WorksheetsGroundwater_Control_HNC_U17
Total questions: 15
Worksheet time: 8mins
What is groundwater?
Water held in soil in a non-saturated form
Water found in rivers and lakes
Water that evaporates into the atmosphere
Water used for irrigation
What does the water table represent?
The surface of a lake
The change of water content in soil
The depth of a river
The amount of rainfall in an area
What is a method to keep groundwater out permanently?
Sump pumping
Sheet piling
Well point systems
Electro-osmosis method
What is one of the provisions for water-tightness during construction?
Electro-osmosis method
Shallow or deep-bored wells
Diaphragm walls
Horizontal ground water control
What is the usual mixture ratio of cement and sand in cement grout?
1:2
1:3
1:4
1:5
Which chemical can be used to form a gel in grouting to increase soil strength?
Sodium silicate
Calcium carbonate
Magnesium sulfate
Potassium chloride
What is the function of the pump facilities in the grouting process?
To mix the grout
To control the injection of cement grout
To dry the grout
To color the grout
What must be considered before designing the method of works for basement construction?
Color of the walls
Sub-soil condition
Type of paint
Number of windows
What is the purpose of lattice beams in basement construction?
To span between diaphragm walls
To provide lighting
To enhance aesthetics
To increase temperature
What is a key factor in the method of constructing an ordinary basement?
Proper support of cut-off walls
Use of concrete as retailing wall
Ordinary basement floor installation with no holes
Using the anchor same time as dewatering
What is the main purpose of using lattice beams or steel trusses?
To act as propped cantilevers
To provide insulation
To enhance the stability of poured foundation
To increase visibility
What is the purpose of carrying out excavation in stages?
To expose diaphragm walls
To increase speed
To reduce costs
To enhance aesthetics
What is the main structural element used to support the walls in the centre basement slab method?
Earth berm
Steel beams
Wooden planks
Concrete blocks
What is the final construction element in the centre basement slab method?
Lowest basement floor slab
Roof
Windows
Doors
What is essential for construction planning in a congested underground environment?
Accurate construction planning and spatial design
Quick construction without planning
Random placement of materials
Ignoring safety measures
