Geotechnical Engineering I-Midterm Exam

1.) Geologic map contains what information among the given items below?

i. Mineral & Rock deposits

ii. History and Age of Soil Formation

iii. Extent and Distribution of Rock Formations

iv. Existing Geo-Hazards

• a.) i & ii

• b.) i, ii, & iv

• c.) i, ii, & iii

• d. all of the above

Which among the given choices is the correct order of the procedure for carrying out a Geotechnical Engineering project listed below?

i.) Specific Recommendation

ii.) Working hypothesis

iii.) Supervision

iv.) Site Reconnaisance

v.) Performance monitoring

• a.) iv-iii--i-v

• b.) iv-iii-ii-i-v

• iv-ii-i-iii-v

• d.)iv-ii-i-iii-v

3.) Rock formed as the soil particles settled out from a transporting medium during the deposition

• a.) Sedimentary

• b.) Igneous

• c.) Metamorphic

• d.) Conglomerates

Soil is formed as a result of natural processes. What processes made this possible?

i.) Parent rocks break down to form another rocks of varying properties.

ii.) Rocks undergo wear and tear and carried by transporting medium to form deposits.

iii.) Weather conditions induces reactions to produce minerals depending on the temperature.

iv.) Extreme pressure for a longer time causes soil to be cemented that result to stratification with different particle size distribution and characteristics.

v.) The structural arrangement of particles formed is influenced by the existing geo-hazards.

• a.) i, ii, & iii

• b.) ii, iii, iv, & v

• c.) ii, iii & iv

• d.) all of the above

5.) The behavior of coarse grained and fine grained soil differs significantly, on what ground?

i.) Fine soil has double layer property which made it comparable in strength that of coarse soil.

ii.) Double layer property of fines is the reason for the plasticity property of fines.

iii.) Double layer of clay is removable and exchangeable with the presence of other substances.

iv.) Coarse grained and fine grained have similar parent rocks and deposition history.

v.)These soils have different particle size distribution

• a.) all of the above

• b.) i, ii, iii & v

• c.) ii, iii, & iv

• d.) ii, iii, iv & v

The consequences of the particulate nature of soil are

i.) Deformations in soil is controlled by the strength of interactions between particles

ii.) Presence of water increases the strength of soil at the particle contact

iii.) Water may flow through the soil mass which alter the strength of soil

iv.) Properties of soil is affected by the decrease and increase of moisture content

• a.) i, ii & iii

• b.) i, ii & iv

• c.) i, iii & iv

• all of the above

7.) Formation and properties of alluvial deposits are influenced by

i.) Extreme flooding and precipitations

ii.) Grain size particle distribution

iii.) Climate and hydrological patterns

iv) Disaster mitigation efforts and structural development

• a.) i, ii & iv

• b.) all of the above

• c.) i, ii , & iii

• d.) i, iii & iv

8.) You are ask to evaluate a problematic soil such as alluvial or colluvium soil. Below are the correct report to be made.

i.) Alluvial and colluvium soils are both a by-product of natural disasters.

ii.) Alluvial comes from weathered rocks and Colluvium is formed by soil mass movement.

iii.) Alluvial deposit has uniform particle distribution and Colluvium has complex-varied interlayering of soil.

iv) Alluvial and Colluvium have similar inherent weaknesses such as loose, low strength, and compressible.

• a.) i, ii & iv

• b.) i, ii & iii

• c.) all of the above

• d.) ii, iii & iv

You are tasked to give an observation on the proper behavior of clay soil on a particular project. The appropriate recommendations are

i.) Clay has high potential for swelling

ii.) To improve strength of clay it requires pre-compression to remove the water

iii.) Clay is very compressible and deformable soil

iv.) Clay is easy to compact

• a.) i, ii & iv

• b.) i, ii & iii

• c.) all of the above

• d.) ii, iii & iv

10.) It describes the degree of packing or compactness of the soil particles.

• a.) Void ratio

• b.) relative density

• c.) dry density

• d.) compaction