pro"e manearlas )on ran )"idado para e9i!ar s" al!era)ión? )am"e el disposi!i9 disposi!i9oo de e+!ra))ión e+!ra))ión p"eda p"eda daGar daGar la m"es!ra? m"es!ra? p"ede :endirse el !""eGos para /a)ili!ar la e+!ra))ión de la m"es!ra sin al!erarla. al!erarla. 2. C"ando los e+!remos de la pro"edan irre"lares de"eGos a"eros )on s"elo de los )or!es.
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#ROCEDIMIENTO #ROCEDIMIEN TO 'linear )"idadosamen!e la m"es!ra en la m5>"ina de )ompresión. Si los e+!remos no son per/e)!amen!e perpendi)"lares al ee del esp@)imen. Es!a"ipoP es de)ir en el mi)róme!ro de )ara y en el mi)róme!ro de de/orma)ión. ("eo se ir5 a"men!ando la de/orma)ión en el mi)róme!ro de de/orma)ión de !al manera >"e se :aan )in)o de/orma)iones de .2 mm ,es!as de/orma)iones ser5n a)"m"la!i9as-P se"iremos a"men!ando la de/orma)ión pero a:ora se reali4ara )in)o de .1 mmP el res!o ser5 de . mm? :as!a >"e /alle la m"es!ra de s"elo.
RESUT!DOS 1. C ?CUO D E C ONTENIDO @ UMED!D ONTENIDO D E @ UMED!D $A+. En m"es!ras inal!eradas? se o
Dónde*
( )=
W w W s
( )
…………………… 2
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. W w = W m− W s=23.96 gr w ( )=
w
W w W s
× 100=
23.96 123.62
× 100 =19.38
( )=19.38
ORRE6ID! $ 0. C ?CUO D E ? RE! C ORRE6ID!
A ci
+
$ara "na )ara apli)ada dada. A ci =
A0 1
−ε i
… … … … … … … …(3 )
Dónde* A 0
* 8rea !rans9ersal media ini)ial de la m"es!ra ,mm -
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;. C !CU!R E E SFUER>O C OM#RESIVO OM#RESIVO.
σ c
Con !res )i/ras sini/i)a!i9as o )on "na pre)isión de 1 $a ,.1 Q)m-? para )ada )ara de in!er@s. σ c =
P … … … … … … … … (5 ) Ac
Dónde* $* Cara apli)ada , A c
* 8rea !rans9ersal )orreida ,)m-
<. C !CU!R ! R ESISTENCI! ! C ORTE O $C+ D E ORTE O C O@ESIÓN O@ESIÓN $C+ S UEO UEO.
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Diagrama Esfuerzo- Deformacion 1.8 1.6 1.4 1.2 1.0 Esfuerzo σ , Kg/cm2
0.8 0.6
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DISCUSIONES DISCUSIONE S 1. (a presi presión ón la!er la!eral al es i"a i"all a )ero )ero?? y a"n> a"n>"e "e es!o es!o p"ed p"eda a sin sini/ i/i) i)ar ar "na impre)isión? en realidad se o"e la presión la!eral de )on/inamien!o ay"da al s"elo a resis!ir la )ara? y al no e+is!ir es!5 el 9alor o"e dea al ineniero )on "n maren de se"ridad adi)ional. . El ra/i)o ra/i)o es/"er4o es/"er4ode de/or /orma) ma)ión ión o"e si el es/"er4o "l!imo o de ro!"ra? ya >"e desp"@s de llear a es!e 9alor? la resis!en)ia )ae
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2.
El )on!enido de :"medad >"e se o
3. Se o
!NE9OS
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'ues,ra seca despus de