M3 CONCEPTS Flashcards
1
Q
Laboratory Testing
- Performed on the recovered soil samples to obtain the natural water content of the soil.
- Water content affects the strength of the soil.
A
Water Content
2
Q
Laboratory Testing
- The Liquid Limit (LL) and Plastic Limit (PL) are routinely determined for cohesive soils.
- Plasticity Index (PI) can be computed from LL and PL
PI = LL - PL
* LL is primarily used for consolidation estimates
* PI is commonly used in strength correlations
A
Atterberg Limits
2
Q
Laboratory Testing
- In any soil mass, the sizes of the soil vary greatly.
- Grain-size distribution refers to the proportion of different size particles that make up the soil.
- The grain-size distribution of coarse-grained soil is generally determined by means of sieve analysis.
A
Grain Size Analysis
3
Q
Laboratory Testing
- Measures the maximum compressive stress that the soil sample can withstand before failure.
- Used to determine the strength of cohesive soils, such as clays and silts.
- Used in the design of shallow foundations, slope stability analysis, and estimation of bearing capacity.
A
Unconfined Compressive Test of
Cohesive Soils (UCS)
4
Q
Graphical Contents of
a Soil Investigation Report
A
- A site location map
- A plan view of the boring location plan
- Boring logs
- Laboratory test results
- Other special graphical presentations (idealized soil profile, utility locations, etc.)
5
Q
- The resistance to mass deformation
- It is a combination of particle rolling, sliding, and crushing and is reduced by any pore pressure that exists.
*Measured in terms of two soil parameters: interparticle attraction or cohesion (c) and resistance to interparticle slip called the angle of internal friction (f)
A
Shear Strength
6
Q
- The sand is placed box in a shear box that is split into two halves
- First normal load is applied to the specimen then a shear is applied at the top half of the shear box to cause failure in the sand.
A
Direct Shear Test
7
Q
Triaxial compression tests can be conducted on sands and
clays
A
Triaxial Test
