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التمرين الاول للضغط الجانبي

KAFRELSHEIKH UNVERSITY                                                                          3rd Year Civil

FACULTY OF ENGINEERING                                                                              2011/2012

DEPATMENT OF CIVIL ENGINEERING                                                              First Term

SOIL MECHANIS (2)

 


·         ATTEMPT ALL QUESTIONS.

·         ANY MISSING DATA CAN BE ASSUMED.


SHEET NO. 1

EARTH PRESSURE


Q 1-       Plot the relation between the movement of the wall and the coefficient of earth pressure?

Q 2-       State the main assumption of Rankine theory for earth pressure?.

Q 3-       Explain the effect of the following in the active earth pressure for any wall: 

a) Water Table.        b) Concentrated Load.      C) Surcharge.

Also explain the relation between the earth pressure stress and angle of shear resistance?

Q 4-       Plot the distribution of the earth pressure acting in the given walls as in Fig. (1). Find the total acting forces and point of application of the lateral forces on each structures and comment in your results. Water level at 3.0 m below the ground surface.

Q 5-       A retaining wall with smooth back retains soil of a depth 5.0 m, which has the following properties; ? = 18.50 KN/m3, C = 18 KN/m2, and ? = 12o. The water table level at 1.0 m below the ground surface. Calculate the depth of tension crack and resultant active thrust when:

·       The top surface is unloaded.

·       The top surface is loaded by surcharge of 30 KN/m2.

Q 6-       Comupute the active, passive and at rest earth pressure for sand having a unit weight of 17.5 KN/m3 and ? = 35o. The sand is placed behined a bridge a butment that is 6.0 m high. Draw the pressure diagrams for each condation, and find the resultant.

Q 7-       A 6.0 m tall cantilever wall retains a soil has the following properties;?  = 1.92 t/m2, C = 0.0, and  ? = 30o. the ground surface is inclined behind the wall at a slope 3:1above the horizontail. Determine the normal and shear forces acting on the back of this wall using Rankine's.

Q 8-       Find graphically the max. active  and passive earth pressure behined the retaining wall in Fig.(2) .

Q 9-       For the given retaining wall in Fig. ( 3 ) compute the distribution of earth pressure stress acting on the wall in case wall move inward and outward of backfill.

Q 10-  An unsupported vertical cut 3.0 m in depth is to be made in stiff clay having a following properties; ? = 18.50 KN/m3, C = 18 KN/m2. Find the factor of safety of the cut.





 







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