Final Soils Test

Front 1

the enlarged size of the footing gives increased _______ ____ between the footing and soil

Back 1

contact area

Front 2

what reduces the pressure on soil to allowable bearing capacity for soil

Back 2

enlarged footing size

Front 3

Foundation Design Criteria:

1. _______ properly (horizontal/vertical)
2. safe from _______ ________ failure
3. safe from excessive __________

Back 3

located
bearing capacity
settlement

Front 4

criteria for footing to be located properly (vertical/horizontal)

1. _____ action
2. zone of _________ ____ volume change
3. _________ effects
4. __________ defects
5. ________ buildings

Back 4

1. frost
2. significant soil
3. groundwater
4. underground
5. adjacent

Front 5

-lifting during cold weather
-dropping during warm weather
-footings cannot stand freeze-thaw cycles
-place footing below frost line
-check building code requirements

Back 5

frost action

Front 6

-plastic clays shrink and swell greatly
-greatest change near ground surface
-foundation below volume zone

Back 6

zone of significant soil volume change

Front 7

groundwater is

Back 7

undesirable

Front 8

if there is groundwater, where should you put the footing if possible

Back 8

above groundwater

Front 9

what reduces soil strength

Back 9

groundwater

Front 10

hydrostatic uplift from water

Back 10

groundwater

Front 11

underwater construction is...

Back 11

expensive

Front 12

if there is groundwater, what may be required

Back 12

water-proofing

Front 13

faults, caves, and mines are examples of

Back 13

natural underground defects

Front 14

sewer lines and utility cables are examples of

Back 14

man made undergound defects

Front 15

soils are subjected to (3)

Back 15

compression
tension
shear

Front 16

soils STRUCTURAL strength is primarily a function of the soil's...

Back 16

shear strength

Front 17

the soils ability to resist sliding along the internal surfaces

Back 17

shear strength

Front 18

the soils ability to resist horizontal movement

Back 18

shear strength

Front 19

S=

Back 19

shear strength

Front 20

c=

Back 20

cohesion

Front 21

effective intergranular pressure is ____________ to shear plane

Back 21

perpendicular

Front 22

what are the two shear strength parameters

Back 22

cohesion
angle of internal friction

Front 23

strength between grains is...

Back 23

cohesion

Front 24

cohesion is predominantly in

Back 24

cohesive soils

Front 25

shear strength of a cohesive soil (clay) is related to

Back 25

water content

Front 26

shear strength of a cohesive soil (clay) is related to the type of

Back 26

clay material

Front 27

shear strength of a cohesive soil (clay) is related to previous...

Back 27

overconsolidation pressure

Front 28

angle of internal friction is predominantly in

Back 28

granular soils

Front 29

angle of internal friction is significant for a ___________ soil

Back 29

cohesionless

Front 30

interlocking between particles - sum of sliding friction plus interlocking

Back 30

angle of internal friction

Front 31

sliding friction in a given soil

Back 31

angle of internal friction

Front 32

interlocking by gradation and density

Back 32

angle of internal friction

Front 33

angle of repose for soil is related to

Back 33

angle of internal friction

Front 34

in water, the angle of internal friction is free flowing, so that means it is

Back 34

0

Front 35

water in voids is driven out during construction /loading due to high permeability

Back 35

cohesionless soils

Front 36

there is little effect on shear strength due to soil moisture in

Back 36

cohesionless soils

Front 37

vane test, unconfined compression test, and triaxial compression test are all lab tests for

Back 37

shear strength

Front 38

in UP, P =

Back 38

concentrated load

Front 39

p=

Back 39

vertical stress at a depth

Front 40

z=

Back 40

depth

Front 41

r=

Back 41

horizontal distance

Front 42

failure occurs when a definite ______ ____ appears

Back 42

failure plane

Front 43

failure occurs when a sample has deformed how much

Back 43

15%

Front 44

Mohr's circle is a graphical representation of

Back 44

stress vs strain at failure

Front 45

Mohrs circle is a graphical representation of stress vs strain at what

Back 45

failure

Front 46

the ability of a soil to support a foundation is its

Back 46

bearing capacity

Front 47

a bearing capacity analysis includes

Back 47

shear and settlement failure

Front 48

Qult stands for

Back 48

ultimate bearing capacity

Front 49

the load per unit area to cause shear failure is also known as

Back 49

Qult

Front 50

Qa stands for

Back 50

allowable bearing capacity

Front 51

FS stands for

Back 51

factor of safety

Front 52

after the soil's allowable bearing capacity has been determined you can then determine the

Back 52

size of the footing

Front 53

Nc, Nq, and Ny are functions of the soils

Back 53

angle of internal friction

Front 54

Nc stands for

Back 54

influence from cohesion

Front 55

Nq stands for

Back 55

influence from surcharge

Front 56

Ny is from the soil's ____ ______ and __________ _____

Back 56

unit weight and foundation width

Front 57

if groundwater is at a depth of "B" or greater, assume...

Back 57

no effect from groundwater

Front 58

if water table is at or above the footings base, use the soils _________ ____ ______ for rBNy factor

Back 58

submerged unit weight