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WorksheetsSite Investigations Programme
Total questions: 40
Worksheet time: 20mins
Define and justify the purpose and scope of a site investigation program.
A site investigation program is conducted to assess ground conditions and determine suitability for construction, ensuring safety and cost-effectiveness.
A site investigation program is mainly for designing the building's architecture.
A site investigation program is only necessary for environmental impact studies.
A site investigation program is used to estimate the cost of building materials.
The preliminary phases of a site investigation program include Desk Study and Reconnaissance. Which of the following best describes these phases?
Desk Study involves collecting existing information, while Reconnaissance includes a visual inspection of the site.
Desk Study is a physical survey, and Reconnaissance is a laboratory analysis.
Desk Study and Reconnaissance both involve drilling boreholes for soil samples.
Desk Study focuses on laboratory testing, while Reconnaissance is about interviewing local residents.
Common methods for advancing boreholes and obtaining soil samples include:
Auger drilling, rotary drilling, and percussion drilling
Laser drilling, water jet cutting, and plasma boring
Electromagnetic probing, ultrasonic sampling, and infrared scanning
Thermal melting, chemical dissolution, and magnetic extraction
Which stage in the phased approach involves gathering all existing information with low cost and high impact?
Stage 1: Desk Study
Stage 2: Site Reconnaissance
Stage 3: Preliminary Investigation
Stage 4: Detailed Investigation
What is the main goal of Stage 2: Site Reconnaissance in the phased approach?
Gather all existing information
Observe the site and its surroundings firsthand
General understanding of soil layers and groundwater
Confirm conditions and gather specific engineering data
Stage 3: Preliminary Investigation aims for a general understanding of ________ and groundwater.
soil layers
weather patterns
vegetation types
rock formations
The goal of Stage 4: Detailed Investigation is to confirm conditions and gather specific engineering data.
True
False
What is the purpose of using Geological & Soil Maps in the desk study?
To understand the regional geology and expected soil types.
To determine the cost of construction materials.
To identify the architectural style of nearby buildings.
To estimate the population density of the area.
What do Aerial Photography & Topographical Maps help analyze during the desk study?
Terrain, contours, and surface features.
Chemical composition of soil.
Historical land ownership records.
Local wildlife population.
Why are Services Records important in the desk study?
To locate hidden utilities like cables, sewers, and wires, which is essential for safety.
To estimate the total project cost.
To determine the architectural style of the building.
To select the type of construction materials to be used.
What insight does Data from Nearby Sites provide in the desk study?
Insight into local conditions and potential challenges.
Information about global climate trends.
Details about unrelated industries.
Predictions for future technological advancements.
What is one advantage of the desk study?
Highlights potential problems early
Increases investigation expenses
Makes design less efficient
Provides no context
Core Objectives & Advantages: The desk study provides context that is ______ to obtain on-site.
difficult
easy
quick
cheap
Core Objectives & Advantages: The desk study is highly ______, limiting overall investigation expenses.
cost-effective
time-consuming
risky
complicated
Core Objectives & Advantages: The desk study aids in the ______ design of the physical investigation phases.
efficient
random
delayed
incomplete
What is the main purpose of the reconnaissance stage in a site investigation?
To conduct laboratory testing
To visually assess site conditions
To perform soil stratification
To locate groundwater table
The preliminary site investigation involves opening a few borings or a test pit to establish general soil stratification, identify soil types, and locate the ________ table.
groundwater
dining
temperature
pressure
Which stage uses preliminary data to locate additional borings and determine specific sampling needs for lab testing?
Stage 2: Reconnaissance
Stage 3: Preliminary Site Investigation
Stage 4: Detailed Site Investigation
None of the above
According to the Fundamental Principle, why must borings extend deep enough when determining the zone of influence for a foundation?
To reach groundwater
To penetrate all soil layers significantly affected by the building’s load
To avoid hitting rocks
To save construction costs
Fill in the blank: The depth of investigation depends on the increase in ______ caused by the foundation.
stress (Δσ)
temperature (ΔT)
moisture (ΔM)
pressure (ΔP)
We explore until the point where the foundation’s added stress becomes negligible compared to the existing overburden pressure.
True
False
According to the rule of thumb, the estimated boring depths can and should be adjusted in the field based on what?
the actual subsoil encountered during drilling
the weather conditions on the day of drilling
the type of drilling equipment used
the number of workers present
According to the depth rules for foundations, how deep should an isolated spread footing or raft be placed below the foundation's lowest point?
1.5B
1.5L
2B
2L
According to the rule for retaining walls, D = 1.5 times the width (B) or height (H) of the retaining wall, whichever is ________.
greater
smaller
equal
average
When deep excavations are planned, borings should extend to at least ___ times the depth of the excavation.
1.5
2
1
0.5
If foundations must be transmitted to bedrock, a minimum of ___ of core boring into fresh, unweathered bedrock is required.
1m
0.5m
2m
3m
The depth of boring must be increased if the bedrock is irregular or weathered.
True
False
The investigation for large structures on piles must go deep enough to assess the soil supporting the entire pile group, considering the ________.
combined pressure bulb
pile cap thickness
foundation settlement rate
surface water table
According to the principle, spacing can be increased for which type of subsoil conditions?
Complex and variable
Uniform and predictable
Rocky
Sandy
According to the principle, spacing must be decreased where conditions are ______ or variable.
complex
simple
predictable
uniform
Which technique in detailed site investigation uses trial pits?
Shallow Investigation
Deep Investigation
Geophysical Survey
Borehole Drilling
Which boring methods are used in detailed site investigation?
Auger Boring
Wash Boring
Rotary Drilling
All of the above
Sampling in site investigation can be done using Split Spoon (for SPT) and Thin-Wall/Shelby Tubes.
True
False
Which of the following is NOT an in-situ testing method?
SPT
CPT
Vane Shear Test
Piezometers
Geophysical methods in site investigation include _______ and resistivity surveys.
seismic
magnetic
gravity
electromagnetic
Rock assessment in site investigation involves coring of rocks and ________.
Rock Quality Designation (RQD)
Soil Permeability Test
Water Table Measurement
Grain Size Analysis
Which technique uses piezometers to assess groundwater in site investigation?
Hydraulic Conductivity Test
Piezometric Analysis
Geotechnical Investigation
Groundwater Monitoring
Which layer is directly above the Weathered Shale?
Loose Sand
Stiff Silty Clay
Competent Bedrock
Piezometric Surface
According to the geotechnical ground model, what does stratigraphy refer to?
Stratigraphy refers to the soil and rock layers.
Stratigraphy refers to groundwater flow direction.
Stratigraphy refers to the mineral composition of rocks only.
Stratigraphy refers to the surface vegetation types.
Which of the following is NOT included in the detailed interpretation of the subsurface according to the geotechnical ground model?
A) Stratigraphy
B) Engineering properties of each layer
C) Groundwater conditions
D) Soil fertility
