shear box experiment result

8/17/2019 Shear Box Experiment Result

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Result:

Shear Box Inside Diameter : 0.06m

Area (A) : 0.0036m2

Shear Box Height : 0.02m

Specimen : Sample A

oading : 3.! "g

#ormal $eight : 33.3%!# #ormal Stress& r n : '.26% "#m2

ime *lapse

ime

Hori+ontal

dial reading

Hori+ontal

Displacement

t x 0.0,

oad dial

reading

Hori+ontal

shear -orce&

("#)

Shear

Stress& Ʈ

("#m2)

,0 ,0 ' 0.0' ! /.! 2,/

20 ,0 ,6 0.,6 !.% .2 2!%030 ,0 2! 0.2! % '. 2//2

!0 ,0 3, 0.3, %.% ,0./ 2''!

%0 ,0 !0 0.!0 6 ,,./6 326/

60 ,0 !' 0.!' 6 ,,./6 326/

/0 ,0 %/ 0.%/ 6 ,,./6 326/

Specimen : Sample B

oading : %.! "g

#ormal $eight : %2.'/!# #ormal Stress& r n : ,!./,! "#m2

ime *lapse

ime

Hori+ontal

dial reading

Hori+ontal

Displacement

t x 0.0,

oad dial

reading

Hori+ontal

shear -orce&

("#)

Shear

Stress& Ʈ

("#m2)

,0 ,0 ,0 0.,0 % '. 2/22

20 ,0 , 0., %.% ,0./ 2''!

30 ,0 2! 0.2! 6 ,,./6 326/

!0 ,0 33 0.33 / ,3./2 3,,

%0 ,0 !, 0.!, / ,3./2 3,,

60 ,0 %0 0.%0 /. ,%.2 !2!/

/0 ,0 % 0.% ,%.6 !3%60 ,0 66 0.6 ,%.6 !3%6

'0 ,0 /% 0./% ,%.6 !3%6

Specimen : Sample 1

oading : 6.! "g


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#ormal $eight : 62./!# #ormal Stress& r n : ,/.!!0 "#m2

ime *lapse

ime

Hori+ontal

dial reading

Hori+ontal

Displacement

t x 0.0,

oad dial

reading

Hori+ontal

shear -orce&

("#)

Shear

Stress& Ʈ

("#m2)

,0 ,0 / 0.0/ 6 ,,./6 326/20 ,0 ,% 0.,% / ,3./2 3,,

30 ,0 23 0.23 ,%.6 !3%6

!0 ,0 3, 0.3, ' ,/.6! !'00

%0 ,0 3 0.3 ' ,/.6! !'00

60 ,0 !/ 0.!/ '.% ,.62 %,/2

/0 ,0 %/ 0.%/ ,0 ,'.6 %!!!

0 ,0 6% 0.6% ,, 2,.%6 %''

'0 ,0 /3 0./3 ,, 2,.%6 %''

,00 ,0 2 0.2 ,, 2,.%6 %''


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Discussion

he shear strength o- a soil is its resistance to shearing stresses. It is a measre o- the

o- the soil resistance to de-ormation 4 continos displacement o- its indi5idal soil

particles. Shear strength in soils depends primaril4 on interactions eteen particles.

Shear -ailre occrs hen the stresses eteen the particles are sch that the4 slide or roll

past each other. In this experiment& soil deri5es its shear strength -rom the cohesion and

-rictional resistance eteen the soil particles.

rom the tales ao5e& e can see that normal stress (7)& the -orce hich applied

5erticall4 to the soil specimen is held constant -or each loading. or loading 3.!"g& its

normal stress& r n is '.26% "#m28 -or loading %.!"g& its normal stress& r n is ,!./,! "#m

28

-or loading 6.!"g& its normal stress& r n is ,/.!!0 "#m2. $hile& shear stress& the -orce

hich applied hori+ontall4 to the soil specimen is "eep increasing ntil -ailre occr.

rom the graph o- shear stress against hori+ontal displacement& e can see that as the

shear stress is also groing larger as the loading increased.

In 9ohr1olom

a& the relationship

eteen normal stress

and shear stress is

gi5en as Ʈ; c < 7 tan=.

$here& cohesion (c)& is

a measre o- the -orces

that cement particles o-

soils. $hile& internal -riction angle (=) & is the measre o- the shear strength o- soils de

to -riction. rom the graph o- shear stress against normal stress& e "no that the

cohesion (c) -or the soil specimen is ,6%0 "#m2 and the internal -riction angle (=) is !>.

