What type of slope failure occurs along a curved slip surface in homogeneous clay?

Rotational failure

True or False: Translational failures occur along planar surfaces parallel to slope face.

True

The formula τ = c' + σ' tanφ' represents which type of stress analysis?

Effective stress analysis

For dry cohesionless infinite slope, FS = _____/tanβ

Tanφ'

Multiple Choice: What happens to factor of safety when groundwater rises? A) Increases significantly B) Remains constant C) Decreases due to reduced effective stress D) Doubles in value

C) Decreases due to reduced effective stress

Which method considers interslice normal forces but neglects interslice shear forces?

Bishop's Simplified Method

What is the minimum factor of safety for permanent slopes under normal conditions?

1.5

True or False: Ordinary Method of Slices typically overestimates factor of safety.

False. It typically underestimates factor of safety by 5-20%.

Flow failures commonly occur in which two soil types?

Loose saturated sands and sensitive clays

The stability number Ns relates undrained cohesion to _____ and slope height.

Unit weight

Multiple Choice: Residual friction angle is typically how much lower than peak? A) 2-5 degrees B) 5-15 degrees C) 20-30 degrees D) Equal to peak

B) 5-15 degrees

What does the pore pressure parameter ru equal?

U/(γz)

Scenario: A clay slope shows cracking after 5 years. Which strength should be used?

Residual strength

The horizontal seismic coefficient kh typically ranges from _____ to _____.

0.1 to 0.2

True or False: Bishop's method requires iteration because FS appears on both equation sides.

True

What type of failure involves forward rotation about a low pivot point?

Toppling failure

Multiple Choice: Rapid drawdown creates critical conditions because: A) Water pressure increases B) Soil becomes stronger C) External support removed, high pore pressures remain D) Slope angle decreases

C) External support removed, high pore pressures remain

For infinite slope with seepage parallel to surface, what reduces the friction term?

Submerged unit weight (γ')

The most effective and economical slope stabilization method is usually _____.

Drainage

What is the critical slip surface in slope stability analysis?

The surface with minimum factor of safety

True or False: Wedge failures occur along two intersecting discontinuities in rock.

True

Multiple Choice: For slopes in strain-softening clays, which strength parameter is appropriate? A) Peak cohesion and friction B) Average of peak and residual C) Residual friction angle D) Undrained strength only

C) Residual friction angle

The term mα in Bishop's method equals cosα plus what expression?

(sinα tanφ')/FS

Scenario: A slope has FS values of 1.2, 1.8, and 1.4 for different surfaces. Which controls design?

1.2 (minimum factor of safety)

What does the γ' term represent in submerged slope calculations?

Submerged unit weight (γ - γw)

True or False: Infinite slope analysis applies to deep circular failures in finite slopes.

False. It applies to shallow failures parallel to slope surface.

For total stress analysis in saturated clays, the friction angle φ equals _____.

0 (zero)

Multiple Choice: Janbu's method is most suitable for: A) Circular slip surfaces only B) Non-circular slip surfaces C) Infinite slopes D) Rock slopes only

B) Non-circular slip surfaces

What correction factor does Janbu's method use, typically ranging 1.0 to 1.15?

Fo

The pseudostatic method represents earthquake effects as constant _____ forces.

Horizontal and vertical

True or False: Higher plasticity index correlates with larger peak-residual strength difference.

True

For seismic analysis, minimum acceptable factor of safety ranges from _____ to _____.

1.1 to 1.2

What geometric modification reduces driving forces by decreasing slope angle?

Flattening the slope