Hence& the 9ohr1olom e?ation -or this experiment is Ʈ; ,6%0 "#m2 < 7 tan!>.

here are some possile error that ma4 occrred a--ecting the accrac4 o- the

experimental reslt. irstl4& it ma4 ecase o- the instrmental error. @ero error in the dial

gage shold e set at +ero e-ore starting the experiment as it ma4 a--ect the experiment

readings. Secondl4& parallax error ma4 occrred. $hile ta"ing the reading on the dial


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gage& the e4es positions shold e perpendiclar to the scale o- dial gage to otain a

more precise reading. 9oreo5er& hman limits ma4 e another reason casing the error

occrred. his happened hen the ones ho reading the stopatch& reading the dial

gage and recording the reslts are di--erent. 9essage trans-erring process and the

reaction o- the stdents is the -actor contriting the errors. hs& the experiment shold

e carried ot at least three times to redce the errors.

Conclusion

In conclsion& hen hori+ontal displacement increased& the shear stress ill also

increased. Besides that& as the loading increased& the shear stress experienced 4 the soil

specimen ill also increased. Shear stress o- the soil specimen is directl4 proportional to

its normal stress. he larger the normal stress applied on the soil specimen& the larger the

shear stress ndergoes 4 it.


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References

, rinciples o- Direct Shear est & 1hap /.! o- *xperimental Soil 9echanic 2 Bardet& C. .& *xperimental Soil 9echanics& ,''/& renticeHall& pper Saddle

Ei5er& #e Cerse4.

3 Detailed description o- Direct Shear est & 1hap /.% o- *xperimental Soil

9echanic Bardet& C. .& *xperimental Soil 9echanics& ,''/& renticeHall& pperSaddle Ei5er& #e Cerse4.

! Detailed description o- Direct Shear est ith photos and an example data

*ngineering roperties o- Soils Based on aorator4 esting& *xperiment ,,:1onsolidation& ro-. Frishna Eedd4& I1

% Direct Shear est on $i"ipedia

6 A Simple echni?e -or Determining the Shear Strength o- ineGrainednsatrated Soils sing the 1on5entional Direct Shear Apparats& C.C. ane& S.F.

anapalli. 2002. 2nd 1anadian Specialt4 1on-erence on 1ompter Applications in

Geotechni?e& $innipeg& pp. 2!%2%3.

/ 1ontinos ailre State Direct Shear ests&A. isa&,'!. Siss ederal Institte

o- echnolog4& @rich& Sit+erland. Eoc" 9echanics and Eoc" *ngineering ,/& 3'%. Springererlag.
http://gees.usc.edu/ce467/Book/Sections/Experimental%20Soil%20Mechanics%20-%20Section%207-4.pdfhttp://gees.usc.edu/ce467/Book/Sections/Experimental%20Soil%20Mechanics%20-%20Section%207-5.pdfhttp://gees.usc.edu/ce467/Book/Sections/Experimental%20Soil%20Mechanics%20-%20Section%207-5.pdfhttp://gees.usc.edu/ce467/Book/Sections/Experimental%20Soil%20Mechanics%20-%20Section%207-5.pdfhttp://www.uic.edu/classes/cemm/cemmlab/Experiment%2012-Direct%20Shear.pdfhttp://www.uic.edu/classes/cemm/cemmlab/Experiment%2012-Direct%20Shear.pdfhttp://en.wikipedia.org/wiki/Direct_shear_testhttp://by.genie.uottawa.ca/~vanapall/papers/conference/2002/Lane_sai2002.pdfhttp://by.genie.uottawa.ca/~vanapall/papers/conference/2002/Lane_sai2002.pdfhttp://www.igt.ethz.ch/resources/publications/180/papers/56/84-1.pdfhttp://gees.usc.edu/ce467/Book/Sections/Experimental%20Soil%20Mechanics%20-%20Section%207-5.pdfhttp://gees.usc.edu/ce467/Book/Sections/Experimental%20Soil%20Mechanics%20-%20Section%207-5.pdfhttp://www.uic.edu/classes/cemm/cemmlab/Experiment%2012-Direct%20Shear.pdfhttp://en.wikipedia.org/wiki/Direct_shear_testhttp://by.genie.uottawa.ca/~vanapall/papers/conference/2002/Lane_sai2002.pdfhttp://by.genie.uottawa.ca/~vanapall/papers/conference/2002/Lane_sai2002.pdfhttp://www.igt.ethz.ch/resources/publications/180/papers/56/84-1.pdfhttp://gees.usc.edu/ce467/Book/Sections/Experimental%20Soil%20Mechanics%20-%20Section%207-4.pdf

shear box experiment result

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